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.”

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    Tuesday, October 16, 2018


    A metal cabinet contains service conductors, their splices, and current transformers (CT), and is located upstream of an 800-amp service disconnecting means. The CT cabinet has only PVC raceways entering and exiting the enclosure, and the engineered drawings do not show any supply-side bonding jumpers in the PVC raceways.  Is it correct to assume that this metal CT enclosure must be connected to a supply-side bonding jumper?  If so, what is the correct size bonding jumper?  Should supply-side bonding jumpers have been included in the drawings?

    Although NEC Table 250.102 (C)(1) provides sizes of supply-side bonding jumpers, there seems to be no specific text section that references this table for metal enclosures.  I have looked at 250.80, 250.92, and 250.102 (C).  Can you help me connect the NEC dots to size supply-side bonding jumpers to metal CT enclosures?

    Curtis Lichty

  • ?
    Monday, October 15, 2018


    Re: CQD answer published Monday, October 8, 2018 -GFCI Protection in Kitchens

    For the question posted for Friday, October 5, 2018, "Do all circuits in a Kitchen need to GFCI, or only those at the counter top?"

    Your answer didn't include 210.8(D) Kitchen Dishwasher Branch Circuit. GFCI protection shall be provided for outlets that supply dishwashers installed in dwelling unit locations. To me, since the dishwasher receptacle could be outside of the 6' to sink rule then 210.8(D) makes the use of GFCI protection an absolute.




    Hey Rich thanks for your comment. Good point, we should have included the 210.8(D) reference to kitchen dishwasher branch circuits in our answer.

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 for more information. NEISÔ can be purchased in three formats: as paper books, on CD, or as electronic downloads.

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