Q. Please explain the 25-ft tap rules in the NEC?
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A. Feeder tap conductors up to 25 ft long are permitted without overcurrent protection at the tap location if the tap conductors comply with the following [240.21(B)(2)] (see Figure):
• The ampacity of the tap conductors must not be less than one-third the rating of the overcurrent device that protects the feeder [240.21(B)(2)(1)].