A. Except as permitted by Sec. 240.21(A) through (H), overcurrent devices must be placed at the point where the branch-circuit or feeder conductors receive their power. Taps and transformer secondary ...
In the 2017 National Electrical Code (NEC), there are plenty of tap rules in Sec. 240.21 and Sec. 240.92 for circuits not more than 1,000V. The same is true for transformer secondary conductor rules.
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