National Electrical Installation Standards

Standards as High as Your Own

Thursday, December 27, 2018


Re: CQD answer published November 29 and December 18, 2018 -

1) Hi Charlie, Thanks for your work, I have not submitted in quite a while. By wrapping the grounding conductor around the raceway you will create a choke effect much like the old BX cable that used the spiral metal jacket as a grounding means. A thin uninsulated metal ribbon is installed inside the raceway to shunt the spiral coils and defeat the choke coil effect. Rick Munch CMP 1 2005 

2) I just want to say that I was very impressed with Jennifer's question regarding running the bonding conductor straight vs a spiral type of installation. Rich Van Wert



Hey Rick and Rich thanks for your comments and kind words. Once the 2020 NEC is published it will be open for Public Inputs. If you have thoughts about the need to install external bonding jumpers in a straight line along the raceway instead of being spiraled around it please submit a Public Input. You will likely need substantiation such as testing data or evidence of problems to support the change.

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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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