Informational Note: Sign and outline lighting illumination systems include, but are not limited to, cold cathode neon tubing, high-intensity discharge lamps (HID), fluorescent or in candescent lamps, light-emitting diodes (LEDs), and electroluminescent and inductance lighting.
LED Sign Illumination System. A complete lighting system for use in signs and outline lighting consisting of light-emitting diode (LED) light sources, power supplies, wire, and connectors to complete the installation.
Neon Tubing. Electric-discharge luminous tubing, including cold cathode luminous tubing, that is manufactured into shapes to illuminate signs, form letters, parts of letters, skeleton tubing, outline lighting, other decorative elements, or art forms and filled with various inert gases.
Section Sign. A sign or outline lighting system, shipped as subassemblies, that requires field-installed wiring between the subassemblies to complete the overall sign. The subassemblies are either physically joined to form a single sign unit or are installed as separate remote parts of an overall sign.
Exception No. 1: A disconnecting means shall not be required for an exit directional sign located within a building.
- The disconnecting means shall be located within sight of the controller or in the same enclosure with the controller.
- The disconnecting means shall disconnect the sign or outline lighting system and the controller from all ungrounded supply conductors.
- The disconnecting means shall be designed such that no pole can be operated independently and shall be lockable in accordance with 110.25.
Exception: Portable cord-connected signs shall not be required to be connected to the equipment grounding conductor where protected by a system of double insulation or its equivalent. Double insulated equipment shall be distinctively marked.
The spacing between wood or other combustible materials and an incandescent or HID lamp or lampholder shall not be less than 50 mm (2 in.).
II Field-Installed Skeleton Tubing, Outline Lighting, and Secondary Wiring
- Support wiring shall be installed in a neat and workmanlike manner. Cables and conductors installed exposed on the surface of ceilings and sidewalls shall be supported by the building structure in such a manner that the cable is not be damaged by normal building use. Such cables shall be supported by straps, staples, hangers, cable ties, or similar fittings designed and installed so as not to damage the cable. The installation shall also comply with 300.4(D).
- Connections in cable and conductors shall be made with listed insulating devices and be accessible after installation. Where made in a wall, connections shall be enclosed in a listed box.
Manufactured Wiring System. A system containing component parts that are assembled in the process of manufacture and cannot be inspected at the building site without damage or destruction to the assembly and used for the connection of luminaires, utilization equipment, continuous plug-in type busways, and other devices.
Exception No. 2: Manufactured wiring system assemblies installed outdoors shall be listed for use in outdoor locations.
- Listed Type AC cable containing nominal 600-volt, 8 to 12 AWG insulated copper conductors with a bare or insulated copper equipment grounding conductor equivalent in size to the ungrounded conductor.
- Listed Type MC cable containing nominal 600-volt, 8 to 12 AWG insulated copper conductors with a bare or insulated copper equipment grounding conductor equivalent in size to the ungrounded conductor.
- Listed Type MC cable containing nominal 600-volt, 8 to 12 AWG insulated copper conductors with a grounding conductor and armor assembly listed and identified for grounding in accordance with 250.118(10). The combined metallic sheath and grounding conductor shall have a current-carrying capacity equivalent to that of the ungrounded copper conductor.
Exception No. 1 to (1) and (2): A luminaire tap, no longer than 1.8 m (6 ft) and intended for connection to a single luminaire, shall be permitted to contain conductors smaller than 12 AWG but not smaller than 18 AWG.
Exception No. 2 to (1) and (2): Listed manufactured wiring assemblies containing conductors smaller than 12 AWG shall be permitted for remote-control, signaling, or communication circuits.
Exception No. 3 to (2): Listed manufactured wiring systems containing unlisted flexible metal conduit of noncircular cross section or trade sizes smaller than permitted by 348.20(A), or both, shall be permitted where the wiring systems are supplied with fittings and conductors at the time of manufacture.
