Wire Sizing

Minimum conductor per NEC Table 310.16 with 110.14(C) terminal limits, 310.15(B)(1) ambient correction and 310.15(C)(1) adjustment for more than 3 current-carrying conductors.

Continuous load (A) Non-continuous load (A) Insulation rating Terminal rating Ambient temp Units Current-carrying conductors

Raceway on rooftop, less than 7/8 in. above roof (+33°C)

Table 310.16 (30°C, ≤3 CCC)

Neutral counts as current-carrying only when it carries unbalanced current of a 3-phase wye or most-nonlinear loads (310.15(E)). EGCs never count. NM cable is limited to the 60°C column (334.80).

Reference only — not engineering, legal, or code-compliance advice. Results are estimates for qualified persons and must be verified against the NEC edition adopted where the work is done (your selected edition), manufacturer instructions, and the local AHJ. Use is subject to the Terms of Use & Disclaimer. — Morningstar Electric LLC