In jurisdictions enforcing NBCC, the controller shall be permitted to be located on the exterior of the hoistway wall or other approved location apart from the hoistway, elevator machine room, or elevator machinery space. If the controller is located outside the hoistway, machine room, and machinery spaces, it shall be made accessible only to elevator personnel.
Electrical equipment, wiring, pipes, and ducts in the hoistway shall conform to 2.8, except that the main feeder of a rack-and-pinion machine located on the car shall be permitted to be installed in the hoistway.
The supports and foundations shall be designed to support all loads imposed by the elevator (including impact loading in the event of a safety application, stop by a speed-limiting device, or drive nut failure) in accordance with the building code. Allowable stresses for machinery and sheave beams or floors and their supports shall be in accordance with 2.9.4.
The car shall be provided with a safety identified in 2.17.5 or a rack-and-pinion safety. The safety shall be attached to the car frame or supporting structure. All car safeties shall be mounted on a single car frame and shall operate on one pair of guide members or on one vertical rack.
The safety shall be located as required by 2.17.1, or if it is a rack-and-pinion safety, shall be permitted to be located above or in the car, provided that the members to which they are fixed are part of the car frame and are designed to withstand the forces imposed.
Rack-and-pinion safeties are safeties in which a freely rotating safety pinion, a governor, and a safety device shall be permitted to form an integral unit mounted in the car. The freely rotating pinion travels on a stationary rack mounted vertically on the hoist structure. The rotating pinion drives the governor. When the speed of the car reaches the tripping value, the rotating governor actuates the safety device that, in turn, brings the car to a gradual stop.
Table 18.104.22.168 Maximum and Minimum Stopping Distances for Rack-and-Pinion Safeties With Rated Load
|SI Units||Imperial Units|
|Rate Speed, m/s||Maximum Governor Trip Speed, m/s||Stopping Distance, mm||Rated Speed, ft/min||Maximum Governor Trip Speed, ft/min||Stopping Distance, in.|
|2.54||3.17||1 027.1||3 098.8||500||625||40.44||122.00|
|3.04||3.75||1 439.9||4 101.5||600||740||56.69||161.48|
|3.55||4.34||1 922.3||4 975.0||700||855||75.68||195.87|
|4.06||4.92||2 473.9||5 974.5||800||970||97.40||235.22|
|4.57||5.51||3 095.4||7 100.0||900||1,085||121.87||279.53|
|5.06||6.09||3 786.3||8 305.8||1,000||1,200||149.07||327.00|
|5.58||6.70||4 581.4||9 791.7||1,100||1,320||180.37||385.50|
|6.09||7.31||5 452.3||11 379.2||1,200||1,440||214.66||448.00|
|6.60||7.92||6 400.8||13 083.5||1,300||1,560||252.00||515.10|
|7.11||8.53||7 421.1||14 935.2||1,400||1,680||292.17||588.00|
|7.62||9.14||8 068.3||16 924.0||1,500||1,800||333.40||666.30|
|8.12||9.75||9 642.8||19 050.0||1,600||1,920||381.61||750.00|
|8.63||10.36||10 942.3||21 313.1||1,700||2,040||430.80||839.10|
|9.14||10.97||12 266.4||23 713.4||1,800||2,160||482.98||933.60|
|9.65||11.58||13 668.7||26 750.9||1,900||2,280||538.14||1,053.50|
|10.16||12.19||15 145.2||28 925.5||2,000||2,400||596.27||1,138.80|
In jurisdictions enforcing NBCC, stopping distances for rack-and-pinion safeties and the travel of the car measured from the governor tripping time to the full stop time shall not exceed the values based on rated speed given in Table 22.214.171.124. When calculating stopping distances, the kinetic energy from the driving unit shall be taken into account.
Guide rails, guide-rail supports, and their fastenings shall conform to 2.23.
Where the rack-and-pinion machine and its controller are located on the car, the disconnecting means shall be located adjacent to the controller. Auxiliary disconnect means shall be provided at the main landing whenever the main power supply disconnect means (required by NFPA 70 or CSA-C22.1, as applicable; see Part 9) is mounted adjacent to the controller on the car. Auxiliary disconnect means shall be accessible to authorized personnel only in order to be available for their protection and emergency use.
Emergency operation and signal service shall conform to 2.27.
Elevator layout drawings shall, in addition to the other data required by 2.28, indicate
(a) the dimensions of the rack and location with respect to the guide rail
(b) the magnitude of the loads on the rack imposed on the building structure
(a) the top car runby
(b) the height of the refuge space on top of the enclosure (see 126.96.36.199) or the clearance required for equipment projecting above the top of the car to prevent its striking any part of the overhead structure or equipment located in the hoistway, but in no case less than 1 070 mm (42 in.)
Electrical wiring, pipes, and ducts in hoistways, machine rooms, and machinery spaces shall conform to 2.8, except, the main feeder of a screw-column elevator shall be permitted to be installed in the hoistway if the screw machine is located in the hoistway, provided there is no intermediate access to the conductors between the disconnecting means and the termination at the motor or controller.
(a) AISC Book No. S326 or CAN/CSA-S16.1, whichever is applicable (see Part 9) for structural steel
NOTE: In determining unit stresses, the maximum normal loading is doubled to take care of impact, accelerating stresses, etc.
(a) limit the down speed of the car with rated load to not over 0.87 m/s (175 ft/min) in the event of failure of the driving means; or
(b) limit the fall of the elevator in the event of failure of the driving nut to a distance not exceeding 13 mm (0.5 in.), by utilizing a safety nut or other equivalent means.
