National Electrical Installation Standards

Standards as High as Your Own

?
Friday, June 1, 2018

Question:

In a new RV park where we have power pedestals with receptacles for RV's to plug in, My understanding of Art 551 is that grounding is accomplished with a grounding conductor with the feeder conductors. And, the grounded and grounding conductors are not bonded at each pedestal. Am I correct?

Ronald Chiaratti

A

Answer:

Hey Ronald thanks for your question. Yes, you are correct. A change to the 2017 NEC in 551.75(B) now clearly states that a grounding electrode is not required at Recreational Vehicle power outlets or supply equipment - unless they are used as service equipment. An equipment grounding conductor is required as stated in 215.6 which references 250.134. Grounded conductors are not allowed to be reconnected to ground or to equipment grounding conductors on the load side of the service disconnecting means as stated in 250.24(A)(5).

ABOUT CQD: NECA’s Code Question of the Day (CQD) is a leading National Electrical Code® forum for NECA and the industry. The CQD generates a lively dialogue and relative practical and Code-based responses to an ever-increasing and interactive audience.

IMPORTANT NOTICE: All answers are based on the latest edition of the National Electrical Code®, unless the question requests a response based on a specific edition. This correspondence is not a formal interpretation of the NEC®. Any responses expressed to the questions are opinions and do not necessarily represent the official position of NECA, NFPA, or any technical committee. In addition, this correspondence is neither intended, nor should it be relied upon, to provide professional consultation or services.

ABOUT CHARLIE: Charles M. Trout, better known as Charlie, was a nationally known NEC® expert and author. He served on several NEC® technical committees and is past chairman of CMP-12. In 2006 Charlie was awarded the prestigious Coggeshall Award for outstanding contributions to the electrical contracting industry, codes and standards development, and technical training. Charlie was also a member of NECA’s Academy of Electrical Contracting. Charlie’s experienced team of industry experts keep the CQD dialogue and discussions active and informative in the spirit of the man himself, as he wanted.

NECA STANDARDS: NECA publishes the National Electrical Installation Standards™ (NEIS™), a series of ANSI-approved performance and quality standards for electrical construction. Visit NECA-NEIS.org for more information. NEISÔ can be purchased in three formats: as paper books, on CD, or as electronic downloads.

NECA SAFETY PRODUCTS: NECA publishes valuable electrical safety books and CDs for the industry. Visit necanet.org/store to view or purchase NECA safety products.

 CONTACT US: To submit a Code question, subscribe, or unsubscribe from this list, please e-mail: codequestion@necanet.org.