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The Code Question of the Day (CQD) is NECA and ELECTRICAL CONTRACTOR Magazine’s flagship National Electrical Code (NEC®) public forum for the industry, sponsored by EATON.

The daily distribution of Q&A generates a lively dialogue and shares relative Code-based practical responses.

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  • ?
    Monday, October 2, 2023

    Question:

    Good morning, all. We recently amended a duct bank and some underground wiring that was discovered to be using PVC conduit Types EB-20 and DB-120, which are not UL listed. However, the DB-120 does have "NEMA TC-8" stamped on the exterior. Does it meet Code to reuse these conduits? All the best, Cristian Sislater
  • ?
    Friday, September 29, 2023

    Question:

    Hi CQD, thanks for all the great information. I own a small electrical contracting company that primarily does residential wiring. One of my customers also owns some commercial office buildings and has asked me to wire some of the spaces being remodeled. I met with electrical inspector regarding permitting and plan review, and they informed me that there are energy conservation requirements that must be met. I could not find anything in the NEC regarding energy conservation, other than the in Section 220.42(B) regarding load calculations. Where can I find the energy conservation rules for electrical systems? Thanks in advance, George M
    A

    Answer:

    Hello George, glad to hear you enjoy the CQD. Energy conservation falls outside of the purpose of the NEC® established in Section 90.2 as energy conservation is more of a design specification. The energy conservation rules used will depend on the local jurisdiction, as they are all a little different based on geographical needs. The most commonly used are the:

    International Energy Conservation Code (IECC) published by the International Code Council (ICC) and ANSI/ASHRAE 90.1, Energy Standard for Buildings Except Low-Rise Residential Buildings, published by Illuminating Engineering Society (IEC). Your local AHJ will have more information on which energy code and which edition is used in your area.

ABOUT CQD: The Code Question of the Day (CQD) is NECA and ELECTRICAL CONTRACTOR Magazine’s flagship National Electrical Code (NEC®) public forum for the industry, sponsored by EATON. The daily distribution of Q&A generates a lively dialogue and shares relative Code-based practical responses.

SUBMIT YOUR CODE QUESTION: Click here to submit a question to for inclusion in an upcoming edition of the Code Question of the Day, or email codequestion@necanet.org. 

CHARLIE TROUT: 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. Even though Charlie passed away in October of 2015, his work continues in spirit. NECA continues to maintain this question forum for its many subscribers in memory and recognition of all his significant contributions to making the NEC what it is today.

NECA STANDARDS: NECA publishes the National Electrical Installation Standards™ (NEIS™), a series of ANSI-approved performance and quality standards for electrical construction. NEIS can be purchased in the NECA Store in three formats: a printed or  PDF download of a standard or, as an  annual subscription service.

NECA SAFETY PRODUCTS & PUBLICATIONS: NECA produces electrical safety publications and products for the industry including jobsite safety guides, handbooks and resource kits. View a full listing of available resources and products »

IMPORTANT NOTICE: Unless the question requests a response based on a specific edition, all answers are based on the latest edition of NFPA 70® National Electrical Code®.

This correspondence is not a formal interpretation of the NEC® and any responses expressed to the questions are opinions and do not necessarily represent the official position of NECA, NFPA, the NEC Correlating Committee any Code-making panel or other electrical technical committee. In addition, this correspondence is neither intended, nor should it be relied upon, to provide professional consultation or services. 

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