National Electrical Installation Standards

Standards as High as Your Own

 

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.

  • ?
    Wednesday, December 7, 2022

    Question:

    Hello Code Guru, thanks for your daily service to the trade. I just wanted to add a comment to the CQD dated Monday, November 7, 2022:

     “Hello CQD, I am a licensed electrician working with a general contractor on a renovation project in a two-family residence in Massachusetts. Approximately 75% of the entire building will be completely renovated (down to the studs). The GC would like to leave the remaining 25% of the building as is, including the power, lighting, and heating circuits. I would prefer to replace all power. lighting and heating circuits in the entire house since the house is approximately 100 yrs. old and the existing wiring is a combination of very old Romex and BX. Is there a code requirement or state regulation which mandates that the entire building must be brought up to current code for a situation such as this?”

    Thanks, Eric Krist
  • ?
    Tuesday, December 6, 2022

    Question:

    Greetings Charlie! Love this forum. You do an excellent job. My question is regarding 300.21. There seems to be some debate on whether all wall penetrations need to be fire stopped or just penetrations through fire rated walls. Could "Substantially increased" apply to any wall penetration? Local AHJ's seem to differ a bit here as well. What is your take? Thank you! Jason Rolf
    A

    Answer:

    Hi Jason, thank you for the kind words, glad to hear you enjoy the CQD. Section 300.21 is made up of two parts/sentences, with the first sentence establishing the intent:

    “Electrical installations in hollow spaces, vertical shafts, and ventilation or air-handling ducts shall be made so that the possible spread of fire or products of combustion will not be substantially increased”.

     The second part/sentence establishes the rule:

    “Openings around electrical penetrations into or through fire-resistant-rated walls, partitions, floors, or ceilings shall be fire-stopped using approved methods to maintain the fire resistance rating.”

    This would indicate that only those penetrations through fire-resistant-rated walls, ceilings, etc. need to be fire-stopped to maintain the fire-resistance-rating.

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.

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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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