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Code Q&A: Maximum Code Allowable Voltage for Pier Power Distribution Systems

Oct. 27, 2022

Test your knowledge of the NEC.

Based on the 2020 NEC.

Q. What is the maximum Code allowable voltage for pier power distribution systems in marinas and boatyards?

See answer below.

A. Pier power distribution systems must not exceed 250V phase to phase. Pier power distribution systems, where qualified personnel service the equipment under engineering supervision, are permitted to exceed 250V but these systems must not exceed 600V. (Sec. 555.5)

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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.