ADOPTS WITH AMENDMENTS:

NFPA 70, 2017

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

ARTICLE 600ELECTRIC SIGNS AND OUTLINE LIGHTING

Adopting Agency BSC BSC-CG SFM HCD DSA OSHPD DPH
1 2 AC SS SS/CC 1 1R 2 3 4 5  
Adopt Entire Article X   X X X   X X X X X X X X  
Adopt entire Article as amended (amended sections listed below)                              
Adopt only those sections that are listed below                              
Article/Section
                               

ARTICLE 604 — MANUFACTURED WIRING SYSTEMS

Adopting Agency BSC BSC-CG SFM HCD DSA OSHPD DPH
1 2 AC SS SS/CC 1 1R 2 3 4 5  
Adopt Entire Article X   X       X X X X X X X X  
Adopt entire Article as amended (amended sections listed below)                              
Adopt only those sections that are listed below                              
Article/Section
                               

ARTICLE 605 — OFFICE FURNISHINGS

Adopting Agency BSC BSC-CG SFM HCD DSA OSHPD DPH
1 2 AC SS SS/CC 1 1R 2 3 4 5  
Adopt Entire Article X   X       X X X X X X X X  
Adopt entire Article as amended (amended sections listed below)                              
Adopt only those sections that are listed below                              
Article/Section
                               

ARTICLE 610 — CRANES AND HOISTS

Adopting Agency BSC BSC-CG SFM HCD DSA OSHPD DPH
1 2 AC SS SS/CC 1 1R 2 3 4 5  
Adopt Entire Article X   X       X X X X X X X X  
Adopt entire Article as amended (amended sections listed below)                              
Adopt only those sections that are listed below                              
Article/Section
                               

ARTICLE 620 — ELEVATORS, DUMBWAITERS, ESCALATORS, MOVING WALKS, PLATFORM LIFTS AND STAIRWAY CHAIRLIFTS

Adopting Agency BSC BSC-CG SFM HCD DSA OSHPD DPH
1 2 AC SS SS/CC 1 1R 2 3 4 5  
Adopt Entire Article X     X X         X X X X X  
Adopt entire Article as amended (amended sections listed below)     X       X X X            
Adopt only those sections that are listed below                              
Article/Section
620.21(A)(5)                 X            
620.71     X       X X              

ARTICLE 625ELECTRIC VEHICLE CHARGING SYSTEM

Adopting Agency BSC BSC-CG SFM HCD DSA OSHPD DPH
1 2 AC SS SS/CC 1 1R 2 3 4 5  
Adopt Entire Article X           X X X X X X X X  
Adopt entire Article as amended (amended sections listed below)     X1 X1 X1                    
Adopt only those sections that are listed below   X                          
Article/Section
625.1.1   X X X X                    
625.52(B)                            
625.52(C)     X                    
1. This state agency adopts the entire article as amended except for those sections indicated by the following symbol: †
The ♦ designation indicates that the State Fire Marshal's adoption of this chapter or individual sections is applicable to structures subject to HCD 1 and/or 2.

ARTICLE 626ELECTRIFIED TRUCK PARKING SPACES

Adopting Agency BSC BSC-CG SFM HCD DSA OSHPD DPH
1 2 AC SS SS/CC 1 1R 2 3 4 5  
Adopt Entire Article X   X X X   X X              
Adopt entire Article as amended (amended sections listed below)                              
Adopt only those sections that are listed below                              
Article/Section
                               

ARTICLE 630 — ELECTRIC WELDERS

Adopting Agency BSC BSC-CG SFM HCD DSA OSHPD DPH
1 2 AC SS SS/CC 1 1R 2 3 4 5  
Adopt Entire Article X   X       X X X X X X X X  
Adopt entire Article as amended (amended sections listed below)                              
Adopt only those sections that are listed below                              
Article/Section
                               

