Heads up: There are no amended sections in this chapter.
SCOPE

Part 6 applies to escalators and moving walks used to transport passengers.

NOTE: See also Part 8 for additional requirements that apply to escalators and moving walks.

Floor openings for escalators shall be protected against falls, the passage of flame, heat, and/or smoke in accordance with the provisions of the applicable building code (see Part 9).
The sides and undersides of an escalator truss or group of adjacent trusses in a single wellway shall be enclosed in materials defined as either noncombustible or limited-combustible by the building code or NFPA 101, whichever is applicable (see Part 9). Means provided for adequate ventilation of the driving machine and control spaces, when included in the truss enclosure area, shall be permitted.
The angle of inclination shall be designed not to exceed 30 deg from the horizontal, but due to field conditions at the site shall be permitted to exceed this maximum by 1 deg. The angle shall be measured at the centerline of the steps.
The width of the escalator shall be the width of the step tread. See 6.1.3.5.2 for step width requirements.
The handrail shall be a minimum of 100 mm (4 in.) horizontally and 25 mm (1 in.) vertically away from adjacent surfaces, except that rounded fillets or beveled sides of the handrail stand are permitted to reduce the 25 mm (1 in.) clearance between the handrail and the point where the handrail stand is connected to the balustrade. The centerline of the handrail shall be not more than 240 mm (9.5 in.), measured horizontally, from the vertical plane through the edge of the exposed step. (See Nonmandatory Appendix I, Figs. I-1 and I-2.)
Balustrades shall be installed on each side of the escalator. (See Nonmandatory Appendix I, Fig. I-3.)

(a) For

(1) escalators not equipped with dynamic skirt panels, the balustrade on the step side shall have no areas or moldings depressed or raised more than 6.4 mm (0.25 in.) from the parent surface, except as permitted in 6.1.3.3.10

(2) escalators equipped with dynamic skirt panels, the balustrade on the step side shall have no areas or moldings parallel to the direction of travel that are depressed or raised more than 12 mm (0.47 in.) from the parent surface

(3) all escalators, the depressed or raised areas or moldings shall have boundary edges bevelled or rounded

(b) The balustrade shall be totally closed, except

(1) where the handrail enters the newel base (see 6.1.3.4.3).

(2) gaps between interior panels shall be not wider than 5 mm (0.19 in.). The edges shall be rounded or beveled.

(3) where the dynamic skirt panels enter the balustrade [see 6.1.3.3.7(c)].

(c) The width between the balustrade interior panels in the direction of travel shall not be changed.

Balustrades shall be designed to resist the simultaneous application of a static lateral distributed force of 585 N/m (40 lbf/ft) applied to the side of the handrail and a vertical distributed force of 730 N/m (50 lbf/ft), applied to the top of the handrail.
Glass or plastic, if used in balustrades, shall conform to the requirements of the following standards, whichever is applicable (see Part 9):

(a) ANSI Z97.1 or 16 CFR Part 1201; or

(b) one of the following CGSB Standards: CAN/CGSB-12.1, CAN/CGSB-12.11, or CAN/CGSB-12.12; except that there shall be no requirement for the panels to be transparent.

Plastic bonded to basic supporting panels is not required to conform to these requirements.

The interior low deck, where provided, shall conform to the following (see Nonmandatory Appendix I, Fig. I-1):

(a) The width from the vertical face of the interior panel to the vertical plane of the skirt panel, or dynamic skirt panel cover, where provided, shall not exceed 150 mm (6 in.).

(b) The angle between the surface of the deck and the plane of the nose line of the steps shall be not less than 20 deg nor more than 30 deg.

(c) A horizontal section shall be permitted immediately adjacent to the interior panel. It shall be not greater than 35 mm (1.25 in.).

(d) The deck and the dynamic skirt panel cover, where provided, at the point closest to the step shall withstand a force of 900 N (200 lbf) perpendicular to the line of attachment of the element without detachment or permanent deformation. The force shall be applied to an area of 645 mm2 (1 in.2).

The clearance (loaded gap) between the step tread and the adjacent skirt panel shall be not more than 5 mm (0.2 in.) when 110 N (25 lbf) is laterally applied from the step to the adjacent skirt panel. The applied load shall not deviate from 110 N (25 lbf) by more than ± 11 N (2.5 lbf). The load shall be distributed over an area not less than 1 940 mm2 (3 in.2) and not more than 3 870 mm2 (6 in.2).

(a) The height of the skirt above the tread nose line shall be at least 25 mm (1 in.) measured vertically (see Nonmandatory Appendix I, Fig. I-4).

(b) Skirt panels shall not deflect more than 1.6 mm (0.0625 in.) under a force of 667 N (150 lbf).

(c) The exposed surfaces of the skirt panels adjacent to the steps shall be smooth.

Dynamic skirt panels, where provided, shall conform to the following:

(a) The height of the dynamic skirt panel above the step tread nose line shall be at least 25 mm (1 in.) measured vertically (see Nonmandatory Appendix I, Fig. I-4).

(b) The exposed surfaces of the dynamic skirt panels adjacent to the step treads shall be smooth and in one plane. Exposed edges shall be rounded or beveled.

(c) Guarding shall be provided at the point where the dynamic skirt panels enter the balustrade. The clearance between the guard and the dynamic skirt panels shall not exceed 3 mm (0.125 in.).

(d) The exposed panels that comprise the dynamic skirt shall overlap or interlock such that no clear-through spaces exist. The distance between exposed edges of dynamic skirt panel elements shall not exceed 4 mm (0.16 in.).

(e) There must be a positive mechanical connection between the dynamic skirt panels and the running gear.

(f) The distance between the dynamic skirt panel and the dynamic skirt panel cover shall not exceed 5 mm (0.20 in.).

The gap clearance (loaded gap) at any point between the step tread and the adjacent dynamic skirt panel shall not exceed 5 mm (0.20 in.) when 110 N (25 lbf) is laterally applied from the step to the adjacent dynamic skirt panel. The applied load shall not deviate from 110 N (25 lbf) by more than ± 11 N (2.5 lbf). The load shall be distributed over an area not less than 1 940 mm2 (3 in.2) and not more than 3 870 mm2 (6 in.2).

(a) This requirement is not applicable to escalators with dynamic skirt panels. The step/skirt performance index, when the escalator is subjected to the test specified in 8.6.8.15.19, shall be the maximum value of the recorded instantaneous step/skirt index ey/(ey + 1), where

(SI Units)

e = 2.7183
y = —3.77 + 2.37 (µ) + 0.37 (Lg)
(µ) = the sliding coefficient of friction of a polycarbonate test specimen on the skirt panel at the measurement point calculated when subjected to a 110 N normal load. The coefficient of friction shall be measured without addition of any field-applied lubricant.
Lg = the clearance between the step and the adjacent skirt panel when 110 N is applied from the step to skirt panel, mm

The applied load shall not deviate from 110 N by more than ± 11 N. The load shall be distributed over around or square area not less than 1 940 mm2 and not more than 3 870 mm2.

(Imperial Units)

e = 2.7183
y = —3.77 + 2.37 (µ) + 9.3 (Lg)
µ = the sliding coefficient of friction of a polycarbonate test specimen on the skirt panel at the measurement point calculated when subjected to a 25 lbf normal load. The coefficient of friction shall be measured without addition of any field-applied lubricant.
Lg = the clearance between the step and the adjacent skirt panel when 25 lbf is applied from the step to skirt panel, in.

The applied load shall not deviate from 25 lbf by more than ± 2.5 lbf. The load shall be distributed over a round or square area not less than 3 in.2 and not more than 6 in.2

(b) The step/skirt performance index polycarbonate test specimen shall conform to the following specifications:

(1) Material: Polycarbonate without fillers

(2) Color: Natural, no pigments

(3) Finish: Glossy (roughness less than 0.8 µm (32 µin.)

(4) Area in contact with skirt panel: 2 900 ± 325 mm2 (4.5 ± 0.5 in.2) and at least 0.8 mm (0.03 in.) thick

(5) Specification: GE Lexan 100 series or equivalent polycarbonate

(c) The escalator step/skirt performance index shall be either of the following:

(1) ≤ 0.15

(2) ≤ 0.25 when a skirt deflector device complying with the requirements of 6.1.3.3.10 is provided

Deflector devices shall be permitted. Where provided, deflector devices shall extend from skirt panels parallel to the escalator path of travel. Means to secure such deflector devices are permitted to be on the exposed surface of the skirt. Any exposed fastener heads shall be of the tamper-resistant type and flush to within 1 mm (0.04 in.).

(a) Rigid elements shall be in conformance with the following conditions:

(1) Horizontal protrusions extending above the step shall be 18 mm (0.75 in.) maximum. Corners or changes in profile shall be rounded or beveled. The exposed surfaces of such elements shall be smooth and permanently treated with a low-friction material.

(2) On the incline, the area of any protrusion shall lie entirely above a line on the skirt panel positioned at least 25 mm (1 in.) vertically above the step nose line. The lower surface shall be beveled not less than 10 deg upward and the upper surface shall be beveled not less than 15 deg downward. (See Fig. 6.1.3.3.10.)

Fig. 6.1.3.3.10 Dimensions

(3) At the upper and lower landing, any protrusion shall lie entirely above a line on the skirt panel positioned at least 50 mm (2 in.) vertically above the step nose line. The lower surface shall be beveled not less than 10 deg upward and the upper surface shall be beveled not less than 15 deg downward. Any rigid elements at the landings shall smoothly blend into the rigid elements along the incline in accordance with the radius of curvature of the transition zone.

(4) When attached to the skirt, rigid elements shall withstand a force of 900 N (200 lbf) perpendicular to the line of attachment of the element without detachment or permanent deformation. The force shall be applied to an area of 645 mm2 (1 in.2).

(b) Flexible elements shall be in conformance with the following conditions:

(1) The horizontal protrusion extending from the skirt surface above the step shall be 50 mm (2 in.) maximum.

(2) They shall be capable of deflecting to an angle of 10 deg or greater above the horizontal.

(3) Noncontinuous flexible elements shall be allowed to deflect to allow a maximum of 9.5 mm (0.375 in.) interference with any point on the step surface.

(4) Continuous flexible elements shall not deflect such that they can contact the steps.

(a) On high deck balustrades, a solid guard shall be provided in the intersection of the angle of the outside balustrade deck and the ceiling or soffit, under the following conditions:

(1) where the clearance between the outside edge of the deck and the ceiling or soffit is 300 mm (12 in.) or less; or

(2) where the projected intersection of the outside deck and the ceiling or soffit is 600 mm (24 in.) or less from the centerline of the handrail.

(b) On low deck balustrades, a solid guard shall be provided to protect the intersection formed by the top of the handrail and the plain of the ceiling or soffit where the centerline of the handrail is 350 mm (14 in.) or less from the ceiling or soffit.

(c) The vertical edge of the guard shall be a minimum of 350 mm (14 in.) in length.

