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Article 411 Low-Voltage Lighting

National Electrical Code 2020 of Minnesota > 4 Equipment for General Use > 411 Low-Voltage Lighting

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411.1 Scope

This article covers lighting systems and their associated components operating at no more than 30 volts ac or 60 volts dc. Where wet contact is likely to occur, the limits are 15 volts ac or 30 volts dc.

Informational Note: Refer to Article 680 for applications involving immersion.

411.3 Low-Voltage Lighting Systems

Low voltage lighting systems shall consist of an isolating power supply, low-voltage luminaires, and associated equipment that are all identified for the use. The output circuits of the power supply shall be rated for 25 amperes maximum under all load conditions.

411.4 Listing Required

Low-voltage lighting systems shall comply with 411.4(A) or (B). Listed low-voltage lighting systems or a lighting system assembled from listed parts shall not be permitted to be reconditioned.

(A) Listed System

The luminaires, power supply, and luminaire fittings (including the exposed bare conductors) of an exposed bare conductor lighting system shall be listed for the use as part of the same identified lighting system.

(B) Assembly of Listed Parts

A lighting system assembled from the following listed parts shall be permitted:

Low-voltage luminaires identified for the use
Power supply identified for the use
Low-voltage luminaire fittings identified for the use
Suitably rated cord, cable, conductors in conduit, or other fixed Chapter 3 wiring method for the secondary circuit

411.5 Specific Location Requirements

(A) Walls, Floors, and Ceilings

Conductors concealed or extended through a wall, floor, or ceiling shall be in accordance with (1) or (2):

Installed using any of the wiring methods specified in Chapter 3
Installed using wiring supplied by a listed Class 2 power source and installed in accordance with 725.130

(B) Pools, Spas, Fountains, and Similar Locations

Lighting systems shall be installed not less than 3 m (10 ft) horizontally from the nearest edge of the water, unless permitted by Article 680.

411.6 Secondary Circuits

(A) Grounding

Secondary circuits shall not be grounded.

(B) Isolation

The secondary circuit shall be insulated from the branch circuit by an isolating transformer.

(C) Bare Conductors

Exposed bare conductors and current-carrying parts shall be permitted for indoor installations only. Bare conductors shall not be installed less than 2.1 m (7 ft) above the finished floor, unless specifically listed for a lower installation height.