10.1 Luminaires and Lighting (NEC Article 410)

Why This Matters for the TX Journeyman Exam

Article 410 — Luminaires, Lampholders, and Lamps falls under content outline area 6 (Equipment & Devices). Most 410 questions appear in the NEC Knowledge part of the exam and test your recall of clearance distances, support rules, and the commercial luminaire disconnect requirement. A smaller number show up in Calculations when a branch circuit must be sized for a lighting load, but the calculation mechanics belong to Ch6.

Listing Required (NEC 410.6)

Every luminaire, lampholder, and retrofit kit must be listed (NEC 410.6). Field-fabricated luminaires are not permitted unless listed and labeled. The listing confirms suitability for the location — damp, wet, or hazardous — and validates the markings on the luminaire. A luminaire installed in a location for which it is not listed is a code violation even when it appears to function.

Damp and Wet Locations (NEC 410.10(A))

NEC 410.10(A) requires a luminaire installed in a damp or wet location to be identified for that location. A damp location is subject to moderate levels of moisture (covered porches, under canopies); a wet location is subject to saturation (direct rain, shower stalls, below grade). Luminaires marked "Suitable for Damp Locations" may not be installed in wet locations. Recessed luminaires in wet locations must use a gasket or seal listed for the application.

Luminaires Near Combustible Material (NEC 410.10)

NEC 410.10 requires luminaires to be constructed, installed, or equipped with shades or guards so combustible material is not subjected to temperatures above 90°C (194°F). Recessed luminaires must be spaced from insulation per their listing (Type IC vs non-IC). A luminaire mounted close to stored combustibles must be listed for that use.

Clothes Closets — Clearance Table (NEC 410.16(D))

NEC 410.16 governs luminaires in clothes closets. Section 410.16(A) defines the storage space (the space defined by the closet walls and the vertical planes at the shelf edge and closet rod). The clearance requirements appear in NEC 410.16(D) and are measured from the nearest point of the luminaire to the storage plane. Four luminaire types carry specific minimum clearances:

Pendant luminaires and lampholders are not permitted in clothes closets. Closet rods must not extend past the luminaire's clearance zone.

Exception to 410.16(D): surface-mounted fluorescent or LED luminaires that are identified for clothes-closet use may be installed within the storage space, provided they are listed and installed per their marking.

Luminaires in Bathtub and Shower Areas (NEC 410.10(D))

NEC 410.10(D) governs luminaires near bathtubs and showers. Two subrules apply:

• 410.10(D)(1) — Restricted zone: a zone measuring 3 ft horizontally and 8 ft vertically from the top of the bathtub rim or shower threshold is established. Within this zone, cord-connected luminaires, pendants, chain- or cable-suspended luminaires, lighting track, and ceiling-suspended (paddle) fans with light kits are prohibited.
• 410.10(D)(2) — Location marking: luminaires located within the actual dimensions of the tub or shower up to 8 ft above the rim or threshold must be marked suitable for damp locations, or suitable for wet locations where subject to shower spray.

Article 410 does not impose a blanket GFCI-protection requirement on shower luminaires. GFCI protection for shower-area receptacles comes from NEC 210.8 (covered in Ch6), and any GFCI requirement on the luminaire itself would come from the manufacturer's instructions enforced via NEC 110.3(B), not from 410.10(D).

Luminaire Support (NEC 410.36)

A luminaire weighing 50 lb or less may be supported by the outlet box alone, provided the box is listed for the load. Heavier luminaires require independent support from the building structure or a listed fixture stud. Cord-and-plug-connected luminaires must be supported independently of the attachment plug.

Luminaire Whips and Taps (NEC 410.117(C), 410.48)

NEC 410.117(C) permits a 6 ft maximum flexible whip (flexible metal or nonmetallic conduit, or listed fixture wire in a suitable raceway or Type AC/MC cable) between a junction box and a recessed luminaire. The fixture wire must be at least 18 AWG on 15 A and 20 A branch circuits per NEC 240.5(B)(2).

NEC 410.48 allows a luminaire tap from a 20 A branch circuit: the tap conductor must run in a suitable raceway or Type AC/MC cable, be sized for the luminaire load, and terminate on the luminaire side of the ballast/driver. The tap length range is 18 in. minimum to 6 ft maximum — the 18 in. minimum prevents the tap from being too short to safely route, and the 6 ft maximum bounds the unprotected run.

Commercial Luminaire Disconnect (NEC 410.130(C))

In commercial installations, NEC 410.130(C) requires each luminaire to have an individual disconnecting means that simultaneously opens all ungrounded conductors supplying that luminaire. Acceptable means include:

• A cord-and-plug connection to a receptacle supplied by the luminaire circuit
• A listed luminaire disconnect installed on the luminaire side of the ballast/driver
• A wall switch or circuit breaker if it is within sight of the luminaire (within 50 ft) and dedicated to that luminaire

A high-bay luminaire with a cord-and-plug connection satisfies the rule through its receptacle. The disconnect must be accessible to maintenance personnel and is not required to be at the luminaire itself. Industrial installations may use a single disconnect for a group of luminaires where documented maintenance procedures ensure the circuit is de-energized before any luminaire is serviced.

Residential installations have no equivalent individual-disconnect rule. The exam frequently tests whether a residential garage luminaire needs an individual disconnect — it does not.

Track Lighting (NEC 410.140–410.154)

Track lighting (NEC 410.140) must be listed and labeled, and each track section must be supported independently. The track load must not exceed the track's listed ampere rating. Track lighting in residential clothes closets, damp/wet locations, and concealed spaces is restricted per 410.152.