National Electrical Installation Standards

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Friday, March 17, 2017

Question:

Re: CQD answer published Friday, March 10, 2017 -Barn Feeder

Charlie, in the question about the barn supplied by a feeder you said that two ground rods are needed unless the 25 ohm rule is met. Is that enough or are other electrodes required.

Thank you, Taylor

A

Answer:

Hey Taylor thanks for your follow up question. Buildings and structures supplied by feeders must have a grounding electrode system that complies with Part III of Article 250 as stated in 250.32(A). Any and all of the grounding electrodes in 250.52(A)(1) through (A)(7) that exist must be bonded together and used as the grounding electrode system as stated in 250.50. If no grounding electrodes exist then one or more of the ones in 250.52(A)(4) through (A)(8) must be installed such as two ground rods or a single ground rod that meets the 25 ohm resistance value.

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      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.

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