Load Calculation Requirements for Shore Power Receptacles

The demand factor for marina load calculations of 45 shore power receptacles is ____%.

a) 40
b) 50
c) 60
d) 70

See answer and applicable Code reference

The correct answer is: b) 50

The installation rules at marinas and boatyards is covered in Art. 555 of the NEC. The load calculation requirements for service and feeder conductors can be found in Sec. 555.12. As noted in Table 555.12, a demand factor of 50% shall apply when running calculations for 45 shore power receptacles.


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