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,” Sponsored by Eaton.

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    Wednesday, November 13, 2019


    Re: CQD answer published Wednesday, November 6, 2019 - Emergency circuits

    1) Totally disagree with Tuesdays answer.  the circuits are kept separate but may run the entire length of a row of lighting picking up the EM ballasts drops. He did not say they were Emergency Backed up circuits off a Standby generator which must be separated. Bill Schell

    2) Good morning and thank you for your great work assisting by brother and sister electricians in the industry. Regarding the emergency wiring in the fixtures with the regular lighting circuit and beg to differ with your answer. It seems from 700.10 that the restriction is when the emergency power is from an "emergency source, or emergency distribution overcurrent protection." An emergency source would be a generator or battery back-up pack remote from the emergency light. However, when the power feeding the emergency ballast is also the circuit that feeds the lighting circuit then this would not fit the restriction of 700.10(B). All the best, Jeff Glanstein
  • ?
    Tuesday, November 12, 2019


    Does garbage disposal need to be gfi protected?  

    Ronald Perez


    Hey Ronald thanks for your question. Not specifically. The five types of appliances in 422.5(A) must have GFCI protection under the conditions stated. If the manufacturers instructions require GFCI protection then it must be provided as stated in 110.3(B). Additionally if it is supplied by a receptacle and the receptacle is in a location described in 210.8 then GFCI protection must be provided.

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.

NECA SAFETY PRODUCTS: NECA publishes valuable electrical safety books and CDs for the industry. Visit to view or purchase NECA safety products.

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