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The National Electrical Code (NEC), or NFPA 70, is a regionally adoptable standard for the safe installation of electrical wiring and equipment in the United States. It is part of the National Fire Code series published by the National Fire Protection Association (NFPA), a private trade association . [ 1 ]
Flexible metallic tubing (FMT; North America) is not the same as flexible metallic conduit (FMC) which is described in US National Electrical Code (NEC) Article 348. FMT is a raceway, but not a conduit and is described in a separate NEC Article 360. It only comes in 1/2" & 3/4" trade sizes, whereas FMC is sized 1/2" ~ 4" trade sizes.
The 1965 edition of the NEC, article 384-15 was the first reference to the circuit total limitation of panelboards. [1] As of 2008, the location of this language is at Article 408.54 now titled "Maximum Number of Overcurrent Devices." Non-CTL panels have not been made by reputable manufacturers since 1965.
While the various OSHA, ASTM, IEEE and NEC standard provide guidelines for performance, NFPA 70E addresses practices and is widely considered as the de facto standard for Electrical Safety in the Workplace. Practices include: Staging a "safe work zone" with boundaries, barricades, signs and attendants.
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(equivalent to NEC Class I, Group B) IIB Ethylene (equivalent to NEC Class I, Group C) IIA Propane (equivalent to NEC Class I, Group D) Zone 20, 21 & 22 IIIC Conductive dusts, such as magnesium (equivalent to NEC Class II, Group E) IIIB Non-conductive dusts, such as flour, grain, wood & plastic (equivalent to NEC Class II, Groups F and G) IIIA
The National Electrical Safety Code (NESC) or ANSI Standard C2 is a United States standard of the safe installation, operation, and maintenance of electric power and communication utility systems including power substations, power and communication overhead lines, and power and communication underground lines.
The original NEC, later known as NEC-1 after NEC-2 was introduced, was a modification of the earlier AMP2, adding a more accurate current expansion along wires and at multiple wire junctions, and an option in the wire modeling for far greater accuracy on thick wires.