Standards as High as Your Own
NECA Online Help Desk Please leave a message
Re: CQD answer published Thursday, July 12, 2018 -NM Cable in Fire Rated Construction
1) Steve should also be aware that the Massachusetts Electrical Code has amendments for the use of type NM cable
2) What code section prohibits the use of NM cable in fire rated construction? 334.10 does not limit the use to only nonrated construction. See NEC 334.10 #3. All that is required is a 15 minute finish rating which is not even 1/2 inch drywall. Fire stopping/caulking manufacturers actually have details showing electrical cables of all types in their fire rated penetration detailing. Please clarify where this is in the code. Thanks, Matt Varvel
3) BAD ANSWER, Joseph Hertel
Hey all y'all thanks for your comments.
1) Information on the Massachusetts NEC amendments can be found here:
2) The question described a structure that was "fire rated on the parking level with conventional lumber" used for higher floors. Our vision was masonry construction (noncombustible for the parking level such as poured concrete with no provisions for wiring embedded in the masonry or no additional finish material. If that floor was required to be of Type I or II then NM cable is not allowed to be installed. If that floor was permitted to be Types III, IV, or V construction, but Type I or II was used by choice, then NM cable is allowed if within a 15-minute finish rating as stated in 334.10(3).
3) Shouting BAD ANSWER is not helpful.
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. NEISÃ” 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: firstname.lastname@example.org.
© 1999 – 2014 National Electrical Installation Standards. All rights reserved.
Brought to you by NECA. NECA is the voice of the electrical contracting industry NATIONAL ELECTRICAL INSTALLATION STANDARDS, NEIS and the NEIS logo are registered trademarks of the National Electrical Contractors Association.
Created by Matrix Group International, Inc.