NFPA 70®: National Electrical Code® (NEC®) is the basis for electrical safety that has saved countless lives.
Adopted in all 50 states, the NEC helps protect people and property from electrical hazards involving wiring and equipment. Comprehensive provisions address electrical installations in virtually all buildings -- including commercial, residential, and industrial occupancies. Revisions to the NEC are industry-driven, based on public proposals and comments. Each edition of the Code builds on the next, through consensus-based changes that reflect the evolving needs of the field, emerging technologies, and new information about electrical safety.
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Sample (NEC® 2014)
411.2411.3 Definition. Low-Voltage Lighting Systems.
(A) General. Lighting Ssystems Ooperating at 30 Volts- volts or Less. A lighting system consisting less shall consist of an isolating power supply, the low-voltage luminaires, and associated equipment that are all identified for the use. The output circuits of the power supply are shall be rated for not more than 25 amperes and operate at 30 volts (42.4 volts peak) or lessmaximum under all load conditions.
(B) Class 2. Listed Class 2 lighting equipment shall be rated in conformance with Chapter 9, Table 11(A) or Table 11(B).
411.3411.4 Listing Required. Lighting systems operating at 30 volts or less shall comply with 411.3(A)411.4(A) or
411.3(B).411.4(B). Class 2 power sources and lighting equipment connected to Class 2 power sources shall be llisted.