8.2 Miscellaneous Special Equipment (0702)

8.2 Miscellaneous Special Equipment

Domain 07 / 0702 (3% of exam): Inspect electric wiring and equipment for miscellaneous special equipment; verify wiring for computer and data equipment; inspect electric signs for correct type, use, and installation. References are to the 2023 NEC.

NEC Chapter 6 Scope — Special Equipment

NEC Chapter 6 covers Special Equipment — installations unusual in their use, environment, or operational complexity. Articles most relevant to the commercial electrical inspector include:

• Article 600 — Electric Signs and Outline Lighting.
• Article 610 — Cranes and Hoists.
• Article 620 — Elevators, Escalators, Moving Walks, and Platform Lifts.
• Article 625 — Electric Vehicle Power Transfer System (EVSE).
• Article 645 — Information Technology Equipment (ITE) Rooms.
• Article 660 — X-Ray Equipment.
• Article 680 — Swimming Pools, Fountains (covered in 8.1).

Article 645 — Information Technology Equipment (ITE) Rooms

Article 645 governs ITE rooms (data centers, computer rooms). The special wiring methods permitted in Article 645 are alternatives to Chapter 3 wiring methods and apply only inside the IT equipment room where ALL conditions of 645.4 are met.

645.4 — Conditions for Use

All of the following conditions must be met to apply Article 645:

1. A disconnecting means complying with 645.10 is provided.
2. An HVAC system independent of other areas, or a fire suppression system listed for IT rooms.
3. IT equipment is listed for IT room use.
4. Cables under raised floors are listed as plenum/riser or installed in raceways.
5. The room is separated from other areas by fire-rated construction per the building code.

If ANY one condition is not met, the alternate Article 645 wiring methods may NOT be used, and Chapter 3 wiring methods apply.

645.5 — Supply Circuits and Interconnecting Cables

645.5 permits alternate wiring methods inside IT rooms, including under raised floors: Type DP (plenum) cables, interconnecting cables, and power cables listed for IT use. Branch circuits to IT equipment may use flexible cords and cables. Under-raised-floor wiring must be listed for the environment and routed to avoid physical damage.

645.10 — Disconnecting Means

A single disconnecting means for all electronic equipment in the IT room must be provided, controlled by group shutdown. It must:

• Be located in a readily accessible location adjacent to and accessible from the principal exit door(s) of the IT room.
• Open all ungrounded supply conductors to the IT equipment.
• Have a remote shutoff located at the principal exit.

Class 2 and Class 3 Circuits Inside the IT Room

Interconnecting cables between listed information technology equipment are permitted to be installed under a raised floor as part of the listed assembly. Where Class 2 and Class 3 circuits are used in the IT room, the 2023 NEC's reorganized Article 725 governs them — and remember that Class 1 circuits moved to the new Article 724 in the 2023 cycle.

Article 600 — Electric Signs and Outline Lighting

Article 600 covers the installation of electric signs, outline lighting, and skeletal neon tubing. Key requirements:

600.3 / 600.4 — Listing and Marking

All signs and outline lighting systems must be listed (600.3) and marked (600.4) with the listing label, input voltage/amperage, manufacturer, and installation instructions. Field-installed skeletal neon tubing must be listed.

600.5 — Branch Circuits

600.5(A) requires each commercial building and each commercial occupancy accessible to pedestrians to be provided with at least one outlet at each entrance for sign or outline lighting use, supplied by a branch circuit rated at least 20 A that supplies no other load. 220.14(F) requires that required sign circuit to be computed at a minimum of 1200 VA. The 2023 NEC added exceptions permitting a time switch or photocontrol directly related to the sign to share that circuit.

600.12 — Disconnecting Means

A disconnecting means must be provided for each sign or outline lighting system. It must:

• Open all ungrounded conductors.
• Be within sight of the sign, OR
• Be lockable in the open (OFF) position.

600.7 / 600.21 — Field-Installed Secondary Wiring (Neon)

For skeleton-tubing (neon) signs and outline lighting, the field-installed secondary conductors between the transformer or power supply and the tubing are GTO cable rated for the output voltage. The length of secondary conductor is limited so that the capacitive losses of a long run do not defeat the system: 20 ft (6 m) where installed in metal conduit or tubing, and 50 ft (15 m) where installed in nonmetallic conduit. The conductors must be installed in a listed raceway or in an enclosure identified for the purpose, and each secondary circuit is limited to 1000 volts or less to ground where the tubing is accessible.

600.24 — GFCI for Signs

All cord-and-plug-connected signs shall be GFCI protected for personnel.

600.32 — Portable and Mobile Signs (Part IV)

Portable and mobile signs shall be cord-and-plug-connected, listed, and GFCI protected. Branch circuit rating shall not exceed 20 A.

Overview: Other Special-Equipment Articles

Article 610 — Cranes and Hoists

Article 610 covers conductors, runway, and hoist wiring for cranes and hoists. A disconnecting means must be provided for the runway conductors and for each crane or hoist, capable of being locked in the open position (610.32).

Article 620 — Elevators, Escalators, Moving Walks

Article 620 governs elevators, dumbwaiters, escalators, moving walks, and platform lifts. Key inspector checkpoints:

• 620.51: a single means for disconnecting all ungrounded main power supply conductors must be provided for each unit, capable of being locked in the open position, and located where it is readily accessible to qualified persons — in the machine room, control room, or at the machinery/control space. It must not disconnect the car lighting, receptacle, ventilation, heating and air conditioning, or the machine room lighting, which are separately supplied and separately disconnected.
• 620.85: all 125-volt, single-phase, 15- and 20-ampere receptacles installed in pits, hoistways, on elevator car tops, and in escalator and moving walk wellways require GFCI protection, and a single receptacle supplying a permanently installed sump pump does not require GFCI. Receptacles in machine rooms, control rooms, and machinery spaces likewise require GFCI, except for a single dedicated receptacle supplying a permanently installed sump pump.
• 620.22 / 620.23: a separate branch circuit must supply the car lights, receptacles, auxiliary lighting, and ventilation, and another separate branch circuit must supply the machine room or machinery space lighting and receptacles; the machine room lighting switch must be at the point of entry.

Article 625 — Electric Vehicle Power Transfer System (EVSE)

Article 625 governs EV charging equipment. Key rules:

• 625.5 / 625.6: all electric vehicle supply equipment and wiring systems must be listed or labeled, and the coupling means must be listed for the purpose.
• 625.17 / 625.18: cords and cables for EVSE are limited in length and must be a listed type; the interlock requirements prevent the vehicle from being energized while the connector is not properly engaged.
• 625.42: the EV supply equipment is a continuous load, so the branch circuit is sized at 125% of the equipment rating — the reason a 40 A EVSE lands on a 50 A circuit.
• 625.43: a disconnecting means is required for EVSE rated more than 60 amperes or more than 150 volts to ground, located within sight of the equipment or lockable in the open position.
• 625.54: all receptacles installed for the connection of electric vehicle charging that are rated 125 V through 250 V, 50 A or less, require GFCI protection for personnel.

Special-Equipment Articles Quick Reference