Electrical Code Rules for Lighting Installations
Published on November 12, 2026 by Staff Writer
The National Electrical Code (NEC), published as NFPA 70, sets safety requirements for electrical installations. This JADE Learning guide covers the 2023 NEC rules for lighting in homes and commercial buildings.
The electrical regulations covered here address load calculations, outlet placement, and fixture installation. Separate standards, such as OSHA’s construction rule, set minimum illuminance for specific work areas. Illuminance measures how much light reaches a surface and is expressed in foot-candles or lux.
Calculating Lighting Loads
For dwelling units, use a minimum of 3 volt-amperes (VA) per square foot of floor area to calculate the general lighting load under NEC 220.41. This unit load also covers the receptacle outlets specified in that section.
In commercial settings, use the occupancy values in NEC Table 220.42(A) to calculate the minimum lighting load. For feeder and service calculations, apply the demand factors in Table 220.45 where permitted. For example, storage warehouses count 100% of the first 12,500 VA and 50% of the remainder. Occupancies listed under “All others,” including offices and retail stores, count 100% of the load.
Track lighting adds 150 VA for each 2 feet of track or fraction thereof to the feeder and service load under NEC 220.46(B). The rule excludes dwelling units and hotel or motel guest rooms and suites. If a device limits current to the track, you may calculate the load using that device’s rating.
Where Lighting Outlets and Controls Go
A lighting outlet is a wiring point for a luminaire or lampholder. Luminaire is the NEC term for a light fixture. The NEC requirements for lighting outlets and their controls depend on how the space is used.
Factor | Requirement |
Lighting control in dwelling units | Habitable rooms, kitchens, laundry areas, and bathrooms must each have at least one lighting outlet controlled by a listed device mounted on a wall near an entrance. NEC 210.70(A)(1) allows a receptacle controlled by a listed wall-mounted device to substitute outside kitchens, laundry areas, and bathrooms. |
Interior stairways in dwelling units | An interior stairway with six or more risers between floors must have a listed wall-mounted control device at each floor and at each landing with a stairway entry. The exception to NEC 210.70(A)(2)(3) allows remote, central, or automatic lighting control. |
Storage and equipment spaces | In any occupancy, attics, underfloor spaces, utility rooms, and basements used for storage or containing equipment that needs servicing must have at least one controlled lighting outlet. NEC 210.70(C) requires a control point at each entry that provides access to the space. If the outlet serves equipment that needs servicing, it must be at or near that equipment. |
Receptacle spacing in dwelling units | In rooms covered by NEC 210.52(A), no point measured horizontally along the floor line of a qualifying wall space may be more than 6 feet from a receptacle outlet. |
General-purpose branch-circuit capacity | NEC 210.23(B) permits a 15-amp general-purpose branch circuit to supply lighting and receptacle outlets within the applicable load limits. In dwelling units, those load limits determine how many outlets the circuit can serve. For non-dwelling load calculations, NEC 220.14(I) generally assigns at least 180 VA per receptacle yoke, subject to the applicable exceptions. |
Fixture Ratings and Clearances
Bathtubs, Showers, and Other Damp or Wet Locations
In homes and commercial buildings, luminaires must be marked for the damp or wet location where they are installed under NEC 410.10(A). A wet location requires a wet-location marking.
NEC 410.10(D)(1) prohibits cord-connected luminaires, luminaires hung by chains, cables, or cords, lighting track, pendants, and ceiling fans with light kits within a zone extending 3 feet horizontally and 8 feet vertically from the top of the bathtub rim or shower threshold. The zone includes the space directly above the tub or shower.
A separate rule in NEC 410.10(D)(2) applies within the tub or shower’s actual footprint, up to 8 feet above the rim or threshold. Luminaires in that space must be marked for damp or wet locations. Where shower spray makes the fixture location wet, NEC 410.10(A) requires a wet-location marking.
Recessed Fixtures Near Insulation
Under NEC 410.116(B), keep thermal insulation out of the space above a non-Type-IC recessed luminaire and at least 3 inches away from its housing, wiring compartment, and other components listed in that section. Type IC luminaires are identified for contact with insulation.
Closet lights
Apply the clearance requirements by measuring from the nearest point of the clothes closet storage space. Under 2023 NEC 410.16(D), surface-mounted incandescent or LED luminaires with a completely enclosed light source must have at least 12 inches of clearance when mounted on the wall above the door or on the ceiling. Surface-mounted fluorescent luminaires in those locations must have at least 6 inches of clearance. Recessed fluorescent luminaires and recessed incandescent or LED luminaires with a completely enclosed light source also require 6 inches. Surface-mounted fluorescent or LED luminaires identified for installation within the storage space may be installed there.
Other Lighting Standards and Energy Use
Construction-Site Illumination
While construction work is in progress, OSHA’s 29 CFR 1926.56, Table D-3, requires at least 5 foot-candles for general construction area lighting and for indoor corridors, hallways, and exitways. The lowest listed minimum is 3 foot-candles, which applies to accessways and certain other operations. A reading of 2 foot-candles falls below every minimum in the table. OSHA proposed rescinding the construction illumination rules in July 2025. The requirements remain in effect as of November 2026.
Energy Use
Lighting accounted for about 17% of electricity consumption in U.S. commercial buildings in 2018, according to the U.S. Energy Information Administration’s Commercial Buildings Energy Consumption Survey.
Switch Limits
For dwellings covered by the 2024 International Residential Code (IRC), Section E4001.15 limits electronic lighting control switches to five per branch circuit. It also limits them to 25 per feeder on the load side of a system or main bonding jumper.
Pro tip: Before finalizing a lighting design or installation, confirm the adopted NEC edition. State electrical code pages, such as Oregon’s Electrical Code Program page, publish local amendments. If your jurisdiction has adopted the 2026 NEC, JADE Learning’s overview of the latest standards can help you identify what changed.