Office Furnishing. Cubicle panels, partitions, study carrels, workstations, desks, shelving systems, and storage units that may be mechanically and electrically interconnected to form an office furnishing system.
Exception: Where permitted by the authority having jurisdiction, these relocatable wired partitions shall be permitted to extend to, but shall not penetrate, the ceiling.
- The cord is extra-hard usage type with 12 AWG or larger conductors, with an insulated equipment grounding conductor.
- The office furnishings are mechanically contiguous.
- The cord is not longer than necessary for maximum positioning of the office furnishing but is in no case to exceed 600 mm (2 ft).
- The cord is terminated at an attachment plug-and-cord connector with strain relief.
- The cord length shall be suitable for the intended application but shall not exceed 2.7 m (9 ft) in length.
- The cord shall not be smaller than 18 AWG.
- The cord shall contain an equipment grounding conductor, except as specified in 605.6(B)(4).
- Cords on the load side of a listed Class 2 power source shall not be required to contain an equipment grounding conductor.
- The cord shall be of the hard usage type, except as specified in 605.6(B)(6).
- A cord provided on a listed Class 2 power source shall be of the type provided with the listed luminaire assembly or of the type specified in 725.130 and 725.127.
- Connection by other means shall be identified as suitable for the conditions of use.
Informational Note: For further information, see ANSI B30, Safety Code for Cranes, Derricks, Hoists, Jacks, and Slings.
Informational Note: Festoon cable consists of one or more insulated conductors cabled together with an overall jacket. It is rated 60°C (140°F), 75°C (167°F), 90°C (194°F), or 105°C (22I°F) and 600 V.
|Maximum Operating Temperature||Up to Four Simultaneously Energized Conductors in Raceway or Cable1||Up to Three ac2 or Four dc1 Simultaneously Energized Conductors in Raceway or Cable||Maximum Operating Temperature|
|75°C (167°F)||90°C (194°F)||125°C (257°F)|
|Size (AWG or kcmil)||Types MTW, RHW, THW, THWN, XHHW, USE, ZW||Types TA, TBS, SA, SIS, PFA, FEP, FEPB, RHH,THHN, XHHW, Z, ZW||Types FEP, FEPB, PFA, PFAH, SA, TFE, Z, ZW||Size (AWG or kcmil)|
|60 Min||30 Min||60 Min||30 Min||60 Min||30 Min|
|AMPACITY CORRECTION FACTORS|
|Ambient Temperature (°C)||For ambient temperatures other than 30°C (86°F), multiply the ampacities shown above by
the appropriate factor shown below.
|Ambient Temperature (°F)|
Note: Other insulations shown in Table 310.104(A) and approved for the temperature and location shall be permitted to be substituted for those shown in Table 610.14(A). The allowable ampacities of conductors used with 15-minute motors shall be the 30-minute ratings increased by 12 percent.
|Time in Seconds||Ampacity of Wire in
Present of Full-Load
|Minimum Size of
|Maximum Distance Between End
Strain Insulators or Clamp-Type
|6||9.0 m (30 ft) or less|
|4||18 m (60 ft) or less|
|2||Over 18 m (60 ft)|
Cranes or Hoists
III Contact Conductors
Such conductors shall be separated at not less than 150 mm (6 in.), other than for monorail hoists where a spacing of not less than 75 mm (3 in.) shall be permitted. Where necessary, intervals between insulating supports shall be permitted to be increased up to 12m (40 ft), the separation between conductors being increased proportionately.
- The conductors supplying the other two phases of the power supply are insulated.
- The power for all phases is obtained from an insulating transformer.
- The voltage does not exceed 300 volts.
- The rail serving as a conductor shall be bonded to the equipment grounding conductor at the transformer and also shall be permitted to be grounded by the fittings used for the suspension or attachment of the rail to a building or structure.
