National Electrical Installation Standards

Standards as High as Your Own

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  • December 5, 2018

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  • December 4, 2018

    We are installing double throw switches upstream of an existing HVAC Unit. The (2) incoming sources are an existing 100A-3P circuit breaker, and a 110A-3P circuit breaker. Can we install 100A-3P double throw switches, or by code do we need to install 200A double throw switches? Richard Rapp
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  • December 3, 2018

    Can a cooktop and wall oven be on the same circuit? Ken Prinkey
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  • November 30, 2018

    Re: CQD answer published Friday, November 16, 2018 -Cables in Raceways Is response to the question published November 16, 2018. You should also point out the correct conduit fill requirements when dealing with elliptical cables. This is found in note 9 to Table 1 from Chapter 9. This requires that a multiconductor cable, optical fiber cable or flexible cord of two or more conductors be treated as a single conductor. Elliptical cable must use the large diameter of the cable as a circle diameter. This can lead to conduits much larger than what the cable will actually fit in being necessary. Regards, Jeff Bower
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  • November 29, 2018

    Is it ok to feed the entire sub panel powering the pool equipment with one double pole gfci breaker. Does this satisfy the gfci protection requirement for the entire pool? Is this better or worse than individual gfci breakers in the sub panel. Thank You Bob Schwarzlose
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  • November 28, 2018

    Can you externality wrap a bond wire around a piece of liquid tight flex with bonding connecters on the flex or does it have to follow straight with the flex John Mcnair
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  • November 27, 2018

    If a Siemens panel is listed for their own "QP" style breakers, are you allowed to use another manufacturer's "QP" breakers? The label lists "QP" breakers as compatable but doesn't note a specific manufacturer. Barry J Yeslow
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  • November 26, 2018

    680.25(A)(1) Ex. Had a question ask of me concerning a feeder to a pool panel, what I discovered is I have three code books that do not have the exception and two that do??? Also our handbook does not have the exception?? Have you had this brought to your attention?? It is an important change in the 2014!!!!! thx THOMAS J. COUCH
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  • November 23, 2018

    The question I have is the color coding on Nonmetallic cable type NM-B. I realize all manufactures are using the yellow color jacket for #12 gauge and orange for #10. Is this a required standard per UL? Can #12 white jacket still be used? Thank You, Jim Bevo
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  • November 22, 2018

    How many outlets (including GFCI) can be included on a 20-amp kitchen circuit for small appliances? Keith Bernhard
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  • November 21, 2018

    Dear sir, As per NEC, I need to know that can I use one panel board for 04 buildings and each building has 6 maximum circuits used.(Two living rooms and one toilet in each building) OR should we need one panel board for each building? for your kind information the building is office staff housing and these 04 buildings are located next to each other with separate entrance which means no individual meter for each building. Please guide me. Regard, Usman Ali Khan
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  • November 20, 2018

    Re: CQD answer published Thursday, November 8, 2018 - Service Entrance Cable Folks, Do not forget SE and USE are not allowed to be installed in conduit underground. Cordially, Bill Nolte, C.S.H.O.
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  • November 19, 2018

    Can we use the equipment grounding conductor as a current carrier for a sensing device in a existing structure? John Kendall
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  • November 16, 2018

    Re: CQD answer published Monday, November 5, 2018 Code Question of the Day for 11/05/2018 So every person at CQofD is a man? Or are only the men doing a great service? Publishing that gender-specific salutation is not helping the stereotype that only white males can be engineers and electricians. Friday, November 2, 2018 Gentlemen, your doing a great service,,, Thursday answer referencing the… Lori Weidner
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  • November 15, 2018

    Can direct burial cable (UF) be installed in PVC conduit? Jimmie (Jim) Cuba
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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.

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