ARTICLE 640 — AUDIO SIGNAL PROCESSING, AMPLIFICATION, AND REPRODUCTION EQUIPMENT

Adopting Agency BSC BSC-CG SFM HCD DSA OSHPD DPH
1 2 AC SS SS/CC 1 1R 2 3 4 5  
Adopt Entire Article X           X X X X X X X X  
Adopt entire Article as amended (amended sections listed below)     X                        
Adopt only those sections that are listed below                              
Article/Section
640.3(J)     X                        
640.9(B)     X                        
640.9(C)     X                        

ARTICLE 645INFORMATION TECHNOLOGY EQUIPMENT

Adopting Agency BSC BSC-CG SFM HCD DSA OSHPD DPH
1 2 AC SS SS/CC 1 1R 2 3 4 5  
Adopt Entire Article X   X       X X X X X X X X  
Adopt entire Article as amended (amended sections listed below)                              
Adopt only those sections that are listed below                              
Article/Section
                               

ARTICLE 646MODULAR DATA CENTERS

Adopting Agency BSC BSC-CG SFM HCD DSA OSHPD DPH
1 2 AC SS SS/CC 1 1R 2 3 4 5  
Adopt Entire Article X   X X X   X X X X X X X X  
Adopt entire Article as amended (amended sections listed below)                              
Adopt only those sections that are listed below                              
Article/Section
                               

ARTICLE 647 — SENSITIVE ELECTRONIC EQUIPMENT

Adopting Agency BSC BSC-CG SFM HCD DSA OSHPD DPH
1 2 AC SS SS/CC 1 1R 2 3 4 5  
Adopt Entire Article X   X       X X X X X X X X  
Adopt entire Article as amended (amended sections listed below)                              
Adopt only those sections that are listed below                              
Article/Section
                               

ARTICLE 650PIPE ORGANS

Adopting Agency BSC BSC-CG SFM HCD DSA OSHPD DPH
1 2 AC SS SS/CC 1 1R 2 3 4 5  
Adopt Entire Article X   X       X X X X X X X X  
Adopt entire Article as amended (amended sections listed below)                              
Adopt only those sections that are listed below                              
Article/Section
                               

ARTICLE 660 — X-RAY EQUIPMENT

Adopting Agency BSC BSC-CG SFM HCD DSA OSHPD DPH
1 2 AC SS SS/CC 1 1R 2 3 4 5  
Adopt Entire Article X   X       X X X X X X X X  
Adopt entire Article as amended (amended sections listed below)                              
Adopt only those sections that are listed below                              
Article/Section
                               

ARTICLE 665 — INDUCTION AND DIELECTRIC HEATING EQUIPMENT

Adopting Agency BSC BSC-CG SFM HCD DSA OSHPD DPH
1 2 AC SS SS/CC 1 1R 2 3 4 5  
Adopt Entire Article X   X       X X X X X X X X  
Adopt entire Article as amended (amended sections listed below)                              
Adopt only those sections that are listed below                              
Article/Section
                               

ARTICLE 668ELECTROLYTIC CELLS

Adopting Agency BSC BSC-CG SFM HCD DSA OSHPD DPH
1 2 AC SS SS/CC 1 1R 2 3 4 5  
Adopt Entire Article X   X       X X X X X X X X  
Adopt entire Article as amended (amended sections listed below)                              
Adopt only those sections that are listed below                              
Article/Section
                               

ARTICLE 669 — ELECTROPLATING

Adopting Agency BSC BSC-CG SFM HCD DSA OSHPD DPH
1 2 AC SS SS/CC 1 1R 2 3 4 5  
Adopt Entire Article X   X       X X X X X X X X  
Adopt entire Article as amended (amended sections listed below)                              
Adopt only those sections that are listed below                              
Article/Section
                               

ARTICLE 670 — INDUSTRIAL MACHINERY

Adopting Agency BSC BSC-CG SFM HCD DSA OSHPD DPH
1 2 AC SS SS/CC 1 1R 2 3 4 5  
Adopt Entire Article X   X       X X X X X X X X  
Adopt entire Article as amended (amended sections listed below)                              
Adopt only those sections that are listed below                              
Article/Section
                               