(d) The escalator side of the vertical face of the guard shall be flush with the face of the wellway.

(e) The exposed edge of the guard shall present a minimum width of 25 mm (1 in.) and a minimum radius of 12 mm (0.5 in.).

(f) Guards are permitted to be of glass or plastic, provided they meet the requirements of 6.1.3.3.3.

See also Nonmandatory Appendix I, Fig. I-5.

On high deck balustrades, antislide devices shall be provided on decks or combinations of decks when the outer edge of the deck is greater than 200 mm (8 in.) from the edge of the handrail, or on adjacent escalators when the unobstructed distance between the edge of the facing handrail is greater than 300 mm (12 in.).

These devices shall consist of raised objects fastened to the decks, no closer than 100 mm (4 in.) to the handrail nor greater than 300 mm (12 in.) from the handrail. They shall be spaced not greater than 2 000 mm (78 in.) apart as measured on a line parallel to the direction of travel and not greater than 300 mm (12 in.) as measured on a horizontal line perpendicular to the direction of travel. The height shall be not less than 50 mm (2 in.). There shall be no sharp corners or edges. See Nonmandatory Appendix I, Fig. I-6.

(a) A barricade to restrict access to the outer deck on low deck exterior balustrades shall be provided at the top and bottom ends of each escalator where the outer deck width exceeds 125 mm (5 in.). On parallel abutting units, this protection shall be provided where the combined outer deck width exceeds 125 mm (5 in.). The barricade shall extend to a height that is nominally 100 mm (4 in.) below the top of the handrail.

(b) When an escalator is not located at the edge of a floor surface, the barricade shall be installed on the outer deck at a point 1 000 mm (40 in.) above the floor where the bottom of the barricade intersects the outer deck.

(c) On parallel adjacent escalators, where the common low deck between adjacent interior panels exceeds 400 mm (16 in.), deck barricades should be spaced evenly up the incline at no greater than 4.6 m (15 ft) measured on a line parallel to the direction of travel.

(d) Barricades made of glass or plastic shall conform to the requirements of 6.1.3.3.3. All exposed barricade attachment fastener heads shall be of the tamper-resistant type.

Each balustrade shall be provided with a handrail moving in the same direction and at substantially the same speed as the steps. In the case of curved escalators, this shall be substantially the same angular velocity. The speed of the handrail shall not change when a retarding force of 450 N (100 lbf) is applied to the handrail opposite to the direction of travel.
Each moving handrail shall extend at normal handrail height not less than 300 mm (12 in.) beyond the line of points of the combplate teeth at the upper and lower landings.
Hand or finger guards shall be provided at a point where the handrail enters the balustrade.
Splicing of handrails shall be done in such a manner that the joint is free of any pinching effect.
The vertical height from step nose to top of handrail shall be not less than 900 mm (35 in.) nor more than 1 000 mm (39 in.). See 6.1.1.1 for floor opening protection adjacent to escalator wellways.
The horizontal clearance between either lip of the handrail and the handrail stand shall not exceed 10 mm (0.375 in.). (See Nonmandatory Appendix I, Fig. I-2.)

(a) Step frames, treads, risers, and dynamic skirt panels, excluding the step's attachments or inserts, shall be metal, except that magnesium alloys shall not be used; or the materials, in their end-use configuration, shall have a flame spread index of 0 to 50 based on the tests conducted in accordance with the requirements of ASTM E84, UL 723, NFPA 255, or CAN/ULC-S102.2, whichever is applicable (see Part 9).

(b) Nonmetallic attachments and inserts (excluding wheels) shall be classified 94 HB or better in accordance with ANSI/UL 94.

(c) Step treads shall be horizontal, and shall afford a secure foothold. The step supporting system shall be so designed so that the back of the step cannot tip upward more than 6 mm (0.25 in.) at any point.

The depth of any step tread in the direction of travel shall be not less than 400 mm (15.75 in.), and the rise between treads shall be not more than 220 mm (8.5 in.). The width of a step tread shall be not less than 560 mm (22 in.) nor more than 1 020 mm (40 in.). (See Nonmandatory Appendix I, Fig. I-7.)
The step riser shall be provided with vertical cleats, which shall mesh with slots on the adjacent step tread wherever the steps are exposed. (See Nonmandatory Appendix I, Fig. I-8.)
The maximum clearance between step treads on the horizontal run shall be 6 mm (0.25 in.). (See Nonmandatory Appendix I, Fig. I-12.)
The tread surface of each step shall be slotted in a direction parallel to the travel of the steps. Each slot shall be not more than 6.5 mm (0.25 in.) wide and not less than 9.5 mm (0.375 in.) deep, and the distance from center to center of adjoining slots shall be not more than 9.5 mm (0.375 in.).

Slots shall be so located on the step tread surface as to form a cleat on each side of the step tread adjacent to the skirt or dynamic skirt panel.

There shall be demarcation lines on the step tread along the back of the step to delineate the division between steps. These lines shall be marked by a yellow strip a minimum of 38 mm (1.5 in.) in width and a maximum of 50 mm (2 in.). [See 6.1.3.5.1(b).]

There shall be demarcation lines on the step tread along the sides of the step. These side lines shall be yellow and at least 13 mm (0.5 in.) wide and shall not exceed 50 mm (2 in.). [See 6.1.3.5.1(b).]

Each step width shall be subjected to the step fatigue test as described in 8.3.11.
Where support wheels attached to the steps are not located within the width of the step, provision shall be made to prevent the step from falling into the escalator interior due to a loss of one or more of the support wheel assemblies.

(a) There shall be a combplate, to which the combs shall be fastened, at the entrance and at the exit of every escalator.

(b) The comb teeth shall be meshed with and set into the slots in the tread surfaces so that the points of the teeth are always below the upper surface of the treads.

(c) Combplates shall be adjustable vertically. Sections forming the comb teeth shall be readily replaceable.

(d) The comb section, combplate, and landing plate assemblies shall not make contact with the step treads when a weight of 160 kg (350 lb) is applied to any area 200 mm × 300 mm (8 in. × 12 in.) centered on the plates with the 300 mm (12 in.) dimension parallel to the direction of travel.

There shall be a visual contrast between the comb and step, achieved by color, pattern, or texture.
The adjacent floor surfaces at each landing shall be continuous with the top of the landing plate with no abrupt change in elevation of more than 6 mm (0.25 in.).
The entry and exit zone shall be kept clear of all obstacles. The width of the zone shall be not less than the width between the centerlines of the handrails plus 200 mm (8 in.). The length of the zone, measured from the end of the newel, shall be not less than twice the distance between the centerlines of the handrails. Space shall be provided to accommodate all traffic in the safety zone.

NOTE: These dimensions are absolute minimums.

There shall be a minimum of two and a maximum of four flat steps at the entrance and exit of every escalator. (See 1.3 and 6.1.3.5.2.)
The truss or girder shall be designed to safely sustain the running gear in operation. In the event of failure of the track system, it shall retain the running gear within the confines of this truss.

Where tightening devices are operated by means of tension weights, provision shall be made to retain these weights in the truss if they should be released.

Step wheel tracks shall be designed so as to prevent displacement of the running gear if a step chain breaks.
For the purpose of structural design, the rated load shall be considered to be not less than the following:

(SI Units)

Structural rated load (kg) = D1 (W + 203)A/1 000

(Imperial Units)

Structural rated load (lb) = D2 (W + 8)A/12

where

A = length of the horizontal projection of the entire truss measured along its centerline, m (ft)
D1 = Loading Factor = 270 kg/m2
D2 = Loading Factor = 55.2 lb/ft2
W = width of the escalator, mm (in.) (see 6.1.3.2)

(a) For the purpose of driving machine and power transmission calculations, the rated load for all single driving machines shall be considered to be not less than the following:

(SI Units)

Machinery rated load (kg) = D3 (W + 203)B1/1 000

(Imperial Units)

Machinery rated load (lb) = D4 (W + 8)B1/12

(b) The rated load per module for two or more modular driving machines shall be considered to be not less than:

(SI Units)

Machinery rated load (kg) = D3 (W + 203)B2/l 000

(Imperial Units)

Machinery rated load (lb) = D4 (W + 8)B2/12

where

B1 = cot θ × total rise, m (ft)
B2 = cot θ × rise per module, m (ft)
D3 = Loading Factor = 210 kg/m2
D4 = Loading Factor = 42.0 lb/ft2
W = width of the escalator, mm (in.) (see 6.1.3.2)
θ = the angle of inclination, deg (see 6.1.3.1)

(a) For the purpose of brake calculations, the rated load for all single driving machines shall be considered to be not less than the following:

(1) with escalator stopped

(SI Units)

Brake rated load (kg) = D5 (W + 203)B1/1 000

(Imperial Units)

Brake rated load (lb) = D6 (W + 8)B1/12

(2) with escalator running

(SI Units)

Brake rated load (kg) = D3 (W + 203)B1/1 000

(Imperial Units)

Brake rated load (lb) = D4 (W + 8)B1/12

(b) The rated load per module for two or more modular driving machines shall be considered to be not less than the following:

(1) with escalator stopped

(SI Units)

Brake rated load (kg) = D5 (W + 203)B2/1 000

(Imperial Units)

Brake rated load (lb) = D6 (W + 8)B2/12

(2) with escalator running

(SI Units)

Brake rated load (kg) = D3 (W + 203)B2/1 000

(Imperial Units)

Brake rated load (lb) = D4 (W + 8)B2/12

where

B1 = cot θ × total rise, m (ft)
B2 = cot θ × rise per module, m (ft)
D3 = Loading Factor = 210 kg/m2
D4 = Loading Factor = 42.0 lb/ft2
D5 = Loading Factor = 360 kg/m2
D6 = Loading Factor = 73.7 lb/ft2
W = width of the escalator, mm (in.) (see 6.1.3.2)
θ = the angle of inclination, deg (see 6.1.3.1)
The step shall be designed to support a load of 135 kg (300 lb) on a 150 mm × 250 mm (6 in. × 10 in.) plate placed on any part of the step with the 250 mm (10 in.) dimension in the direction of step travel.
Factors of safety are based on either single driving-machine design or modular driving-machine design.

The factors of safety shall be at least the following.

Trusses and all supporting structures, including tracks, shall conform to the AISC Specifications for Design, Fabrication, and Erection of Structural Steel for Buildings, or the CSA Standard CAN/CSA-S16.1, whichever is applicable (see Part 9), based on the maximum static load calculated per 6.1.3.9.1.
For driving-machine parts based on not less than the loads calculated per 6.1.3.9.2:

(a) where made of steel or bronze, the factor of safety shall be 8

(b) where made of cast iron or other materials, the factor of safety shall be 10

For power transmission members, the factor of safety shall be 10, based on not less than the loads calculated per 6.1.3.9.2.
For steps, the factor of safety shall be 5, based on not less than the loads designated in 6.1.3.9.4.
The use of chains with cast iron links shall not be permitted.
The minimum headroom shall be 2 130 mm (84 in.) measured vertically from the step noseline, landing plates, and landings.
Welding shall conform to 8.8.
Components not used directly in connection with the escalator are prohibited to be installed on, in, or through the escalator.
Permanent provisions shall be made to prevent accumulation of groundwater in the pit. Drains and sump pumps, where provided, shall comply with the applicable plumbing code.
The rated speed shall be not more than 0.5 m/s (100 ft/min), measured along the centerline of the steps in the direction of travel.

