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.


  • ?
    Friday, January 17, 2020

    Question:

    Gentlemen, I’m hoping you can help with an opinion.

    As you seem to understand how to apply the NEC rules from a practical viewpoint. Section 230.72 indicates the two to six service disconnects permitted in Section 230.71 must be grouped. There is no maximum distance on between the two to six disconnects, so how far is too far before the installation would not meet the grouping requirement. Could signage be installed to assist in meeting the grouping requirement? Any opinions would be very appreciated.

    Mark Taylor 

  • ?
    Thursday, January 16, 2020

    Question:

    Can electrical metallic tubing (EMT) be installed to supply a fire pump. The installation would be from the load side of the fire pump controller overhead on a ceiling of the fire pump room and then a vertical drop of the ceiling to the motor. There would be a transition from EMT to liquid-tight flexible metal conduit within 2 feet of the motor terminal housing. Job specifications are calling for rigid metal conduit.

    Thanks for any Code view on this,

    Mike Long

    A

    Answer:

    Hi Mike,

    The short answer is yes. Section 695.6(D) includes EMT as a wiring method recognized for use between the fire pump controller and the motor(s). That said, remember the Code is the minimum, meaning one must do at least that much. A job specification or engineering design may be more restrictive than the NEC requirements. Probably best to check with the local electrical inspector (AHJ), engineer or designer, and possibly the owner. 

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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.

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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