ARTICLE 675 — ELECTRICALLY DRIVEN OR CONTROLLED IRRIGATION MACHINES

Adopting Agency BSC BSC-CG SFM HCD DSA OSHPD DPH
1 2 AC SS SS/CC 1 1R 2 3 4 5  
Adopt Entire Article X   X       X X X X X X X X  
Adopt entire Article as amended (amended sections listed below)                              
Adopt only those sections that are listed below                              
Article/Section
                               

ARTICLE 680 — SWIMMING POOLS, FOUNTAINS, AND SIMILAR INSTALLATIONS

Adopting Agency BSC BSC-CG SFM HCD DSA OSHPD DPH
1 2 AC SS SS/CC 1 1R 2 3 4 5  
Adopt Entire Article X   X X X   X X X X X X X X  
Adopt entire Article as amended (amended sections listed below)                              
Adopt only those sections that are listed below                             X
Article/Section
680.13                             X
680.14                             X

ARTICLE 682 — NATURALLY AND ARTIFICIALLY MADE BODIES OF WATER

Adopting Agency BSC BSC-CG SFM HCD DSA OSHPD DPH
1 2 AC SS SS/CC 1 1R 2 3 4 5  
Adopt Entire Article X   X X X   X X X X X X X X  
Adopt entire Article as amended (amended sections listed below)                              
Adopt only those sections that are listed below                              
Article/Section
                               

ARTICLE 685 — INTEGRATED ELECTRICAL SYSTEMS

Adopting Agency BSC BSC-CG SFM HCD DSA OSHPD DPH
1 2 AC SS SS/CC 1 1R 2 3 4 5  
Adopt Entire Article X   X       X X X X X X X X  
Adopt entire Article as amended (amended sections listed below)                              
Adopt only those sections that are listed below                              
Article/Section
                               

ARTICLE 690 — SOLAR PHOTOVOLTAIC SYSTEMS

Adopting Agency BSC BSC-CG SFM HCD DSA OSHPD DPH
1 2 AC SS SS/CC 1 1R 2 3 4 5  
Adopt Entire Article X   X X X   X X X X X X X X  
Adopt entire Article as amended (amended sections listed below)                              
Adopt only those sections that are listed below                              
Article/Section
                               

ARTICLE 691 — LARGE-SCALE PHOTOVOLTAIC (PV) ELECTRIC POWER PRODUCTION FACILITY II

Adopting Agency BSC BSC-CG SFM HCD DSA OSHPD DPH
1 2 AC SS SS/CC 1 1R 2 3 4 5  
Adopt Entire Article X     X X   X X X X X X X X  
Adopt entire Article as amended (amended sections listed below)                              
Adopt only those sections that are listed below                              
Article/Section
                               

ARTICLE 692FUEL CELL SYSTEMS

Adopting Agency BSC BSC-CG SFM HCD DSA OSHPD DPH
1 2 AC SS SS/CC 1 1R 2 3 4 5  
Adopt Entire Article X   X X X   X X X X X X X X  
Adopt entire Article as amended (amended sections listed below)                              
Adopt only those sections that are listed below                              
Article/Section
                               

ARTICLE 694 — WIND ELECTRIC SYSTEMS

Adopting Agency BSC BSC-CG SFM HCD DSA OSHPD DPH
1 2 AC SS SS/CC 1 1R 2 3 4 5  
Adopt Entire Article X   X X X   X X X X X X X X  
Adopt entire Article as amended (amended sections listed below)                              
Adopt only those sections that are listed below                              
Article/Section
                               

ARTICLE 695 — FIRE PUMPS

Adopting Agency BSC BSC-CG SFM HCD DSA OSHPD DPH
1 2 AC SS SS/CC 1 1R 2 3 4 5  
Adopt Entire Article X   X       X X              
Adopt entire Article as amended (amended sections listed below)                 X X X X X X  
Adopt only those sections that are listed below                              
Article/Section
695.3                 X X X X X X  
695.3(G)                 X X X X X X  

Part I General

This article covers the installation of conductors, equipment, and field wiring for electric signs, retrofit kits, and outline lighting, regardless of voltage. All installations and equipment using neon tubing, such as signs, decorative elements, skeleton tubing, or art forms, are covered by this article.