The speed attained by an escalator after start-up shall not be intentionally varied, except as permitted by 6.1.4.1.2.

Variation of the escalator speed after start-up shall be permitted provided the escalator installation conforms to all of the following:

(a) The acceleration and deceleration rates shall not exceed 0.3 m/s2 (1.0 ft/sec2).

(b) The rated speed is not exceeded.

(c) The minimum speed shall be not less than 0.05 m/s (10 ft/min).

(d) The speed shall not automatically vary during inspection operation.

(e) Passenger detection means shall be provided at both landings of the escalator such that

(1) detection of any approaching passenger shall cause the escalator to accelerate to or maintain the full escalator speed conforming to 6.1.4.1.2(a) through (d)

(2) detection of any approaching passenger shall occur sufficiently in advance of boarding to cause the escalator to attain full operating speed before a passenger walking at normal speed [1.35 m/s (270 ft/min)] reaches the combplate

(3) passenger detection means shall remain active at the egress landing to detect any passenger approaching against the direction of escalator travel and shall cause the escalator to accelerate to full rated speed and sound the alarm (see 6.1.6.3.1) at the approaching landing before the passenger reaches the combplate

(f) Automatic deceleration shall not occur before a period of time has elapsed since the last passenger detection that is greater than 3 times the amount of time necessary to transfer a passenger between landings.

(g) Means shall be provided to detect failure of the passenger detection means and shall cause the escalator to operate at full rated speed only.

The driving machine shall be connected to the main drive shaft by toothed gearing, a mechanical coupling, or a chain.
An electric motor shall not drive more than one escalator driving machine. A driving machine shall not operate more than one escalator.

(a) Each escalator driving machine shall be provided with an electrically released and mechanically or magnetically applied brake. If the brake is magnetically applied, a ceramic permanent magnet shall be used. There shall be no intentional time delay designed into the application of the brake.

(b) The brake shall be applied automatically if the electrical power supply is interrupted. The brake shall be capable of stopping the down-running escalator with any load up to the brake rated load [see 6.1.3.9.3(a)(2) or (b)(2)]. The brake shall hold the stopped escalator with any load up to the brake rated load [see 6.1.3.9.3(a)(1) or (b)(1)].

(c) Driving-machine brakes shall stop the down-running escalator steps at an average rate not greater than 0.91 m/s2 (3 ft/s2) as measured over the total retardation time. No peak horizontal retardation value exceeding 0.91 m/s2 (3 ft/s2) shall have a time duration greater than 0.125 s (see Nonmandatory Appendix I, Fig. I-11). (See also 6.1.6.3.6.)

(d) The escalator brake shall be provided with a data plate that is readily visible, located on the machine brake and when necessary, a duplicate data plate with the certification mark shall be placed adjacent to the machine brake. The data plate shall indicate:

(1)(a) for fixed torque brakes, the range of brake torque that complies with 6.1.5.3.1 and 6.1.6.3.6; or

(1)(b) for variable torque brakes, the minimum brake torque for a loaded escalator and the minimum stopping distance for the unloaded escalator, which complies with 6.1.5.3.1 and 6.1.6.3.6;

(2) the method of measuring the torque, designated "BREAKAWAY" or "DYNAMIC," based on the method used when measuring the torque;

(3) the location where the torque is to be measured, e.g., "MOTOR SHAFT," "MACHINE INPUT SHAFT," "MAIN DRIVE SHAFT"

(4) the type of brake as fixed or variable torque;

(5) the maximum stopping distance with rated load in the down direction that corresponds to the minimum distance between

(a) the comb and the step when the step is positioned to activate any of the safety devices required in 6.1.6.3.6, 6.1.6.3.9, 6.1.6.3.11, 6.1.6.5, or

(b) the activation point of the Dynamic Skirt Panel Obstruction Device (see 6.1.6.3.16) and the entrance of the skirt panel into the balustrade.

(e) Where means other than a continuous shaft, mechanical coupling, or toothed gearing is used to connect the motor to a gear reducer, the escalator driving-machine brake shall be located on the gear reducer or main drive shaft.

If the escalator driving-machine brake is separated from the main drive shaft by a chain used to connect the driving machine to the main drive shaft, a mechanically or magnetically applied brake capable of stopping a down-running escalator with brake rated load (see 6.1.3.9.3) shall be provided on the main drive shaft. If the brake is magnetically applied, a ceramic permanent magnet shall be used.
Escalator driving-machine brakes shall be certified to the requirements of 8.3.1 and 8.3.6.
Operating and safety devices conforming to the requirements of this Section shall be provided. When more than one driving machine per escalator is utilized, actuation of devices covered by this Section shall simultaneously control all driving machines.
Automatic starting by any means, or automatic stopping, except as required in 6.1.6, shall be prohibited.
Escalators shall be provided with starting switch(es) conforming to the following:

(a) Location and Design. The switch(es) shall be:

(1) located so that the escalator steps are within sight.

(2) key operated, of the continuous-pressure spring-return type, and shall be operated by a cylinder-type lock having not less than a five-pin or five-disk combination.

(3) clearly and permanently marked "DOWN," "RUN," and "UP," in that order, with the key removable only in the "RUN" (spring return) position. The switch(es) shall be rotated clockwise to go from the "DOWN" to "RUN" to "UP" position.

(b) Operating Requirements. The operation of the switch(es) shall initiate movement of the escalator. The escalator shall not start (restart) unless all starting switch(es) were first in the "RUN" position.

(c) The starting switch(es) shall be located within reach of an emergency stop button (see 6.1.6.3.1).

(d) The key shall be of Group 2 Security (see 8.1).

Each escalator shall be equipped with inspection controls not accessible to the general public during normal operation to provide constant pressure operation during maintenance, repair, or inspection by means of a manually operated control device.

(a) General Requirements

(1) Switches for transferring the control of the escalator to inspection operation shall be provided or a switch shall be provided at each landing in a portable control station; the switch(es) shall function as follows:

(a) be through a contact that shall be positively opened mechanically and whose opening shall not depend solely on springs

(b) be manually operated

(c) be labeled "INSPECTION"

(d) have two positions, labeled "INSPECTION" or "INSP" and "NORMAL" or "NORM"

(e) when in the "INSPECTION" position, it shall cause the movement of the escalator to be solely under the control of constant pressure operating devices at that landing or in that portable control station

(f) be arranged so that if more than one inspection transfer switch is in the "INSPECTION" position, then all constant pressure operating devices at all locations shall be inoperative

(g) be protected against accidental contact

(2) Constant pressure operating devices shall

(a) allow movement of the escalator only by constant application of manual pressure

(b) be distinctly recognizable from indications on the device as to the direction of travel controlled

(c) be protected against accidental contact

(d) be located so that the escalator steps are within sight

(3) A stop switch conforming to 6.1.6.3.15 shall be provided adjacent to the constant pressure operating devices.

(4) When portable control stations are used, the cord length shall not exceed 3 000 mm (120 in.) in length.

(b) Plug-in Portable Control Station. A plug-in portable control station shall be permitted, provided that

(1) either a transfer switch conforming to 6.1.6.2.2(a)(1) is complied with, or when plugged in, the escalator shall automatically transfer to inspection operation

(2) when the switch, if provided, is in the "INSPECTION" position, or when the control station is plugged in, it shall cause the movement of the escalator to be solely under the control of constant pressure operating devices contained in the portable unit

(3) the plug-in portable control station is stored at the upper landing machinery space

Electrical protective devices shall be provided in accordance with 6.1.6.3.1 through 6.1.6.3.16.

(a) Location. A red stop button shall be visibly located at the top and the bottom landings on the right side facing the escalator. In jurisdictions not enforcing NBCC, remote stop buttons are prohibited. In jurisdictions enforcing NBCC, if remote buttons are provided, they shall be located within view of the escalator.

(1) On high deck balustrades, they shall be located on the curved newel deck in the upper quadrant, with the centerline of the button at a 45 deg angle from the horizontal.

(2) On low deck balustrades, they shall be located below the handrail height. The centerline of the button shall be located on a radial line 45 deg above the horizontal, such that no part of the button assembly is within 38 mm (1.5 in.) of the bottom of the handrail and the button is no more than 90 mm (3.5 in.) from the bottom of the handrail.

(b) Cover, Alarm, and Marking. The buttons shall be covered with a transparent cover that can be readily lifted or pushed aside. When the cover is moved, an audible warning signal shall be activated. The signal shall have a sound intensity of 80 dBA minimum at the button location. The cover shall be marked "EMERGENCY STOP," "MOVE COVER" or equivalent legend (e.g., "LIFT COVER," "SLIDE COVER,"), and "PUSH BUTTON." "EMERGENCY STOP" shall be in letters not less than 12 mm (0.5 in.) high. Other required wording shall be in letters not less than 4.8 mm (0.188 in.) high. The cover shall be self-resetting.

(c) Operation. The operation of either of these buttons shall cause the electric power to be removed from the escalator driving-machine motor and brake. It shall not be possible to start the escalator by these buttons.

An escalator speed-monitoring device shall be provided.

(a) The operation of the device shall cause the electric power to be removed from the driving-machine motor and brake should the speed exceed the rated speed by more than 20%.

(b) The device shall be of the manual-reset type.

(a) A broken step-chain device shall be provided, which shall cause the electric power to be removed from the driving-machine motor and brake

(1) if a step chain breaks

(2) where no automatic chain tension device is provided, if excessive sag occurs in either step chain

(b) The device shall be of the manual-reset type.

