Change No. 7: Section 310.15 (Conductor Ampacity)
As always, many changes to the rules for establishing conductor ampacities have been made, including requirements for cable bundling, rooftop temperature correction, and dwelling service conductor sizing. (A) General Requirements. (1) Tables for Engineering Supervision. The ampacity of a conductor can be determined either by using the tables in accordance with Sec. 310.15(B), or under engineering supervision as provided in 310.15(C). Note 1: Ampacities provided by this section ...
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