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 incandescent 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.

Photovoltaic (PV) Powered Sign. A complete sign powered by solar energy consisting of all components and subassemblies for installation either as an off-grid stand-alone, on-grid interactive, or non-grid interactive system.

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.

Sign Body. A portion of a sign that may provide protection from the weather but is not an electrical enclosure.

Skeleton Tubing. Neon tubing that is itself the sign or outline lighting and is not attached to an enclosure or sign body.

Fixed, mobile, or portable electric signs, section signs, outline lighting, photovoltaic (PV) powered signs, and retrofit kits, regardless of voltage, shall be listed, provided with installation instructions, and installed in conformance with that listing, unless otherwise approved by special permission.
Field-installed skeleton tubing shall not be required to be listed where installed in conformance with this Code.
Outline lighting shall not be required to be listed as a system when it consists of listed luminaires wired in accordance with Chapter 3.
Signs and outline lighting systems shall be listed; marked with the manufacturer's name, trademark, or other means of identification; and input voltage and current rating.
  1. The retrofitted sign shall be marked that the illumination system has been replaced.
  2. The marking shall include the kit providers and installer's name, logo, or unique identifier.
  3. Signs equipped with tubular light-emitting diode lamps powered by the existing sign sockets shall include a label alerting the service personnel that the sign has been modified. The label shall meet the requirements of 110.21(B). The label shall also include a warning not to install fluorescent lamps and shall also be visible during relamping.
Signs and outline lighting systems with lampholders for incandescent lamps shall be marked to indicate the maximum allowable lamp wattage per lampholder. The markings shall be permanently installed, in letters at least 6 mm (1/4 in.) high, and shall be located where visible during relamping.
The markings required in 600.4(A) and listing labels shall not be required to be visible after installation but shall be permanently applied in a location visible during servicing.
Marking labels shall be permanent, durable and, when in wet locations, shall be weatherproof.
All signs, outline lighting, skeleton tubing systems, and retrofit kits shall be marked to indicate that field wiring and installation instructions are required.

Exception: Portable, cord-connected signs are not required to be marked.

Each commercial building and each commercial occupancy accessible to pedestrians shall be provided with at least one outlet in an accessible location at each entrance to each tenant space for sign or outline lighting system use. The outlet(s) shall be supplied by a branch circuit rated at least 20 amperes that supplies no other load. Service hallways or corridors shall not be considered accessible to pedestrians.
Branch circuits that supply signs shall be rated in accordance with 600.5(B)(1) or (B)(2) and shall be considered to be continuous loads for the purposes of calculations.
Branch circuits that supply neon tubing installations shall not be rated in excess of 30 amperes.
Branch circuits that supply all other signs and outline lighting systems shall be rated not to exceed 20 amperes.
Wiring methods used to supply signs shall comply with 600.5(C)(1), (C)(2), and (C)(3).
The wiring method used to supply signs and outline lighting systems shall terminate within a sign, an outline lighting system enclosure, a suitable box, or a conduit body.
Signs and transformer enclosures shall be permitted to be used as pull or junction boxes for conductors supplying other adjacent signs, outline lighting systems, or floodlights that are part of a sign and shall be permitted to contain both branch and secondary circuit conductors.
Metal or nonmetallic poles used to support signs shall be permitted to enclose supply conductors, provided the poles and conductors are installed in accordance with 410.30(B).
Each sign and outline lighting system, feeder conductor(s), or branch circuit(s) supplying a sign, outline lighting system, or skeleton tubing shall be controlled by an externally operable switch or circuit breaker that opens all ungrounded conductors and controls no other load. The switch or circuit breaker shall open all ungrounded conductors simultaneously on multi-wire branch circuits in accordance with 210.4(B). Signs and outline lighting systems located within fountains shall have the disconnect located in accordance with 680.13.

