3.3K views · 115 reactions | Factors that impact conductor sizing include not only conductor ampacity and equipment terminal temperature rating, but also the conductor insulation temperature rating. In this video we discuss Table 310.4(A) which provides information on conductor insulation properties such as letter type, maximum operating temperature, application, insulation, and outer cover properties… | Mike Holt Enterprises | Facebook
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To determine what size feeder is needed to carry a certain amount of current, the temperature rating of the conductor and associated terminals must be taken into consideration. Factors that impact feeder sizing include conductor ampacity, equipment terminal temperature rating, continuous load factors, overcurrent protection requirements, conductor insulation temperature rating, ambient temperature corrections, and conductor bundling adjustment. At first glance all of this may seem a bit overwhel
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64K views · 1.4K reactions | Mike Holt Circuit Sizing - Air-Conditioning Sizing air-conditioning circuits are really simple. Just read the nameplate and use the NEC Table 310.16 (2020 NEC) and 240.4(D) and 240.4(G), 240.6, and 440.6(B). | Mike Holt Enterprises | Facebook
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When more than three current-carrying conductors are bundled (not maintain spacing) for more than 24 inches, the ampacity of the conductors at 90C [310.15(A)] must be adjusted in accordance with Table 310.15(C)(1). For example, the adjusted ampacity of 12 AWG, where there is nine current-carrying conductors bundled for more than 24 inches is 21A (30A x 70%). (#electrican #electricalcontractor #mikeholt #sparkylife #electricalapprentice | Mike Holt Enterprises
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When more than three current-carrying conductors are bundled (…
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