The rules for sizing branch-circuit, feeder, and service conductors have been simplified. Article 210 Branch Circuits Part II. Branch-Circuit Ratings 210.19 Conductor Sizing (A) Branch Circuits (1) General. Branch-circuit conductors must have an ampacity of not less than the maximum load to be served. The conductor must be the larger of (a) or (b). (a) Conductors must be sized no less than 125% of the continuous loads, plus 100% of the noncontinuous loads, based on the terminal ...

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