Exception No. 1: A disconnecting means shall not be required for an exit directional sign located within a building.

Exception No. 2: A disconnecting means shall not be required for cord-connected signs with an attachment plug.

Informational Note: The location of the disconnect is intended to allow service or maintenance personnel complete and local control of the disconnecting means.

The disconnecting means shall be permitted to be located in accordance with 600.6(A)(1), (A)(2), and (A)(3):
The disconnect shall be located at the point the feeder circuit or branch circuit(s) supplying a sign or outline lighting system enters a sign enclosure, a sign body, or a pole in accordance with 600.5(C)(3). The disconnect shall open all ungrounded conductors where it enters the enclosure of the sign or pole.

Exception No. 1: A disconnect shall not be required for branch circuit(s) or feeder conductor(s) passing through the sign where enclosed in a Chapter 3 listed raceway or metal-jacketed cable identified for the location.

Exception No. 2: A disconnect shall not be required at the point of entry to a sign enclosure or sign body for branch circuit(s) or feeder conductor(s) that supply an internal panelboard(s) in a sign enclosure or sign body. The conductors shall be enclosed in a Chapter 3 listed raceway or metal-jacketed cable identified for the location. A field-applied permanent warning label that is visible during servicing shall be applied to the raceway at or near the point of entry into the sign enclosure or sign body. The warning label shall comply with 110.21(B) and state the following: "Danger. This raceway contains energized conductors." The marking shall include the location of the disconnecting means for the energized conductor(s). The disconnecting means shall be capable of being locked in the open position in accordance with 110.25.

The disconnecting means shall be within sight of the sign or outline lighting system that it controls. Where the disconnecting means is out of the line of sight from any section that is able to be energized, the disconnecting means shall be lockable in accordance with 110.25. A permanent field-applied marking identifying the location of the disconnecting means shall be applied to the sign in a location visible during servicing. The warning label shall comply with 110.21(B).
The following shall apply for signs or outline lighting systems operated by electronic or electromechanical controllers located external to the sign or outline lighting system:
  1. The disconnecting means shall be located within sight of the controller or in the same enclosure with the controller.
  2. The disconnecting means shall disconnect the sign or outline lighting system and the controller from all ungrounded supply conductors.
  3. The disconnecting means shall be designed such that no pole can be operated independently and shall be lockable in accordance with 110.25.

Exception: Where the disconnecting means is not located within sight of the controller, a permanent field-applied marking identifying the location of the disconnecting means shall be applied to the controller in a location visible during servicing. The warning label shall comply with 110.21(B).

Switches, flashers, and similar devices controlling transformers and electronic power supplies shall be rated for controlling inductive loads or have a current rating not less than twice the current rating of the transformer or the electronic power supply.
Metal equipment of signs, outline lighting, and skeleton tubing systems shall be grounded by connection to the equipment grounding conductor of the supply branch circuit(s) or feeder using the types of equipment grounding conductors specified in 250.118.

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 equipment grounding conductor size shall be in accordance with 250.122 based on the rating of the overcurrent device protecting the branch circuit or feeder conductors supplying the sign or equipment.
Equipment grounding conductor connections shall be made in accordance with 250.130 and in a method specified in 250.8.
Auxiliary grounding electrode(s) shall be permitted for electric signs and outline lighting systems covered by this article and shall meet the requirements of 250.54.
Metal parts of a building shall not be permitted as a secondary return conductor or an equipment grounding conductor.
Metal parts and equipment of signs and outline lighting systems shall be bonded together and to the associated transformer or power-supply equipment grounding conductor of the branch circuit or feeder supplying the sign or outline lighting system and shall meet the requirements of 250.90.

Exception: Remote metal parts of a section sign or outline lighting system only supplied by a remote Class 2 power supply shall not be required to be bonded to an equipment grounding conductor.