IV Disconnecting Means
- Readily accessible and operable from the ground or floor level
- Lockable open in accordance with 110.25
- Open all ungrounded conductors simultaneously
- Placed within view of the runway contact conductors
Exception: The runway conductor disconnecting means for electrolytic cell lines shall be permitted to be placed out of view of the runway contact conductors where either of the following conditions are met:
- Where a location in view of the contact conductors is impracticable or introduces additional or increased hazards to persons or property
- In industrial installations, with written safety procedures, where conditions of maintenance and supervision ensure that only qualified persons service the equipment
Where a monorail hoist or hand-propelled crane bridge installation meets all of the following, the disconnecting means shall be permitted to be omitted:
- The unit is controlled from the ground or floor level.
- The unit is within view of the power supply disconnecting means.
- No fixed work platform has been provided for servicing the unit.
Where the disconnecting means is not readily accessible from the crane or monorail hoist operating station, means shall be provided at the operating station to open the power circuit to all motors of the crane or monorail hoist.
V Overcurrent Protection
- A single motor shall be considered as protected where the branch-circuit overcurrent device meets the rating requirements of 610.42.
- Overload relay elements in each ungrounded circuit conductor, with all relay elements protected from short circuit by the branch-circuit protection.
- Thermal sensing devices, sensitive to motor temperature or to temperature and current, that are thermally in contact with the motor winding(s). A hoist or trolley shall be considered to be protected if the sensing device is connected in the hoist's upper limit switch circuit so as to prevent further hoisting during an overload condition of either motor.
Moving parts, other than removable accessories, or attachments that have metal-to-metal bearing surfaces, shall be considered to be electrically bonded to each other through bearing surfaces for grounding purposes. The trolley frame and bridge frame shall not be considered as electrically grounded through the bridge and trolley wheels and its respective tracks. A separate bonding conductor shall be provided.
Informational Note No. 1: For further information, see ASME A17.1 -2010/CSA B44-10, Safety Code for Elevators and Escalators.
Informational Note No. 2: For further information, see CSA B44.1-11/ASME-A17.5-2011, Elevator and Escalator Electrical Equipment Certification Standard.
Informational Note No. 3: The term wheelchair lift has been changed to platform lift. For further information, see ASME A18.1-2008, Safety Standard for Platform Lifts and Stairway Lifts.
Informational Note No. 2: Figure 620.2. No. 2 is for information only.
Control Room (for Elevator, Dumbwaiter). An enclosed control space outside the hoistway, intended for full bodily entry, that contains the elevator motor controller. The room could also contain electrical and/or mechanical equipment used directly in connection with the elevator or dumbwaiter but not the electric driving machine or the hydraulic machine.
Control Space (for Elevator, Dumbwaiter). A space inside or outside the hoistway, intended to be accessed with or without full bodily entry, that contains the elevator motorcontroller. This space could also contain electrical and/or mechanical equipment used directly in connection with the elevator or dumbwaiter but not the electrical driving machine or the hydraulic machine.
Control System. The overall system governing the starting, stopping, direction of motion, acceleration, speed, and retardation of the moving member.
Controller, Motor. The operative units of the control system comprised of the starter device(s) and power conversion equipment used to drive an electric motor, or the pumping unit used to power hydraulic control equipment.
Machine Room (for Elevator, Dumbwaiter). An enclosed machinery space outside the hoistway, intended for full bodily entry, that contains the electrical driving machine or the hydraulic machine. The room could also contain electrical and/or mechanical equipment used directly in connection with the elevator or dumbwaiter.
Machinery Space (for Elevator, Dumbwaiter). A space inside or outside the hoistway, intended to be accessed with or without full bodily entry, that contains elevator or dumbwaiter mechanical equipment, and could also contain electrical equipment used directly in connection with the elevator or dumbwaiter. This space could also contain the electrical driving machine or the hydraulic machine.
Remote Machine Room and Control Room (for Elevator, Dumbwaiter). A machine room or control room that is not attached to the outside perimeter or surface of the walls, ceiling, or floor of the hoistway.
Remote Machinery Space and Control Space (for Elevator, Dumbwaiter). A machinery space or control space that is not within the hoistway, machine room, or control room and that is not attached to the outside perimeter or surface of the walls, ceiling, or floor of the hoistway.