When the driving machine is connected to the main drive shaft by a chain, a device shall be provided that will cause the application of the brake on the main drive shaft, and will also cause the electric power to be removed from the driving-machine motor and brake if the drive chain between the machine and the main drive shaft becomes disengaged from the sprockets. The device shall be of the manual-reset type.
A stop switch conforming to the following requirements shall be provided in each machinery space and other spaces where means of access to the interior space is provided (see 6.1.7.3), except for the machinery space where the mainline disconnect switch is located

(a) when opened ("STOP" position), cause the electric power to be removed from the escalator driving-machine motor and brake

(b) be of the manually opened and closed type

(c) have red operating handles or buttons

(d) be conspicuously and permanently marked "STOP," and shall indicate the "STOP" and "RUN" positions

(e) shall have contacts that are positively opened mechanically and their opening shall not be solely dependent on springs

Means shall be provided to cause the electric power to be removed from the escalator driving-machine motor and brake if an object becomes caught between the step and the skirt as the step approaches the upper or lower combplate. The device shall be located at a point at which the step assumes a flat step position (see 6.1.3.6.5). The escalator shall stop before that object reaches the combplate with any load up to full brake rated load with escalator running [see 6.1.3.9.3(a)(2) and (b)(2)]. The device shall be of the manual reset type or it shall be permitted to automatically reset not more than one time within 24 hr of operation and thereafter require a manual reset before the next restart. Interruption of power during operation should not cause the device to lose the status of the timer nor the count of events.
Egress restrictors that would prevent the free and continuous exiting of passengers, if used, shall provide a signal to a device on the escalator that shall cause the electric power to be removed from the escalator driving-machine motor and brake when the exit restrictors begin to close.
Means shall be provided to cause the electric power to be removed from the driving-machine motor and brake in case of reversal of travel while the escalator is operating in the ascending direction. The device shall be of the manual-reset type.
Means shall be provided in the passenger-carrying line of the track system to detect a step forced upward in the lower transition curve at or prior to the point of tangency of the horizontal and curved track. The means shall actuate when the riser end of the step is displaced upward more than 5 mm (0.20 in.) at the lower landing. Actuation of the means shall cause power to be removed from the driving-machine motor and brake. The escalator shall stop, before the detected step reaches the combplate with any load up to brake rated load with escalator running [see 6.1.3.9.3(a)(2) and (b)(2)]. The device shall be of the manual reset type or it shall be permitted to automatically reset not more than one time within 24 hr of operation and thereafter require a manual reset before the next restart. Interruption of power during operation should not cause the device to lose the status of the timer nor the count of events.
If the drive motor is attached to a gear reducer by means other than a continuous shaft, mechanical coupling, or toothed gearing, a device shall be provided that will cause the electric power to be removed from the driving-machine motor and brake (see 6.1.5.3.1), if the motor becomes disconnected from the gear reducer. The device shall be of the manual-reset type.
Step level devices shall be located at the top and bottom of the escalator. These devices shall detect downward displacement of 3 mm (0.125 in.) or greater at the riser end at either side of the step. When activated, the device shall cause the escalator to stop before the step enters the combplate. The device shall cause power to be removed from the driving-machine motor and brake. Devices shall be of the manual-reset type.
A handrail entry device shall be provided at each newel. It shall be operative in the newels in which the handrail enters the balustrade. It shall cause the escalator to stop by removing power from the driving-machine motor and brake. It shall operate in either of two ways:

(a) if an object becomes caught between the handrail and the handrail guard

(b) if an object approaches the area between the hand-rail and the handrail guard

For those units that rely on an opening of the balustrade to prevent entrapment, all handrail entry devices shall be operative whenever the handrails are operating. The device shall be of the manual reset type or it shall be permitted to automatically reset not more than one time within 24 hr of operation and thereafter require a manual reset before the next restart. Interruption of power during operation should not cause the device to lose the status of the timer nor the count of events.

Devices shall be provided that will cause the opening of the power circuit to the escalator driving-machine motor and brake if either

(a) a horizontal force not greater than 1 780 N (400 lbf) in the direction of travel is applied at either side, or not greater than 3 560 N (800 lbf) at the center of the front edge of the comb-plate; or

(b) a resultant vertical force not greater than 670 N (150 lbf) in the upward direction is applied at the center of the front of the combplate.

These devices shall be of the manual-reset type.

A device shall be provided on curved escalators to cause the opening of the power circuit to the escalator driving-machine motor and brake, should a step be excessively displaced horizontally due to a failure in the lateral support system. The device shall be of the manual-reset type.
A stop switch conforming to the following requirements shall be provided when required by 6.1.6.2.2:

(a) when opened ("STOP" position), cause the electric power to be removed from the escalator driving-machine motor and brake

(b) be of the manually opened and closed type

(c) have red operating handles or buttons

(d) be conspicuously and permanently marked "STOP," and shall indicate the "STOP" and "RUN" positions

(e) shall have contacts that are positively opened mechanically and their opening shall not be solely dependent on springs

Means shall be provided to cause the electric power to be removed from the escalator driving-machine motor and brake if an object becomes caught between the dynamic skirt panel and the dynamic skirt panel cover in the upper or lower transition zone. The device shall be of the manual-reset type. The escalator shall stop before that object reaches the balustrade with any load up to full brake rated load with the escalator running [see 6.1.3.9.3(a)(2) and (b)(2)].
A hand-rail speed monitoring device shall be provided that will cause the activation of the alarm required by 6.1.6.3.1(b) without any intentional delay, whenever the speed of either handrail deviates from the step speed by 15% or more. The device shall also cause electric power to be removed from the driving-machine motor and brake when the speed deviation of 15% or more is continuous within a 2 s to 6 s range. The device shall be of the manual reset type or it shall be permitted to automatically reset not more than one time within 24 hr of operation and thereafter require a manual reset before the next restart. Interruption of power during operation should not cause the device to lose the status of the timer nor the count of events.

(a) A device shall be provided to detect a missing step and bring the escalator to a stop, before the gap resulting from the missing step emerges from the comb. The device shall cause power to be removed from the driving-machine motor and brake. The device shall be of the manual-reset type.

(b) For escalators with dynamic skirts, a device shall be provided to detect a missing dynamic skirt panel and bring the escalator to a stop, before the gap resulting from the missing dynamic skirt panel emerges from the balustrade. The device shall cause power to be removed from the driving-machine motor and brake. The device shall be of the manual-reset type.

Tandem operation escalators shall be electrically interlocked where traffic flow is such that bunching will occur if the escalator carrying passengers away from the intermediate landing stops. The electrical interlocks shall stop the escalator carrying passengers into the common intermediate landing if the escalator carrying passengers away from the landing stops. These escalators shall also be electrically inter-locked to assure that they run in the same direction.
Smoke detectors shall be permitted that shall activate the alarm required by 6.1.6.3.1(b) and, after at least 15 s, shall cause the interruption of power to the driving-machine motor and brake.
A caution sign shall be located at the top and bottom landing of each escalator, readily visible to the boarding passengers.

The sign shall include the following wording:

(a) "Caution"

(b) "Passengers Only"

(c) "Hold Handrail"

(d) "Attend Children"

(e) "Avoid Sides"

The sign shall be standard for all escalators and shall be identical in format, size, color, wording, and pictorials as shown in Fig. 6.1.6.9.1. The sign shall be durable and have a maximum thickness of 6.4 mm (0.25 in.), with rounded or beveled corners and edges.

Fig. 6.1.6.9.1 Caution Sign

Signs or graphics relating to safety shall not be permitted on the escalator in such a manner nor adjacent to the escalator in such a manner that obstructs boarding passenger view of the signs required in 6.1.6.9.1, physically obstructs passenger flow at the landings as specified in the safety zone (see 6.1.3.6.4), nor obstructs or reduces passenger access to the handrails. They shall be legible and not be distracting, create passenger flow hazards, or impair function of safety devices.
Signs or graphics other than those specified in 6.1.6.9.1 and 6.1.6.9.2 shall not be permitted adjacent to the escalator in such a manner that obstructs boarding passenger view of the signs required in 6.1.6.9.1, obstructs or reduces passenger access to the handrails, within the safety zone (see 6.1.3.6.4), nor on the escalator except for signs, graphics, or markings required by this Code, manufacturer's identification, owner's identification, step riser signs or graphics, and handrail signs or graphics that are permitted on the escalator. They shall not be distracting, create passenger flow hazards, or impair function of safety devices.
The design and installation of the control and operating circuits shall conform to 6.1.6.10.1 through 6.1.6.10.4.
The occurrence of a single ground or the failure of any single magnetically operated switch, contactor, or relay; or any single solid-state device; or a software system failure, shall not

(a) permit the escalator to start

(b) render ineffective any electrical protective device required by 6.1.6.3

(c) render ineffective the handrail speed-monitoring device required by 6.1.6.4

(d) render ineffective the missing step device required by 6.1.6.5

(e) render ineffective the missing dynamic skirt device required by 6.1.6.5

(f) permit the escalator to revert to normal operation when on inspection operation (see 6.1.6.2.2)

NOTE [6.1.6.10.1(b) through (e)]: Requirements apply only to the circuits in which the devices are used and not to the devices themselves.

Methods used to satisfy 6.1.6.10.1 using software systems are permitted, provided that a non-software-controlled means is also used to remove power from the driving-machine motor and brake.
Methods used in the control and operating circuits to satisfy the requirements of 6.1.6.10.1 shall be checked prior to each start of the escalator. When a single ground or failure as specified in 6.1.6.10.1 occurs, the escalator shall not be permitted to restart.
Escalators with driving-machine motors employing static control shall conform to the following:

(a) Two devices shall be provided to remove power from the driving-machine motor. At least one device shall be an electromechanical contactor.

(1) The contactor shall be arranged to open each time the escalator stops.

(2) The contactor shall cause the removal of power from the driving-machine brake in accordance with 6.1.6.3.4.

(b) An additional contactor shall be provided to also open the driving-machine brake circuit. This contactor is not required to have contacts in the driving-machine motor circuit.

(c) The electrical protective devices required by 6.1.6.3 shall control the solid-state device and both contactors.

(d) After each stop of the escalator, the escalator shall not respond to a signal to start unless both contactors [see 6.1.6.10.4(a) and (b)] are in the de-energized position.

If the handrail speed monitoring device required by 6.1.6.4, the missing step or missing skirt device, required by 6.1.6.5, or any electrical protective device required by 6.1.6.3, requires electrical power for its functioning

(a) a loss of electrical power to the device shall cause power to be removed from the escalator driving-machine motor and brake

(b) the occurrence of a single ground or the failure of any single magnetically operated switch, contactor, or relay; or any single solid-state device; or a software system failure, shall not render the missing step or missing dynamic skirt devices or handrail speed monitoring device or electrical protective device inoperative

(c) when a single ground or failure as described in 6.1.6.11(b) occurs, the escalator shall not be permitted to restart

The installation of capacitors, or other devices, the operation or failure of which will cause an unsafe operation of the escalator, is prohibited. No permanent device shall be installed, except as provided for in this Code, which will make any required electrical protective device ineffective. (See also 6.1.6.3.4.)
The completion or maintenance of an electric circuit shall not be used to stop the escalator when the emergency stop switch is opened or when any of the electrical protective devices operate. These requirements do not apply to speed control switches (see 6.1.6.3.2, 6.1.6.3.8, and 6.1.6.4).
Where manual reset is required, interruption of power to the escalator shall not cause a safety device to lose the status of the event upon return of power. The cause of the malfunction shall be indicated in some manner, so that an examination will be made prior to restarting the escalator. The starting switch shall not be operable until the reset for each activated device is accomplished.
Where electromechanical contactors or relays are provided to fulfill the requirements of 6.1.6.10.1 through 6.1.6.10.4, they shall be considered to be used in critical operating circuits. If contact(s) on these electromechanical contactors or relays are used for monitoring purposes, they shall be prevented from changing state if the contact(s) utilized in a critical operating circuit fail to open in the intended manner. The monitoring contact(s) shall be positively actuated and shall not be solely dependent upon springs.
Permanent electric lighting and at least one duplex receptacle rated at not less than 15 A, 120 V shall be provided in every remote machine room.