Bonding connections shall be made in accordance with 250.8.
Metal parts of a building shall not be permitted to be used as a means for bonding metal parts and equipment of signs or outline lighting systems together or to the transformer or power-supply equipment grounding conductor of the supply circuit.
Listed flexible metal conduit or listed liquidtight flexible metal conduit that encloses the secondary circuit conductor from a transformer or power supply for use with neon tubing shall be permitted as a bonding means if the total accumulative length of the conduit in the secondary circuit does not exceed 30 m (100 ft).
Small metal parts not exceeding 50 mm (2 in.) in any dimension, not likely to be energized, and spaced at least 19 mm (3/4 in.) from neon tubing shall not require bonding.
Where listed nonmetallic conduit is used to enclose the secondary circuit conductor from a transformer or power supply and a bonding conductor is required, the bonding conductor shall be installed separate and remote from the nonmetallic conduit and be spaced at least 38 mm (11/2 in.) from the conduit when the circuit is operated at 100 Hz or less or 45 mm (13/4 in.) when the circuit is operated at over 100 Hz.
Bonding conductors shall comply with (1) and (2).
  1. Bonding conductors shall be copper and not smaller than 14 AWG.
  2. Bonding conductors installed externally of a sign or raceway shall be protected from physical damage.
Signs or outline lighting installed inside a fountain shall have all metal parts bonded to the equipment grounding conductor of the branch circuit for the fountain recirculating system. The bonding connection shall be as near as practicable to the fountain and shall be permitted to be made to metal piping systems that are bonded in accordance with 680.53.

Informational Note: Refer to 600.32(J) for restrictions on length of high-voltage secondary conductors.

Live parts, other than lamps, and neon tubing shall be enclosed. Transformers and power supplies provided with an integral enclosure, including a primary and secondary circuit splice enclosure, shall not require an additional enclosure.
Enclosures shall have ample structural strength and rigidity.
Sign and outline lighting system enclosures shall be constructed of metal or shall be listed.
Sheet copper or aluminum shall be at least 0.51 mm (0.020 in.) thick. Sheet steel shall be at least 0.41 mm (0.016 in.) thick.
Metal parts of equipment shall be protected from corrosion.
Sign or outline lighting system equipment shall be at least 4.3 m (14 ft) above areas accessible to vehicles unless protected from physical damage.
Neon tubing, other than listed, dry-location, portable signs, readily accessible to pedestrians shall be protected from physical damage.

Informational Note: See 600.41(D) for additional requirements.

Signs and outline lighting systems shall be installed so that adjacent combustible materials are not subjected to temperatures in excess of 90°C (194°F).

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.).

