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NFPA 921 is the field's leading reference for safe and systematic fire and explosion investigations.
Whether you're investigating a residential fire or a complex industrial disaster, the most important resource for fire investigators, litigators, and insurance professionals is NFPA 921: Guide for Fire and Explosion Investigations. This trusted Guide addresses every stage of a very complex process -- from basic fire investigation methodology to collecting evidence to failure analysis. Each edition is updated based on the most recent court cases, scientific data, and trends, to help you offer expert testimony and render opinions that stand up to scrutiny.
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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.