The illumination shall be not less than 100 lx (10 fc) at the floor level. The lighting control switch shall be located within easy reach of the access to such rooms and so located that it can be operated without passing over or reaching over any part of the machinery.

A duplex receptacle rated at not less than 15 A, 120 V, accessibly located, shall be provided under the access plates (see 6.1.7.3) at the top and bottom landings and in any machine areas located in the incline.
Landing floor plates and all exposed step treads shall be illuminated with a lighting intensity of not less than 50 lx (5 fc). The illumination of these surfaces shall be of uniform intensity and not contrast materially with that of the surrounding area.
Reasonable access to the interior of the escalator shall be provided for inspection and maintenance.
Access plates requiring no more than 310 N (70 lbf) effort to open shall be provided at the top and bottom landing for inspection and maintenance. The plates shall be made of a material that will afford a secure foothold. The use of stone, terrazzo, or concrete as a fill material is prohibited in panels within the confines of the escalator truss.
Access plates at the top and bottom landings shall be securely fastened by a mechanical means.
If access doors are provided in the side of the escalator enclosure, they shall be kept closed and locked. The key shall be removed only when in the locked position. The key shall be of Group 2 Security (see 8.1).
Where access is provided to a machinery enclosure, a fixed guard shall be provided to prevent accidental contact with the moving steps by a person servicing equipment from within the enclosure. The guard shall be made of material that will reject a 13 mm (0.5 in.) diameter ball and shall extend the full width of the step treads. A guard is not required where the only equipment normally serviced from within the enclosure is within the step band.
All electrical equipment and wiring shall conform to NFPA 70 or CSA-C22.1, whichever is applicable (see Part 9). In jurisdictions enforcing CSA-C22.1, power supply-line disconnecting means shall not be opened automatically by a fire alarm system.
Electrical equipment shall be listed/certified and labeled/marked. CSA B44.1/ASME A17.5 defines the scope and applicable requirements for this listing/certification.
Control equipment shall be tested in accordance with the testing requirements of EN 12016 by exposing it to interference levels at the test values specified for "safety circuits." The interference shall not cause any of the conditions described in 6.1.6.10.1(a) through (f). If enclosure doors or suppression equipment must remain installed to meet the above requirements, warning signs to that effect shall be posted on the control equipment.
Escalators shall be so constructed that exposure to the weather will not interfere with normal operation.
The escalator equipment and its supports shall be protected from corrosion.
Electrical equipment shall be provided with a degree of protection of at least Type 4 construction as specified in NEMA 250, and wiring shall be identified for use in wet locations in accordance with NFPA 70 or CSA-C22.1 as applicable (see Part 9).
A cover, directly over the horizontal projection of the escalator, shall be provided. The cover shall extend outward from the centerline of the handrail so that a line extended from the edge of the cover to the centerline of the handrail forms an angle of not less than 15 deg from the vertical.
When the escalator is subjected to blowing snow or freezing rain, heating systems shall be operated to prevent accumulation of snow or ice on the steps, landings, and skirt deflector devices. The heating systems operation shall be thermostatically controlled and independent of the escalator operation.
Drains suitable for all weather conditions shall be provided to prevent the accumulation of water where groundwater and runoff can collect within the equipment.
Landing plates and combplates shall be designed to provide a secure foothold when wet.
Floor openings for moving walks shall be protected against the passage of flame, heat, and/or smoke in accordance with the provisions of the applicable building code (see Part 9).
The sides and undersides of the moving walk truss or group of adjacent trusses in a single wellway shall be enclosed in materials defined as either noncombustible or limited-combustible by the building code or NFPA 101, whichever is applicable (see Part 9). Means provided for adequate ventilation of the driving machine and control spaces, when included in the truss enclosure area, shall be permitted.
The angle of inclination from the horizontal shall not exceed 3 deg within 900 mm (36 in.) of the entrance and egress ends and shall not exceed 12 deg at any point.
The width of the moving walk shall be the width of the exposed tread (see 6.2.3.7).
The height of the balustrade shall be not less than 900 mm (35 in.) nor more than 1 000 mm (39 in.) from the treadway to the top of handrail, measured perpendicular to the treadway surface.
The handrail shall be a minimum of 100 mm (4 in.) horizontally and 25 mm (1 in.) vertically away from adjacent surfaces, except that rounded fillets or beveled sides of the handrail stand are permitted to reduce the 25 mm (1 in.) clearance between the handrail and the point where the handrail stand is connected to the balustrade. The centerline of the handrail shall be not more than 240 mm (9.5 in.), measured horizontally, from the vertical plane through the edge of the exposed treadway (see Nonmandatory Appendix I, Fig. I-9).
Balustrades shall be installed on each side of the moving walk (see Nonmandatory Appendix I, Fig. I-7).

(a) The balustrade on the tread side shall have no areas or moldings depressed or raised more than 6.4 mm (0.25 in.) from the parent surface. Such areas or moldings shall have all boundary edges beveled or rounded.

(b) The balustrade shall be totally closed except:

(1) where the handrail enters the newel base (see 6.2.3.4.3).

(2) gaps between interior panels shall not be wider than 5 mm (0.19 in.). The edges shall be rounded or beveled.

(c) The width between the balustrade interior panels in the direction of travel shall not be changed.

Balustrades shall be designed to resist the simultaneous application of a static lateral distributed force of 585 N/m (40 lbf/ft) applied to the side of the handrail and a vertical distributed force of 730 N/m (50 lbf/ft) applied to the top of the handrail.
Glass or plastic, if used in balustrades, shall conform to the requirements of either of the following standards, whichever is applicable (see Part 9):

(a) ANSI Z97.1 or 16 CFR Part 1201

(b) one of the following CGSB Standards: CAN2-12.1, CAN2-12.11, or CAN2-12.12; except that there shall be no requirement for the panels to be transparent

Plastic bonded to basic supporting panels is not required to conform to these requirements.

The interior low deck, where provided, shall conform to the following (see Nonmandatory Appendix I, Fig. I-9):

(a) The width from the vertical face of the interior panel to the vertical plane of the skirt panel shall not exceed 150 mm (6 in.).

(b) The angle between the surface of the deck and the plane of the noseline of the treadway shall be not less than 20 deg nor more than 30 deg.

(c) A horizontal section shall be permitted immediately adjacent to the interior panel. It shall be not greater than 35 mm (1.25 in.).

On moving walks where the balustrade covers the edge of the treadway

(a) the clearance between the top surface of the treadway and the underside of the balustrade shall not exceed 6 mm (0.25 in.)

(b) the balustrade shall be vertical and smooth for at least 25 mm (1 in.) including the 6 mm (0.25 in.) clearance above the top of the tread

Where skirt panels are provided

(a) the clearance between each side of the treadway and the adjacent skirt panel shall be not more than 6 mm (0.25 in.)

(b) the height of the skirt above the top of the tread shall be at least 25 mm (1 in.), measured vertically

(c) skirt panels shall not deflect more than 1.6 mm (0.06 in.) under a force of 670 N (150 lbf)

(d) the exposed surface of the skirt panels adjacent to the tread shall be smooth

(a) On high deck balustrades, a solid guard shall be provided in the intersection of the angle of the outside balustrade deck and ceiling or soffit under either of the following conditions:

(1) where the clearance between the outside edge of the deck and the ceiling or soffit is 300 mm (12 in.) or less

(2) where the projected intersection of the outside deck and the ceiling or soffit is 600 mm (24 in.) or less from the centerline of the handrail

(b) On low deck balustrades, a solid guard shall be provided to protect the intersection formed by the top of the handrail and the plane of the ceiling or soffit where the centerline of the handrail is 350 mm (14 in.) or less from the ceiling or soffit.

(c) The vertical edge of the guard shall be a minimum of 350 mm (14 in.) in length.

(d) The moving walk side of the vertical face of the guard shall be flush with the face of the wellway.

(e) The exposed edge of the guard shall present a minimum width of 25 mm (1 in.) and a minimum radius of 12 mm (0.5 in.).

(f) Guards made of glass or plastic shall conform to the requirements of 6.2.3.3.3. See also Nonmandatory Appendix I, Fig. I-5.

(a) A barricade to restrict access to the outer deck on low deck exterior balustrades shall be provided on each moving walk when the exterior deck is greater than 915 mm (36 in.) above the floor in any part of its travel and the exterior deck width exceeds 125 mm (5 in.). On parallel abutting units, this protection shall be provided where the combined outer deck width exceeds 125 mm (5 in.). The barricade shall extend to a height that is nominally 100 mm (4 in.) below the top of the handrail.

(b) The barricades shall be located wherever the exterior deck exceeds the 915 mm (36 in.) height above the floor.

(c) On parallel adjacent moving walks, where the common low deck between adjacent interior panels exceeds 400 mm (16 in.), deck barricades should be spaced evenly along the treadway at not greater than 4.6 m (15 ft) measured on a line parallel to the direction of travel.

(d) Barricades made of glass or plastic shall conform to the requirements of 6.2.3.3.3.

All exposed barricade attachment fastener heads shall be of the tamper-resistant type.

Each balustrade shall be provided with a handrail moving in the same direction and at substantially the same speed as the treadway. The speed of the handrail shall not change when a retarding force of 450 N (100 lbf) is applied to the hand-rail opposite to the direction of travel.
The moving handrail at both the entrance and exit landings shall extend at normal height not less than 300 mm (12 in.) beyond the end of the exposed treadway. The point at which the moving handrail enters or leaves an enclosure shall be not more than 250 mm (10 in.) above the floor line.
Hand or finger guards shall be provided at points where the handrails enter the balustrade.
Splicing of handrails shall be done in such a manner that the joint is free of any pinching effect.
The horizontal clearance between either lip of the handrail and the handrail stand shall not exceed 10 mm (0.375 in.).
The treadway surface of each pallet shall be slotted in a direction parallel to its travel. Each slot shall be not more than 6.5 mm (0.25 in.) wide at the treadway surface and not less than 9.5 mm (0.375 in.) deep; and the distance from center to center of adjoining slots shall be not more than 9.5 mm (0.375 in.). Sides of the slots shall be permitted to slope for mold draft purposes and shall be permitted to be filleted at the bottom. Slots shall be so located on each side of the pallet to form a cleat adjacent to the skirt panel. (See Nonmandatory Appendix I, Fig. I-10.)
Alternate cleats on adjacent pallets shall intermesh so that there is no continuous transverse gap between adjacent pallets.
Adjacent ends of pallets shall not vary in elevation more than 1.6 mm (0.06 in.).
Each pallet width shall be subjected to the pallet fatigue test as described in 8.3.11.