Signs and outline lighting system equipment for wet location use, other than listed watertight type, shall be weatherproof and have drain holes, as necessary, in accordance with the following:
  1. Drain holes shall not be larger than 13 mm (1/2 in.) or smaller than 6 mm (1/4 in.).
  2. Every low point or isolated section of the equipment shall have at least one drain hole.
  3. Drain holes shall be positioned such that there will be no external obstructions.
Portable or mobile signs shall be adequately supported and readily movable without the use of tools.
An attachment plug shall be provided for each portable or mobile sign.
Portable or mobile signs in wet or damp locations shall comply with 600.10(C)(1) and (C)(2).
All cords shall be junior hard-service or hard-service types as designated in Table 400.4 and have an equipment grounding conductor.
The manufacturer of portable or mobile signs shall provide listed ground-fault circuit-interrupter protection for personnel. The ground-fault circuit interrupter shall be an integral part of the attachment plug or shall be located in the power-supply cord within 300 mm (12 in.) of the attachment plug.
Portable or mobile signs in dry locations shall meet the following:
  1. Cords shall be SP-2, SPE-2, SPT-2, or heavier, as designated in Table 400.4.
  2. The cord shall not exceed 4.5 m (15 ft) in length.
Field-installed secondary circuit wiring for electric signs, retrofit kits, outline lighting systems, skeleton tubing, and photovoltaic (PV) powered sign systems shall be in accordance with their installation instructions and 600.12(A), (B), or (C).
Neon and secondary circuit wiring of 1000 volts or less shall comply with 600.31.
Neon secondary circuit wiring of over 1000 volts shall comply with 600.32.
Where the installation complies with 600.33 and the power source provides a Class 2 output that complies with 600.24, either of the following wiring methods shall be permitted as determined by the installation instructions and conditions.
  1. Wiring methods identified in Chapter 3
  2. Class 2 cables complying with Table 600.33(A)(1) and Table 600.33(A)(2)
Ballasts, transformers, electronic power supplies, and Class 2 power sources shall be of the self-contained type or be enclosed by placement in a listed sign body or listed separate enclosure.
Ballasts, transformers, electronic power supplies, and Class 2 power sources shall be located where accessible and shall be securely fastened in place.
Ballasts, transformers, electronic power supplies, and Class 2 power sources shall be installed as near to the lamps or neon tubing as practicable to keep the secondary conductors as short as possible.
Ballasts, transformers, electronic power supplies, and Class 2 power sources used in wet locations shall be of the weatherproof type or be of the outdoor type and protected from the weather by placement in a sign body or separate enclosure.
A working space at least 900 mm (3 ft) high × 900 mm (3 ft) wide × 900 mm (3 ft) deep shall be provided at each ballast, transformer, electronic power supply, and Class 2 power source or at its enclosure where not installed in a sign.
Ballasts, transformers, electronic power supplies, and Class 2 power sources shall be permitted to be located in attics and soffits, provided there is an access door at least 900 mm × 562.5 mm (36 in. × 221/2 in.) and a passageway of at least 900 mm (3 ft) high × 600 mm (2 ft) wide with a suitable permanent walkway at least 300 mm (12 in.) wide extending from the point of entry to each component. At least one lighting outlet containing a switch or controlled by a wall switch shall be installed in such spaces. At least one point of control shall be at the usual point of entry to these spaces. The lighting outlet shall be provided at or near the equipment requiring servicing.
Ballasts, transformers, electronic power supplies, and Class 2 power sources shall be permitted to be located above suspended ceilings, provided that their enclosures are securely fastened in place and not dependent on the suspended-ceiling grid for support. Ballasts, transformers, and electronic power supplies installed in suspended ceilings shall not be connected to the branch circuit by flexible cord.
Ballasts shall be identified for the use and shall be listed.
Transformers and electronic power supplies shall be identified for the use and shall be listed.
Transformers and electronic power supplies other than the following shall have secondary-circuit ground-fault protection:
  1. Transformers with isolated ungrounded secondaries and with a maximum open circuit voltage of 7500 volts or less
  2. Transformers with integral porcelain or glass secondary housing for the neon tubing and requiring no field wiring of the secondary circuit
Secondary-circuit voltage shall not exceed 15,000 volts, nominal, under any load condition. The voltage to ground of any output terminals of the secondary circuit shall not exceed 7500 volts, under any load condition.
Transformers and electronic power supplies shall have a secondary-circuit current rating of not more than 300 mA.
Secondary circuit outputs shall not be connected in parallel or in series.
Transformers and electronic power supplies that are equipped with secondary-circuit ground-fault protection shall be so marked.
Class 2 transformers, power supplies, and power sources shall comply with the requirements of Class 2 circuits and 600.24(A), (B), (C), and (D).
Class 2 power supplies and power sources shall be listed for use with electric signs and outline lighting systems or shall be a component in a listed electric sign.
Metal parts of Class 2 power supplies and power sources shall be grounded by connecting to the equipment grounding conductor.
Conductors and equipment on the supply side of the power source shall be installed in accordance with the appropriate requirements of Chapter 3.
Secondary wiring on the load side of a Class 2 power source shall comply with 600.12(C) and 600.33.

Part II Field-Installed Skeleton Tubing, Outline Lighting, and Secondary Wiring

Part II of this article shall apply to all of the following:
  1. Field-installed skeleton tubing
  2. Field-installed secondary circuits
  3. Outline lighting

These requirements shall be in addition to the requirements of Part I.

