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Branch circuits and feeders of 1000 V and less: protection, conductors, grounding, raceways and voltage drop, NEC 2023

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Protection

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Conductors

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    Choose the size

    Automatic finds the smallest size that meets the code. A chosen size is checked, and the grounding conductor grows with it (250.122(B)).

    4

    Installation

    Voltage drop
    Ground-fault check

    Informational. A bolted line-to-ground fault at the load with an infinite source, through the circuit conductor and the EGC at 75 °C (Table 9). Set the multiple to the breaker’s instantaneous pickup or the current at which the fuse clears quickly.

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    Branch circuit

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      Basis

      NEC 2023. Branch circuits by 210.19 and 210.20; feeders by 215.2 and 215.3; device ratings by 240.6(A); conductor protection by 240.4. Motors by Article 430 (430.6, 430.22, 430.32, 430.52, 430.62, 430.110); air-conditioning equipment by Article 440; fixed space heating by 424.4(B); storage water heaters by 422.11(E) and 422.13; EV charging by 625.41 and 625.42; dwelling feeders by 310.12.

      Ampacity from Table 310.16 (Table 310.20 for messenger-supported conductors) with Tables 310.15(B)(1)(1), 310.15(B)(1)(2) and 310.15(C)(1), limited by the terminal temperature (110.14(C)) and the wiring method (334.80, 340.80, 338.10(B)(4)(a)). Equipment grounding conductors by 250.122. Raceway fill by Chapter 9 Tables 1, 4, 5, 5A and 8 and the published cable diameters (Note 9). Minimum cover by Table 300.5; overhead clearances by 225.18.

      Voltage drop with Chapter 9 Table 9 at 75 °C and the stated power factor, at the load current. Cable constructions from the manufacturer specifications named with each drawing.