(a) Pallet frames and treads, excluding their attachments or inserts, shall be metal, except that magnesium alloys shall not be used; or the materials, in their end-use configuration, shall have a flame spread index of 0 to 50, based on the tests conducted in accordance with the requirements of ASTM E84, UL 723, NFPA 255, or CAN/ULC-S102.2, whichever is applicable (see Part 9).

(b) Nonmetallic attachments and inserts (excluding wheels) shall be classified 94 HB or better, in accordance with ANSI/UL 94.

(c) Pallet treads shall afford a secure foothold.

Where support wheels are attached to the pallets and are not located within the width of the pallet, provision shall be made to prevent the pallet from falling into the moving walk interior due to a loss of one or more of the support wheel assemblies.
Belt-type treadways shall conform to 6.2.3.6.1 and 6.2.3.6.2.
Splicing of the treadway belt shall be made in such a manner as to result in a continuous unbroken treadway surface of the same characteristics as the balance of the belt.
The treadway surface shall be slotted in a direction parallel to its travel for purposes of meshing with combplates at the landings. Each slot shall be not more than 6.4 mm (0.25 in.) wide at the treadway surface and not less than 4.8 mm (0.188 in.) deep, and the distance from center to center of adjoining slots shall be not more than 13 mm (0.50 in.). Sides of slots shall be permitted to slope for mold draft purposes and shall be permitted to be filleted at the bottom. Slots shall be so located on each side of the belt to form a cleat adjacent to the skirt panel.
The width of a moving walk (see 6.2.3.2.1) shall be not less than 560 mm (22 in.). The maximum width shall depend both on the maximum slope at the point on the treadway and on the treadway speed. The width shall not exceed the value shown in Table 6.2.3.7.

Table 6.2.3.7 Treadway Width

Maximum Treadway, Slope at Any Point on Treadway, deg Maximum Moving Walk Treadway Width, mm (in.)
Maximum Treadway Speed, 0.45 m/s (90 ft/min) Treadway Speed, Above 0.45 m/s (90 ft/min) to 0.7 m/s (140 ft/min) Treadway Speed, Above 0.7 m/s (140 ft/min) to 0.9 m/s (180 ft/min)
0 to 4 Unrestricted 1 525 (60) 1 020 (40)
Above 4 to 8 1 020 (40) 1 020 (40) 1 020 (40)
Above 8 to 12 1 020 (40) 1 020 (40) Not permitted

(a) There shall be a combplate, to which combs shall be fastened, at the entrance and at the exit of every moving walk.

(b) The comb teeth shall be meshed with and set into the slots in the tread surfaces so that the points of the teeth are always below the upper surface of the treads.

(c) Combplates shall be adjustable vertically. Sections forming the comb teeth shall be readily replaceable.

(d) The comb section, combplate, and landing plate assemblies shall not make contact with the pallet or belt treadway surfaces when a weight of 160 kg (350 lb) is applied to any area 200 mm × 300 mm (8 in. × 12 in.) centered on the plates with the 300 mm (12 in.) dimension parallel to the direction of travel.

There shall be a visual contrast between the comb and tread, achieved by color, pattern, or texture.
The adjacent floor surfaces at each landing shall be continuous with the top of the landing plate, with no abrupt change in elevation of more than 6 mm (0.25 in.).
The entry and exit zones shall be kept clear of all obstacles. The width of the zones shall be not less than the width between the center-lines of the handrails plus 200 mm (8 in.). The length of the zones, measured from the end of the newel, shall be not less than twice the distance between the center-lines of the handrails. Space shall be provided to accommodate all traffic in the safety zone.

NOTE: These dimensions are absolute minimums.

Floor openings adjacent to the entire length of the moving walk wellway shall be provided with protection in accordance with the applicable building code (see Part 9).
Supports shall conform to the following:

(a) Slider-Bed Type. The carrying portion of the treadway shall be supported for its entire width and length, except where it passes from a support to a pulley. The surface of the slider bed shall be reasonably smooth. It shall be so constructed that it will not support combustion.

(b) Roller-Bed Type. Where the treadway is supported on a series of rollers, the combination of roller spacing, belt tension, and belt stiffness shall be such that the deflection of the treadway surface, midway between rollers, shall not exceed the quantity 0.25 mm (0.094 in.) plus 0.004 times the center-to-center distance of rollers in mm (in.) when measured as follows:

(1) The treadway surface shall be loaded midway between rollers with a 11.3 kg (25 lb) weight, concentrated on a cylindrical foot-piece 50 mm (2 in.) long by 25 mm (1 in.) in diameter, placed with its long axis across the belt. Deflection of this footpiece from its unloaded position shall not exceed the figure obtained above.

(2) The rollers shall be concentric and true running within commercially acceptable tolerances.

(c) Edge-Supported Belt Type. When the treadway belt is transversely rigid and is supported by rollers along its edges, the following requirements shall apply:

(1) With the belt tensioned through the take-up system, the permissible slope of a straight line from the top of a treadway rib adjacent to the centerline of the treadway to the top of a treadway rib adjacent to the balustrade, in a plane perpendicular to the path of the treadway, shall not exceed 3% when the treadway is loaded with a 68 kg (150 lb) weight on a 150 mm × 250 mm (6 in. × 10 in.) plate, located on the centerline of the treadway with the 250 mm (10 in.) dimension in the direction of treadway travel.

(2) In order to support the treadway in case of localized overload, supports shall be supplied at intervals not exceeding 1 830 mm (72 in.) along the centerline of the treadway. The supports shall be located at a level not more than 50 mm (2 in.) below the underside of the treadway when it is loaded under test conditions required by 6.2.3.9.1(c)(1).

(d) Pallet Type. Pallet wheel tracks shall be so designed and located as to prevent more than 3 mm (0.125 in.) vertical displacement of the treadway should the pallet connection means break.

For the purpose of structural design, the rated load shall be considered to be not less than the following:

(SI Units)

Structural rated load (kg) = D7 (W)A/1 000

(Imperial Units)

Structural rated load (lb) = D8 (W) A/12

where

A = length of the horizontal projection of the entire truss, m (ft)
D7 = Loading Factor = 490 kg/m2
D8 = Loading Factor = 100 lb/ft2
W = width of the moving walk, mm (in.) (see 6.2.3.2.1 and 6.2.3.7)

(a) For the purpose of driving machine and power transmission calculations, the rated load for all single driving machines shall be considered to be not less than the following:

(SI Units)

Machinery rated load (kg) = D9 (W)C1/1 000

(Imperial Units)

Machinery rated load (lb) = D10 (W)C1/12

(b) The rated load per module for two or more modular driving machines shall be considered to be not less than the following:

(SI Units)

Machinery rated load (kg) = D9 (W)C2/l 000

(Imperial Units)

Machinery rated load (lb) = D10 (W)C2/12

where

C1 = length of exposed treadway, m (ft)
C2 = length of exposed treadway per module, m (ft)
D9 = Loading Factor = 370 kg/m2
D10 = Loading Factor = 75.0 lb/ft2
W = width of the moving walk, mm (in.) (see 6.2.3.2.1 and 6.2.3.7)

(a) For the purpose of brake calculations, the rated load for all single driving machines shall be considered to be not less than the following:

(1) With moving walk stopped

(SI Units)

Brake rated load (kg) = D7 (W)C1/1 000

(Imperial Units)

Brake rated load (lb) = D8 (W)C1/12

(2) With moving walk running

(SI Units)

Brake rated load (kg) = D9 (W)C1/1 000

(Imperial Units)

Brake rated load (lb) = D10 (W)C1/12

(b) The rated load per module for two or more modular driving machines shall be considered to be not less than the following:

(1) with moving walk stopped

(SI Units)

Brake rated load (kg) = D7 (W)C2/1 000

(Imperial Units)

Brake rated load (lb) = D8 (W)C2/12

(2) with moving walk running

(SI Units)

Brake rated load (kg) = D9 (W)C2/l 000

(Imperial Units)

Brake rated load (lb) = D10 (W)C2/12

where

C1 = length of exposed treadway, m (ft)
C2 = length of exposed treadway per module, m (ft)
D7 = Loading Factor = 490 kg/m2
D8 = Loading Factor = 100 lb/ft2
D9 = Loading Factor = 370 kg/m2
D10 = Loading Factor = 75.0 lb/ft2
W = width of moving walk, mm (in.) (see 6.2.3.2.1 and 6.2.3.7)
The pallet shall be designed to support a load of 135 kg (300 lb) for each 0.42 m2 (4.5 ft2) of area, or part thereof. The load shall be applied on a 150 mm × 250 mm (6 in. × 10 in.) plate, placed on any part of the pallet with the 250 mm (10 in.) dimension in the direction of pallet travel. If more than one load is required, they shall be located no closer than 910 mm (36 in.) to each other.
Factors of safety are based on either single driving-machine design or modular driving-machine design. The factors of safety shall be at least as specified in 6.2.3.11.1 through 6.2.3.11.5.
Trusses and all supporting structures, including tracks, shall conform to the AISC Specifications for Design, Fabrication, and Erection of Structural Steel for Buildings, or the CSA Standard CAN/CSA-S16.1, whichever is applicable (see Part 9), based on the maximum static load calculated per 6.2.3.10.1.
For driving-machine parts based on not less than the loads calculated per 6.2.3.10.2:

(a) where made of steel or bronze, factor of safety shall be 8

(b) where made of cast iron or other materials, factor of safety shall be 10

For power transmission members, factor of safety shall be 10, based on not less than the loads calculated per 6.2.3.10.2.
For pallets, factor of safety shall be 5, based on not less than the loads designated in 6.2.3.10.4.
For belts, factor of safety shall be 5, based on not less than the loads designated in 6.2.3.10.2.
The use of chains with cast iron links shall not be permitted.
The load imposed on V-belt drives, when operating at the machinery rated load, shall not exceed the horsepower rating established by ANSI/RMA IP-20. The loading shall be considered to be uniform and the service to be 24 h per day.
The minimum headroom shall be 2 130 mm (84 in.) measured vertically from the treadway surface, landing plates, and landings.
Welding shall conform to 8.8.
Components not used directly in connection with the moving walk are prohibited to be installed on, in, or through the moving walk.
Permanent provisions shall be made to prevent accumulation of ground water in the pit. Drains and sump pumps, where provided, shall comply with the applicable plumbing code.
The maximum speed of a treadway shall depend on the maximum slope at any point on the treadway. The speed shall not exceed the value determined by Table 6.2.4.

Table 6.2.4 Treadway Speed

Maximum Treadway Slope at Any Point on Treadway, deg Maximum Treadway Speed, m/s (ft/min)
0 to 8 0.9 (180)
Above 8 to 12 0.7 (140)

The speed attained by a moving walk after start-up shall not be intentionally varied, except as permitted by 6.2.4.1.2.

Variation of the moving-walk speed after start-up shall be permitted, provided the moving-walk installation conforms to all of the following:

(a) The acceleration and deceleration rates shall not exceed 0.3 m/s2 (1.0 ft/sec2).

(b) The rated speed is not exceeded.

(c) The minimum speed shall be not less than 0.05 m/s (10 ft/min).