Conductors shall be installed using any wiring method included in Chapter 3 suitable for the conditions.
Conductors shall be listed, insulated, and not smaller than 18 AWG.
The number of conductors in a raceway shall be in accordance with Table 1 of Chapter 9.
Conductors shall be installed so they are not subject to physical damage.
Bushings shall be used to protect wires passing through an opening in metal.
Conductors shall be installed in rigid metal conduit, intermediate metal conduit, liquidtight flexible nonmetallic conduit, flexible metal conduit, liquidtight flexible metal conduit, electrical metallic tubing, metal enclosures; on insulators in metal raceways; or in other equipment listed for use with neon secondary circuits over 1000 volts.
Conduit or tubing shall contain only one conductor.
Conduit or tubing shall be a minimum of metric designator 16 (trade size 1/2).
Other than at the location of connection to a metal enclosure or sign body, nonmetallic conduit or flexible nonmetallic conduit shall be spaced no less than 38 mm (11/2 in.) from grounded or bonded parts when the conduit contains a conductor operating at 100 Hz or less, and shall be spaced no less than 45 mm (13/4 in.) from grounded or bonded parts when the conduit contains a conductor operating at more than 100 Hz.
Metal parts of a building shall not be permitted as a secondary return conductor or an equipment grounding conductor.
Conductors shall be insulated, listed as gas tube sign and ignition cable type GTO, rated for 5, 10, or 15 kV, not smaller than 18 AWG, and have a minimum temperature rating of 105°C (221°F).
Conductors shall be so installed that they are not subject to physical damage.
Sharp bends in insulated conductors shall be avoided.
Secondary conductors shall be separated from each other and from all objects other than insulators or neon tubing by a spacing of not less than 38 mm (11/2 in.). GTO cable installed in metal conduit or tubing shall not require spacing between the cable insulation and the conduit or tubing.
Insulators and bushings for conductors shall be listed for use with neon secondary circuits over 1000 volts.
The insulation on all conductors shall extend not less than 65 mm (21/2 in.) beyond the metal conduit or tubing.
Conductors shall be permitted to run between the ends of neon tubing or to the secondary circuit midpoint return of listed transformers or listed electronic power supplies and provided with terminals or leads at the midpoint.
Equipment having an open circuit voltage exceeding 1000 volts shall not be installed in or on dwelling occupancies.
The length of secondary circuit conductors from a high-voltage terminal or lead of a transformer or electronic power supply to the first neon tube electrode shall not exceed the following:
  1. 6 m (20 ft) where installed in metal conduit or tubing
  2. 15 m (50 ft) where installed in nonmetallic conduit
All other sections of secondary circuit conductor in a neon tube circuit shall be as short as practicable.
Splices in high-voltage secondary circuit conductors shall be made in listed enclosures rated over 1000 volts. Splice enclosures shall be accessible after installation and listed for the location where they are installed.
The wiring methods and materials used shall be in accordance with the sign manufacturer's installation instructions using any applicable wiring methods from Chapter 3, Wiring Methods, and the requirements for Class 2 circuits contained in 600.12(C), 600.24, and 600.33(A), (B), (C), and (D).
Class 2 cable listed for the application that complies with Table 600.33(A)(1) or Table 600.33(A)(2) for substitutions shall be installed on the load side of the Class 2 power source. The conductors shall have an ampacity not less than the load to be supplied and shall not be sized smaller than 18 AWG.
CL2 or CL3, PLTC, or any listed applicable cable for general use shall be installed within and on buildings or structures.

TABLE 600.33(A)(1) Applications of Power Limited Cable in Signs and Outline Lighting

Location CL2 CL3 CL2R CL3R CL2P CL3P PLTC
Non-concealed spaces inside buildings Y Y Y Y Y Y Y
Concealed spaces inside buildings that are not used as plenums or risers Y Y Y Y Y Y Y
Environmental air spaces plenums- or risers N N N N Y Y N
Wet locations N N N N N N Y
Y = Permitted. N = Not Permitted.