Services & DistributionQuestion 57 of 521
Under the 10-ft feeder tap rule, the tap conductors must have an ampacity not less than what value relative to the load and the device they supply?
a.25% of the feeder OCPD
b.Equal to the feeder OCPD
c.50% of the feeder ampacity
d.The load served, and at least the rating of the device/overcurrent it supplies
Explanation
Per 240.21(B)(1), 10-ft tap conductors must have an ampacity not less than the combined computed load and not less than the rating of the device or OCPD they terminate in. Fixed percentages of the feeder OCPD/ampacity are not the correct basis for the 10-ft rule.
Law Reference: 2023 NEC §240.21(B)Practice all 521 questions free — no signup required.
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