Where conditions of maintenance and supervision ensure that only qualified persons examine, adjust, service, and maintain the equipment, the clearance requirements of 110.26(A) shall not be required where any of the conditions in 620.5(A) through (D) are met.
- Controllers and disconnecting means for dumbwaiters, escalators, moving walks, platform lifts, and stairway chairlifts installed in the same space with the driving machine
- Controllers and disconnecting means for elevators installed in the hoistway or on the car
- Controllers for door operators
- Other electrical equipment installed in the hoistway or on the car
Informational Note: One method of determining that conductors are flame retardant is by testing the conductors to the VW-1 (Vertical-Wire) Flame Test in ANSI/UL 15812011, Reference Standard for Electrical Wires, Cables, and Flexible Cords.
Conductors shall be Type MTW, TF, TFF, TFN, TFFN, THHN, THW, THWN, TW, XHHW, hoistway cable, or any other conductor with insulation designated as flame retardant. Shielded conductors shall be permitted if such conductors are insulated for the maximum nominal circuit voltage applied to any conductor within the cable or raceway system.
Informational Note No. 1: The heating of conductors depends on root-mean-square current values, which, with generator field control, are reflected by the nameplate current rating of the motor-generator driving motor rather than by the rating of the elevator motor, which represents actual but short-time and intermittent full-load current values.
Informational Note No. 2: See Informational Note, Figure 620.13, No. 2.
Figure 620.13 Informational Note Single-Line Diagram, No. 2
Informational Note: Some elevator motor currents, or those motor currents of similar function, exceed the motor nameplate value. Heating of the motor and conductors is dependent on the root-mean square (rms) current value and the length of operation time. Because this motor application is inherently intermittent duty, conductors are sized for duty cycle service as shown in Table 430.22(E).
Informational Note No. 1: The nameplate current rating of a power transformer supplying a motor controller reflects the nameplate current rating of the motor controller at line voltage (transformer primary).
Informational Note No. 2: See Informative Annex D, Example No. D 10.
Informational Note: See Informative Annex D, Example Nos. D9 and D10.
|Number of Elevators on a |
|10 or more||0.72|
* Demand factors are based on 50 percent duty cycle (i.e., half time on and half time off).
(a) Cables used in Class 2 power-limited circuits shall be permitted to be installed between risers and signal equipment and operating devices, provided the cables are supported and protected from physical damage and are of a jacketed and flame-retardant type.
(b) Flexible cords and cables that are components of listed equipment and used in circuits operating at 30 volts rms or less or 42 volts dc or less shall be permitted in lengths not to exceed 1.8 m (6 ft), provided the cords and cables are supported and protected from physical damage and are of a jacketed and flame-retardant type.
(c) The following wiring methods shall be permitted in the hoistway in lengths not to exceed 1.8 m (6 ft):
- Flexible metal conduit
- Liquidtight flexible metal conduit
- Liquidtight flexible nonmetallic conduit
- Flexible cords and cables, or conductors grouped together and taped or corded, shall be permitted to be installed without a raceway. They shall be located to be protected from physical damage and shall be of a flame-retardant type and shall be part of the following:
- Listed equipment
- A driving machine, or
- A driving machine brake
Exception to 620.21(A)(1)(c)(1), (2), and (3): The conduit length shall not be required to be limited between risers and limit switches, interlocks, operating buttons, and similar devices.
(d) A sump pump or oil recovery pump located in the pit shall be permitted to be cord connected. The cord shall be a hard usage oil-resistant type, of a length not to exceed 1.8 m (6 ft), and shall be located to be protected from physical damage.
(a) Flexible metal conduit, liquidtight flexible metal conduit, or liquidtight flexible nonmetallic conduit of metric designator 12 (trade size 3/8), or larger, not exceeding 1.8 m (6 ft) in length, shall be permitted on cars where so located as to be free from oil and if securely