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.
About the Author
Mike Holt
Mike Holt is the owner of Mike Holt Enterprises (www.MikeHolt.com), one of the largest electrical publishers in the United States. He earned a master's degree in the Business Administration Program (MBA) from the University of Miami. He earned his reputation as a National Electrical Code (NEC) expert by working his way up through the electrical trade. Formally a construction editor for two different trade publications, Mike started his career as an apprentice electrician and eventually became a master electrician, an electrical inspector, a contractor, and an educator. Mike has taught more than 1,000 classes on 30 different electrical-related subjects — ranging from alarm installations to exam preparation and voltage drop calculations. He continues to produce seminars, videos, books, and online training for the trade as well as contribute monthly Code content to EC&M magazine.
