Standards as High as Your Own
NECA Online Help Desk Please leave a message
A 12" deep panel is flush mounted in a 8" block wall (Question #1: Allowed?). In the opposing room, there are (2) 6" conduits mounted to strut that has been fastened to the rear 4" of the panel that is sticking out of the wall, which leads to Q2, is mounting the strut to the back of the panel allowed? I found no such information on panels that stick through walls in the NEC, except possibly not a neat and workmanlike installation (110.12).
Thank you. John Kreider
Hey John thanks for your question. I believe you are referring to panelboards. Panelboards are actually the busses and overcurrent devices and are designed to be placed in a cabinet or cutout box against or in a wall as that term is defined in Article 100. Cabinets can be surface or flush mounted as they are defined in Article 100. Unless there is something in the listing instructions or a concern about the wall having a fire-resistant rating, the NEC does not specifically prohibit the cabinet from extending past the back side of the wall.
Raceways must be secured and supported as stated in 300.11 and by any requirements based on the specific raceway used in the .30 section of the applicable Article. Those rules restrict some things from being used for support but they do not specify what must be used to support the raceways. It is quite possible the installation is installed in a neat and workmanlike manner so even 110.12 might not apply. So, a lot of words for it might not be a violation.
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.