Services & DistributionQuestion 61 of 521
A service supplies a continuous load of 80 A and a noncontinuous load of 100 A. What is the minimum required ampacity of the service-entrance conductors?
a.180 A
b.225 A
c.200 A
d.160 A
Explanation
Service-entrance conductors must have an ampacity not less than the noncontinuous load plus 125% of the continuous load: 100 + (80 x 1.25) = 200 A. Simply adding the loads (180 A) ignores the 125% continuous factor, and 225 A applies the factor to the total load in error.
Law Reference: 2023 NEC §230.42Practice all 521 questions free — no signup required.
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