Code Question of the Day with Charlie Trout

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The National Electrical Code is the bedrock of the electrical construction business.

Do you know all the ins and outs of the Code? NECA and Electrical Contractor magazine are pleased to present their daily online feature, “Code Question of the Day.”

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Code Question Of The Day

Wednesday, July 30, 2014
Wednesday's Question:


I have a project where an existing indoor pool may or may not be grounded to the building's electrical system ground. The grid under the concrete had to be disturbed for pool repair. The new grid addition will be bonded to the existing grid. Are existing pools and new pools (whether indoor or outdoor) required to be grounded to the adjacent building's electrical system ground?

If, so how are they to be grounded?

I understand the equipotential bonding of the grid, pool equipment, and other metal equipment depending on distance from the pool. I have researched the 2014 NEC 680.6 Grounding (7) and it does not seem to be clear on this matter to me. It seems that the grid is not directly grounded to the building's electrical system ground. Also, are there certified installer/inspectors for this type of bonding and grounding? Could you explain this to me?

I have the 2014 NEC book and waiting on the 2014 NEC Handbook.

Thanks very much, William (Will) D. Middleton



Tuesday's code question and answer:
Tuesday, July 29, 2014


Section 210.12(B) requires arc fault breakers on existing branch circuits when the wiring is modified, replaced, or extended. Are arc fault breakers required when changing an existing panel and breakers if the branch circuit wiring is not replaced or extended, but are installed on a new breaker?

Thank you, Mike




Hey Mike thanks for your question. No, Arc-Fault Circuit-Interrupter Protection (AFCI) is not required in the situation you describe. In fact the branch circuit conductors can be extended up to 6 feet if no additional outlets or devices are installed. This could be the case if an existing panelboard was replaced and the existing cables were not long enough to reach the new panelboard or the AFCI circuit breaker.



Section: 210.12(B) Exception

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

ABOUT CHARLIE: Charles M. Trout, better known as Charlie, is 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.

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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.

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