(a) date of installation of driving and safety nuts
(b) spacing between driving and safety nuts
The fastening of guide rails to brackets or to the elevator-supporting frame shall be by clips, welds, or bolts. The rail structure and the structural members to which it is attached shall withstand the forces specified in 188.8.131.52, and the application of the car safety shall be within the deflection limits specified.
|A||= net cross-sectional area of screw at root of thread, mm2 (in.2)|
|L||= maximum free length of screw, mm (in.)|
|R||= radius of gyration of screw at root of thread, mm (in.)|
|W||= the total weight with rated load plus one-half the weight of the screw column, kg (lb)|
|W/A||= maximum allowable fiber stress|
Elevators having a rated speed of 0.5 m/s (100 ft/min) or less shall be designed so that the elevator car will be brought to a stop without damage to the elevator system in the event of overtravel of the elevator at either terminal due to a malfunction.
(b) Requirement 184.108.40.206, Inspection Operation, except that a top-of-car operating devices are not required on private residence elevators and special purpose personnel elevators. Top-of-car operating devices are not required on any screw-column elevator if there is no mechanical or electrical equipment that requires maintenance from the top of the car.
(d) Requirement 2.26.3, Contactors and Relays in Critical Operating Circuits.
(e) Requirement 2.26.4, Requirements of Electrical Equipment and Wiring.
(h) Requirement 2.26.6, Phase Protection of Motors.
(k) Requirement 2.26.9, Control and Operating Circuits.
(m) Requirement 2.26.13, Operating Device Symbols.
Emergency operation and signaling devices shall conform to 2.27.
|2.1.3||Floor Over Hoistways|
|2.1.6||Projections, Recesses, and Setbacks in Hoistway Enclosures|
|2.3||Location and Guarding of Counterweights|
|2.4||Vertical Clearances and Runbys for Cars and Counterweights|
|2.5||Horizontal Car and Counterweight Clearances|
|2.7.2||Maintenance Path and Clearance|
|2.7.4||Headroom in Machinery Spaces, Machine Rooms, Control Spaces, and Control Rooms|
|220.127.116.11||Temperature and Humidity|
|2.8||Equipment in Hoistways, Machinery Spaces, Machine Rooms, Control Spaces, and Control Rooms|
|2.10||Guarding of Equipment and Standard Railing|
|2.11.3||Closing of Hoistway Doors|
|2.11.7||Glass in Hoistway Doors|
|2.11.9||Hoistway Door Locking Devices and Power Operation|
|2.12||Hoistway Door Locking Devices and Electric Contacts, and Hoistway Access Switches|
|2.13||Power Operation of Hoistway Doors and Car Doors|
Pits are not required.
(a) self-closing or manually operated horizontally sliding or swinging, single section
(b) self-closing or manually operated horizontally swinging, two section (Dutch type) with one section above the other and the lower section extending not less than 1 070 mm (42 in.) above the floor, and arranged to be opened only when the car is in the landing zone and after the upper section has been opened, and to be closed by the closing of the upper section
(c) manually operated vertically sliding counterweighted single- or multi-section
(d) manually operated vertically sliding biparting counterbalanced
Manually operated doors shall be equipped with approved devices to close them automatically when released by the action of heat. Self-closing doors equipped with hold-open devices shall be equipped with fusible links that will release the door in case of excessive heat.
Landing doors shall be provided with mechanical locks so arranged that the car cannot leave the landing unless the door is closed. The lock or latch shall be arranged to ensure that the door is in a position to be locked when or before the car leaves the landing.
Hoistway landing openings equipped with horizontally sliding or swinging doors shall also be provided with vertically sliding semiautomatic gates, not less than 1 070 mm (42 in.) high and of a design that will reject a ball 50 mm (2 in.) in diameter. Gates shall be so constructed and guided as to withstand a lateral force of 445 N (100 lbf) concentrated at the center of the gate without being deflected beyond the line of the landing sill, and a force of 1 112 N (250 lbf) without forcing the gate from its guides or without causing it to break or be permanently deformed.
(b) General Design Requirements. The lock shall hold the gate in the closed position by means of gravity or by a restrained compression spring, or by both.
(c) Closed Position. Hoistway gates provided with hoistway gate separate mechanical locks shall be considered to be in the closed position when the gate is within 10 mm (0.375 in.) of contact with the landing sill.
Cars shall be enclosed on the sides not used for entrance. The deflection of the enclosure shall be not more than 6 mm (0.25 in.) when subjected to a force of 334 N (75 lbf) applied perpendicularly to the car enclosure at any point. The enclosure shall be secured to the car platform or frame in such a manner that it cannot work loose or become displaced in ordinary service.
These requirements do not apply to sidewalk elevators.
Car frames and platforms shall be of metal or sound seasoned wood designed with a factor of safety of not less than 4 for metal and 6 for wood, based on the rated load uniformly distributed. Connection between frame members of the car frame and the platform shall be riveted, bolted, or welded.
Elevator cars upon which an operator is permitted to ride shall have not more than one compartment.
Elevator cars upon which persons are permitted to ride shall not be arranged to counterbalance each other.
(a) rated load in kg (lb)
(b) the maximum number of passengers to be carried based on 68 kg (150 lb) per person (if passenger elevator)
(c) suspension data required by 18.104.22.168
The car safety device is not required to be operated by a speed governor, and is permitted to be of the instantaneous type operated as a result of the breaking or slackening of the suspension members.
(a) the guide rails and their fastenings shall not deflect more than 6 mm (0.25 in.) under normal operation
(b) the guide rails and their fastenings shall withstand the application of the safety, where provided, when stopping the car with rated load or when stopping the counterweight