(d) The speed shall not automatically vary during inspection operation.

(e) Passenger detection means shall be provided at both landings of the moving walk such that

(1) detection of any approaching passenger shall cause the moving walk to accelerate to or maintain the full moving walk speed conforming to 6.2.4.1.2(a) through (d)

(2) detection of any approaching passenger shall occur sufficiently in advance of boarding to cause the moving walk to attain full operating speed before a passenger walking at normal speed [1.35 m/s (270 ft/min)] reaches the combplate

(3) passenger detection means shall remain active at the egress landing to detect any passenger approaching against the direction of moving walk travel and shall cause the moving walk to accelerate to full rated speed and sound the alarm (see 6.2.6.3.1) at the approaching landing before the passenger reaches the combplate

(f) Automatic deceleration shall not occur before a period of time has elapsed since the last passenger detection that is greater than 3 times the amount of time necessary to transfer a passenger between landings.

(g) Means shall be provided to detect failure of the passenger detection means and shall cause the moving walk to operate at full rated speed only.

The driving machine shall be connected to the main drive shaft by toothed gearing, a mechanical coupling, or a chain.
An electric motor shall not drive more than one moving walk driving machine. A driving machine shall not operate more than one moving walk.

(a) Each moving walk driving machine shall be provided with an electrically released and mechanically or magnetically applied brake. If the brake is magnetically applied, a ceramic permanent magnet shall be used. There shall be no intentional time delay designed into the application of the brake.

(b) The brake shall be applied automatically if the electrical power supply is interrupted. The brake shall be capable of stopping the down- or horizontal-running moving walk with any load up to the brake rated load [see 6.2.3.10.3(a)(2) or (b)(2)]. The brake shall hold the stopped moving walk with any load up to the brake rated load [see 6.2.3.10.3(a)(1) or (b)(1)].

(c) Driving-machine brakes shall stop the down- or horizontal-running moving walk treadway at an average rate not greater than 0.91 m/s2 (3 ft/s2) as measured over the total retardation time. No peak horizontal retardation value exceeding 0.91 m/s2 (3 ft/s2) shall have a time duration greater than 0.125 s (see Nonmandatory Appendix I, Fig. I-11).

(d) The moving walk brake shall be provided with a data plate that is readily visible, located on the machine brake and, when necessary, a duplicate data plate with the certification mark shall be placed adjacent to the machine brake. The data plate shall indicate

(1)(a) for fixed torque brakes, the range of brake torque that complies with 6.2.5.3.1, or

(1)(b) for variable torque brakes, the minimum brake torque for a loaded moving walk and the minimum stopping distance for the unloaded moving walk that complies with 6.2.5.3.1

(2) the method of measuring the torque, designated "BREAKAWAY" or "DYNAMIC," based on the method used when measuring the torque

(3) the location where the torque is to be measured, e.g., "MOTOR SHAFT," "MACHINE INPUT SHAFT," "MAIN DRIVE SHAFT"

(4) the type of brake as fixed or variable torque

(e) Where means other than a continuous shaft, mechanical coupling, or toothed gearing is used to connect the motor to a gear reducer, the moving walk driving-machine brake shall be located on the gear reducer, main drive shaft, or a specially attached braking surface attached directly to the treadway.

If the moving walk driving-machine brake is connected to the main drive shaft by a chain, and the moving walk, with the drive chain disconnected, is capable of running under gravity with any load up to and including rated load (see 6.2.3.10.2), a mechanically or magnetically applied brake capable of stopping a down-running moving walk with brake rated load (see 6.2.3.10.3) shall be provided on the main drive shaft or specially attached braking surface attached directly to the treadway. If the brake is magnetically applied, a ceramic permanent magnet shall be used.
Operating and safety devices conforming to 6.2.6 shall be provided. When more than one driving machine per moving walk is utilized, actuation of devices covered by 6.2.6 shall simultaneously control all driving machines.
Automatic starting by any means, or automatic stopping, except as required in 6.2.6, shall be prohibited.
Moving walks shall be provided with starting switch(es) conforming to the following:

(a) Location and Design. The switch(es) shall be

(1) located so that the exposed treadway is within sight.

(2) key operated, of the continuous-pressure spring-return type, and shall be operated by a cylinder-type lock having not less than a five-pin or five-disk combination.

(3) clearly and permanently marked "TOWARDS," "RUN," and "AWAY," in that order, with the key removable only in the "RUN" (spring return) position. The switch(es) shall be rotated clockwise to go from the "TOWARDS" to "RUN" to "AWAY" position.

(b) Operating Requirements. The operation of the switch(es) shall initiate movement of the moving walk. The moving walk shall not start (restart) unless all starting switch(es) were first in the "RUN" position.

(c) The starting switch(es) shall be located within reach of an emergency stop button (see 6.2.6.3.1).

(d) The key shall be of Group 2 Security (see 8.1).

Each moving walk shall be equipped with inspection controls not accessible to the general public during normal operation to provide constant pressure operation during maintenance, repair, or inspection by means of a manually operated control device.

(a) General Requirements

(1) Switches for transferring the control of the moving walk to inspection operation shall be provided or a switch shall be provided at each landing in a portable control station; the switch(es) shall function as follows:

(a) be through a contact that shall be positively opened mechanically and whose opening shall not depend solely on springs

(b) be manually operated

(c) be labeled "INSPECTION"

(d) have two positions, labeled "INSPECTION" or "INSP" and "NORMAL" or "NORM"

(e) when in the "INSPECTION" position, it shall cause the movement of the moving walk to be solely under the control of constant pressure operating devices at that landing or in that portable control station

(f) be arranged so that if more than one inspection transfer switch is in the "INSPECTION" position, then all constant pressure operating devices at all locations shall be inoperative

(g) be protected against accidental contact

(2) Constant pressure operating devices shall

(a) allow movement of the moving walk only by constant application of manual pressure

(b) be distinctly recognizable from indications on the device as to the direction of travel controlled

(c) be protected against accidental contact

(d) be located so that the moving walk treadway surface is within sight

(3) A stop switch conforming to 6.2.6.3.12 shall be provided adjacent to the constant pressure operating devices.

(4) When portable control stations are used, the cord length shall not exceed 3 000 mm (120 in.) in length.

(b) Plug-in Portable Control Station. A plug-in portable control station shall be permitted provided that

(1) either a transfer switch conforming to 6.2.6.2.2(a)(1)(a), (a)(1)(b), and (a)(1)(c) is complied with, or when plugged in, the moving walk shall automatically transfer to inspection operation

(2) when the switch, if provided, is in the "INSPECTION" position, or when the control station is plugged in, it shall cause the movement of the moving walk to be solely under the control of constant pressure operating devices contained in the portable unit

(3) the plug-in portable control station is stored at the upper landing machinery space

Electrical protective devices shall be provided in accordance with 6.2.6.3.1 through 6.2.6.3.12.

(a) Location. A red stop button shall be visibly located at the top and the bottom landings on the right side facing the moving walk. In jurisdictions not enforcing NBCC, remote stop buttons are prohibited. In jurisdictions enforcing NBCC, if remote buttons are provided, they shall be located within view of the moving walk.

(1) On high deck balustrades, they shall be located on the curved newel deck in the upper quadrant, with the centerline of the button at a 45 deg angle from the horizontal.

(2) On low deck balustrades, they shall be located below the handrail height. The centerline of the button shall be located on a radial line 45 deg above the horizontal, such that no part of the button assembly is within 38 mm (1.5 in.) of the bottom of the handrail and the button is no more than 90 mm (3.5 in.) from the bottom of the handrail.

(b) Cover, Alarm, and Marking. The buttons shall be covered with a transparent cover that can be readily lifted or pushed aside. When the cover is moved, an audible warning signal shall be activated. The signal shall have a sound intensity of 80 dBA minimum at the button location. The cover shall be marked "EMERGENCY STOP," "MOVE COVER" or equivalent legend (e.g., "LIFTCOVER," "SLIDE COVER," etc.), and "PUSH BUTTON." "EMERGENCY STOP" shall be in letters not less than 13 mm (0.5 in.) high. Other required wording shall be in letters not less than 4.8mm (0.188 in.) high. The cover shall be self-resetting.

(c) Operation. The operation of either of these buttons shall cause the electric power to be removed from the moving walk driving-machine motor and brake. It shall not be possible to start the moving walk by these buttons.

A moving-walk speed-monitoring device shall be provided.

(a) The operation of the device shall cause the electric power to be removed from the driving-machine motor and brake should the speed exceed the rated speed by more than 20%.

(b) The device shall be of the manual-reset type.

A broken treadway device shall be provided that shall cause the electric power to be removed from the driving-machine motor and brake if the connecting means between the pallets or the belt breaks. The device shall be of the manual-reset type.
When the driving machine is connected to the main drive shaft by a chain, a device shall be provided that will cause the application of the brake on the main drive shaft and also cause the electric power to be removed from the driving-machine motor and brake if the drive chain between the machine and the main drive shaft becomes disengaged from the sprockets. The device shall of the manual-reset type.
A stop switch conforming to the following requirements shall be provided in each machinery space and other spaces where means of access to the interior space is provided (see 6.2.7.3), except for the machinery space where the main line disconnect switch is located:

(a) when opened ("STOP" position), cause the electric power to be removed from the moving walk driving-machine motor and brake

(b) be of the manually opened and closed type

(c) have red operating handles or buttons

(d) be conspicuously and permanently marked "STOP," and shall indicate the "STOP" and "RUN" positions

(e) shall have contacts that are positively opened mechanically and their opening shall not be solely dependent on springs

Egress restrictors, if used, that would prevent the free and continuous exiting of passengers, shall provide a signal to a device on the moving walk that shall cause the electric power to be removed from the moving walk driving-machine motor and brake when the exit restrictors begin to close.
Means shall be provided to cause the electric power to be removed from the driving-machine motor and brake in case of reversal of travel while the moving walk is operating in the ascending direction. The device shall be of the manual-reset type.
If the drive motor is attached to a gear reducer by means other than a continuous shaft, mechanical coupling, or toothed gearing, a device shall be provided that will cause the electric power to be removed from the driving-machine motor and brake (see 6.2.5.3.1) if the motor becomes disconnected from the gear reducer. The device shall be of the manual-reset type.
Moving walks equipped with pallets with trail wheels shall be provided with pallet level devices located at the top and bottom of the moving walk. These devices shall detect downward displacement of 3 mm (0.125 in.) or greater at either side of the trailing edge of the pallet. When activated, the device shall cause the moving walk to stop before the pallet enters the combplate. The device shall cause the power to be removed from the driving-machine motor and brake. Devices shall be of the manual-reset type.
A handrail entry device shall be provided at each newel. It shall be operative in the newels in which the handrail enters the balustrade. It shall cause the moving walk to stop by removing power from the driving-machine motor and brake. It shall operate in either of two ways

(a) if an object becomes caught between the handrail and the handrail guard

(b) if an object approaches the area between the hand-rail and handrail guard

For those units that rely on an opening of the balustrade to prevent entrapment, all handrail entry devices shall be operative whenever the handrails are operating. The device shall be of the manual reset type or it shall be permitted to automatically reset not more than one time within 24 hr of operation and thereafter require a manual reset before the next restart. Interruption of power during operation should not cause the device to lose the status of the timer nor the count of events.

