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.”


  • ?
    Friday, August 17, 2018

    Question:

    Does a 24v connection have to in a box

    Steve Farrington

  • ?
    Thursday, August 16, 2018

    Question:

    I have a job at the NIH facility in Bethesda Maryland that I need to run a nitrogen line to a room being remodeled. We want to run the nitrogen line through an electrical room. The nitrogen line would run over several electrical panels. Can I run the nitrogen line over the electrical panels, Is this acceptable with the NEC codes? Nitrogen is non combustible in fact it takes the air away from a fire should a fire start in the electrical panel. I would appreciate your response to this question, Thanks for your time. If the nitrogen line can run in the electrical room code you please provide me with a code number.

    Walt Ugolick

    A

    Answer:

    Hey Walt thanks for your question. The NEC does not specifically define electrical rooms or generally require them. Spaces about electrical equipment operating at 1000 volts and less is covered by 110.26. Switchboards, switchgear, panelboards, and motor control centers have dedicated space rules as stated in 110.26(E). The dedicated space is the depth and width of the equipment and extends to 6 feet above the equipment unless a structural ceiling is lower than the 6-foot dimension. If the "panels" in your example are actually panelboards then the nitrogen lines cannot be located in the dedicated space but could be located above the dedicated space if any space exists above the 6 ft dimension.

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.

CONTACT US: To submit a Code question, subscribe, or unsubscribe from this list, please e-mail: codequestion@necanet.org.