ARTICLE 398. OPEN WIRING ON INSULATORS


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ARTICLE 398. OPEN WIRING ON INSULATORS
ARTICLE 398. OPEN WIRING ON INSULATORS398.2. Definition. Conductors for open wiring may be any of the general-use types listed in Table 310.104(A) for "dry" locations and "dry and wet" locations such as THW, XHHW, THHN, and so on.The conductors are secured to and supported by insulators of porcelain, glass, or other composition materials. In modern wiring practice open wiring is used for high-tension work in transformer vaults and substations. It is very commonly used for temporary work and is used for runs of heavy conductors for feeders and power circuits, as in manholes and trenches under or adjacent to switchboards, to facilitate the routing of large numbers of circuits fed into conduits.
Citation
Frederic P. Hartwell; Joseph F. McPartland; Brian J. McPartland: McGraw-Hill's National Electrical Code 2017 Handbook, 29th Edition. ARTICLE 398. OPEN WIRING ON INSULATORS, Chapter (McGraw-Hill Professional, 2017), AccessEngineering Export