Equipment & SystemsQuestion 306 of 521
How is the maximum current of a PV source circuit determined for conductor and overcurrent sizing?
a.By the rated operating current only
b.1.0 times the short-circuit current
c.0.8 times the short-circuit current
d.1.25 times the short-circuit current (Isc)
Explanation
Section 690.8(A) sets the maximum PV source-circuit current at 1.25 times the module short-circuit current (Isc) to account for irradiance above standard test conditions. Conductors and overcurrent devices are then sized per 690.8(B); using only the operating current or a factor of 1.0 would undersize the circuit.
Law Reference: 2023 NEC §690.8Practice all 521 questions free — no signup required.
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