National Electrical Installation Standards

Standards as High as Your Own

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.”


  • ?
    Thursday, December 13, 2018

    Question:

    Charlie,

    Why is the size in mm for a 2/0 bare conductor different in the first column of Table 8 in Chapter 9 than the column for overall size? I never noticed before because I usually look for the inches and not metric.

    Thank you,

    Claudia

  • ?
    Wednesday, December 12, 2018

    Question:

    Re: CQD answer published Friday, November 30, 2018 -Pool Eq GFCI Protection

    Gentlemen: I remember Charlie and used to have many conversations with him at IAEI functions over the last 25+ years. We miss him. I am an avid reader of Code question and would like to offer a possible correction to your answer of Thursday, Nov 29, 2018. My understanding of Article 680.23(A)(3) is that an underwater luminaire for a pool must have GFCI protection “in the branch circuit” and that’s the way I’ve been teaching it in my classes. This is different that what is called out for other equipment like the pool cover, pump motors, etc. If the feeder for the panel is GFCI protected it would require an additional GFCI device in the “branch circuit” for the underwater luminaire even if the branch circuit originated from a panel that was protected by a GFCI Main. Thanks for the fine job you are doing for the industry. George Little

    2) Good morning. Please correct me if I’m wrong, But in regards to the answer given concerning the GFCI protection for pool equipment being located in the feeder for a pool sub panel. If there are underwater Luminaires installed you must pay attention to 680.23(A)(3). Gfci protection for luminaires must be located in the branch circuit. Barry Wilbur

    A

    Answer:

    Hey George and Barry thanks for your comments and the kind words. You are both correct the GFCI protection for underwater luminaires must be in the branch circuit as stated in 680.23(A)(3). For other pool equipment it can be in the feeder. We miss Charlie also.

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.

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