Devices shall be provided that will cause the opening of the power circuit to the moving walk driving-machine motor and brake if either

(a) a horizontal force not greater than 1 780 N (400 lbf) in the direction of travel is applied at either side, or not greater than 3 560 N (800 lbf) at the center of the front edge of the comb-plate; or

(b) a resultant vertical force not greater than 670 N (150 lbf) in the upward direction is applied at the center of the front of the combplate.

These devices shall be of the manual-reset type.

A stop switch conforming to the following requirements shall be provided when required by 6.2.6.2.2:

(a) when opened ("STOP" position), cause the electric power to be removed from the moving walk driving-machine motor and brake

(b) be of the manually opened and closed type

(c) have red operating handles or buttons

(d) be conspicuously and permanently marked "STOP," and shall indicate the "STOP" and "RUN" positions

(e) shall have contacts that are positively opened mechanically and their opening shall not be solely dependent on springs

A handrail speed monitoring device shall be provided that will cause the activation of the alarm required by 6.2.6.3.1(b) without any intentional delay whenever the speed of either handrail deviates from the treadway speed by 15% or more. The device shall also cause electric power to be removed from the driving-machine motor and brake when the speed deviation of 15% or more is continuous within a 2 s to 6 s range. The device shall be of the manual reset type or it shall be permitted to automatically reset not more than one time within 24 hr of operation and thereafter require a manual reset before the next restart. Interruption of power during operation should not cause the device to lose the status of the timer nor the count of events.
A device shall be provided to detect a missing pallet and bring the moving walk to a stop before the gap resulting from the missing pallet emerges from the comb. The device shall cause power to be removed from the driving-machine motor and brake. The device shall be of the manual-reset type.
Tandem-operation moving walks shall be electrically interlocked where traffic flow is such that bunching will occur if the moving walk carrying passengers away from the intermediate landing stops.

The electrical interlocks shall stop the moving walk carrying passengers into the common intermediate landing if the moving walk carrying passengers away from the landing stops. These moving walks shall also be electrically interlocked to assure that they run in the same direction.

Smoke detectors shall be permitted, which shall activate the alarm required by 6.2.6.3.1(b) and, after at least 15 s, shall cause the interruption of power to the driving-machine motor and brake.
A caution sign shall be located at the top and bottom landings of each moving walk, readily visible to the boarding passengers.

The sign shall include the following wording:

(a) "Caution"

(b) "Passengers Only"

(c) "Hold Handrail"

(d) "Attend Children"

(e) "Avoid Sides"

The sign shall be standard for all moving walks and shall be identical in format, size, color, wording, and pictorials as shown in Fig. 6.1.6.9.1.

The sign shall be durable and have a maximum thickness of 6.4 mm (0.25 in.) with rounded or beveled corners and edges.

Signs or graphics relating to safety shall not be permitted on the moving walk in such a manner nor adjacent to the moving walk in such a manner that obstructs boarding passenger view of the signs required in 6.2.6.8.1, physically obstructs passenger flow at the landings as specified in the safety zone (see 6.2.3.8.4), nor obstructs or reduces passenger access to the handrails. They shall be legible and not be distracting, create passenger flow hazards, or impair function of safety devices.
Signs or graphics other than those specified in 6.2.6.8.1 and 6.2.6.8.2 shall not be permitted adjacent to the walk in such a manner that obstructs boarding passenger view of the signs required in 6.2.6.9.1, obstructs or reduces passenger access to the handrails, within the safety zone, nor on the moving walk except for signs, graphics, or markings required by this Code, manufacturer's identification, owner's identification, and handrail signs or graphics that are permitted on the moving walk. They shall not be distracting, create passenger flow hazards, or impair function of safety devices.
The design and installation of the control and operating circuits shall conform to 6.2.6.9.1 through 6.2.6.9.4.
The occurrence of a single ground or the failure of any single magnetically operated switch, contactor, or relay; or any single solid-state device; or a software system failure shall not

(a) permit the moving walk to start

(b) render ineffective any electrical protective device required by 6.2.6.3

(c) render ineffective the handrail speed-monitoring device required by 6.2.6.4

(d) render ineffective the missing-pallet device required by 6.2.6.5

(e) permit the moving walk to revert to normal operation when on inspection operation (see 6.2.6.2.2)

NOTE [6.2.6.9.1(b) through (d)]: Requirements apply only to the circuits in which the devices are used and not to the devices themselves.

Methods used to satisfy 6.2.6.9.1 using software systems are permitted, provided that a nonsoftware-controlled means is also used to remove power from the driving-machine motor and brake.
Methods used in the control and operating circuits to satisfy the requirements of 6.2.6.9.1 shall be checked prior to each start of the moving walk. When a single ground or failure as specified in 6.2.6.9.1 occurs, the moving walk shall not be permitted to restart.
Moving walks with driving-machine motors employing static control shall conform to the following:

(a) Two devices shall be provided to remove power from the driving-machine motor. At least one device shall be an electromechanical contactor.

(1) The contactor shall be arranged to open each time the moving walk stops.

(2) The contactor shall cause the removal of power from the driving-machine brake in accordance with 6.2.6.3.4.

(b) An additional contactor shall be provided to also open the driving-machine brake circuit. This contactor is not required to have contacts in the driving-rnachine motor circuit.

(c) The electrical protective devices required by 6.2.6.3 shall control the solid-state device and both contactors.

(d) After each stop of the moving walk, the moving walk shall not respond to a signal to start unless both contactors [see 6.2.6.9.4(a) and (b)] are in the de-energized position.

If the handrail-speed monitoring device required by 6.2.6.4, the missing pallet device, required by 6.2.6.5, or any electrical protective device required by 6.2.6.3, requires electrical power for its functioning

(a) a loss of electrical power to the device shall cause power to be removed from the moving walk driving-machine motor and brake

(b) the occurrence of a single ground or the failure of any single magnetically operated switch, contactor, or relay; or any single solid-state device; or a software system failure, shall not render the missing pallet device or handrail speed monitoring device or electrical protective device inoperative

(c) when a single ground or failure as described in 6.2.6.10.2 occurs, the moving walk shall not be permitted to restart

The installation of capacitors, or other devices, the operation or failure of which will cause an unsafe operation of the moving walk, is prohibited. No permanent device shall be installed, except as provided for in this Code, which will make any required electrical protective device ineffective.
The completion or maintenance of an electric circuit shall not be used to stop the moving walk when the emergency stop switch is opened or when any of the electrical protective devices operate. These requirements do not apply to electrically assisted braking or speed control switches (see 6.2.6.3.2, 6.2.6.3.7, and 6.2.6.4).
Where manual reset is required, interruption of power to the moving walk shall not cause a safety device to lose the status of the event upon return of power. The cause of the malfunction shall be indicated in some manner, so that an examination will be made prior to restarting the moving walk. The starting switch shall not be operable until the reset for each activated safety device is accomplished.
Where electromechanical contactors or relays are provided to fulfill the requirements of 6.2.6.9.1 through 6.2.6.9.4, they shall be considered to be used in critical operating circuits. If the contact(s) on these electromechanical contactors or relays is used for monitoring purposes, it shall be prevented from changing state if the contact(s) utilized in a critical operating circuit fails to open in the intended manner. The monitoring contact(s) shall be positively actuated and shall not be solely dependent upon springs.
Permanent electric lighting and a duplex receptacle rated at not less than 15 A, 120 V shall be provided in every remote machine room.

The illumination shall be not less than 100 lx (10 fc) at the floor level. The lighting control switch shall be located within easy reach of the access to such rooms and so located that it can be operated without passing over or reaching over any part of the machinery

A duplex receptacle rated at not less than 15 A 120 V accessibly located, shall be provided under the access plates (see 6.2.7.3) at both landings and in any machine areas located within the moving walk.
Treadways shall be illuminated with a light intensity of not less than 50 lx (5 fc). The illumination shall be of uniform intensity and should not contrast materially with that of the surrounding area.
Reasonable access to the interior of the moving walk shall be provided for inspection and maintenance.
Access plates requiring no more than 310 N (70 lbf) of effort to open shall be provided at the top and bottom landings for inspection and maintenance. The plates shall be made of a material that will afford a secure foothold. The use of stone, terrazzo, or concrete as a fill material is prohibited within the confines of the moving walk truss.
Access plates at the top and bottom landings shall be securely fastened by a mechanical means.
If access doors are provided in the side of the moving walk enclosure, they shall be kept closed and locked. The key shall be removable only when in the locked position. The key shall be of Group 2 Security (see 8.1).
Where access is provided to a machinery enclosure, a fixed guard shall be provided to prevent accidental contact with the moving pallets and moving treadways by a person servicing equipment from within the enclosure. The guard shall be made of material that will reject a 13 mm (0.5 in.) diameter ball and shall extend the full width of the pallet treads. A guard is not required where the only equipment normally serviced from within the enclosure is within the pallet band.
All electrical equipment and wiring shall conform to NFPA 70 or CSA-C22.1, whichever is applicable (see Part 9). In jurisdictions enforcing CSA-C22.1, power supply-line disconnecting means shall not be opened automatically by a fire alarm system.
Electrical equipment shall be listed/certified and labeled/marked. CSA-B44.1/ASME A17.5 defines the scope and applicable requirements for this listing/certification.
Control equipment shall be tested in accordance with the testing requirements of EN 12016 by exposing it to interference levels at the test values specified for "safety circuits." The interference shall not cause any of the conditions described in 6.2.6.9.1(a) through (e). If enclosure doors or suppression equipment must remain installed to meet the above requirements, warning signs to that effect shall be posted on the control equipment.
Moving walks shall be so constructed that exposure to the weather will not interfere with normal operation.
The moving walk equipment and its supports shall be protected from corrosion.
Electrical equipment shall be provided with a degree of protection of at least Type 4 construction as specified in NEMA 250, and wiring shall be identified for use in wet locations in accordance with NFPA 70 or CSA-C22.1 as applicable (see Part 9).
A cover, directly over the horizontal projection of the moving walk, shall be provided. The cover shall extend outward from the centerline of the handrail so that a line extended from the edge of the cover to the centerline of the handrail forms an angle of not less than 15 deg from the vertical.
When the moving walk is subjected to blowing snow or freezing rain, heating systems shall be operated to prevent accumulation of snow or ice on the treadway and landings. The heating systems operation shall be thermostatically controlled and independent of the moving walk operation.
Drains suitable for all weather conditions shall be provided to prevent the accumulation of water where groundwater and runoff can collect within the equipment.
Landing plates and comb-plates shall be designed to provide a secure foothold when wet.
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