National Electrical Installation Standards

Standards as High as Your Own

?
Wednesday, November 21, 2018

Question:

Dear sir,

As per NEC, I need to know that can I use one panel board for 04 buildings and each building has 6 maximum circuits used.(Two living rooms and one toilet in each building) OR should we need one panel board for each building? for your kind information the building is office staff housing and these 04 buildings are located next to each other with separate entrance which means no individual meter for each building. Please guide me.

Regard, Usman Ali Khan

A

Answer:

Hey Usman thanks for your question. Using one panelboard to supply the circuits in 4 buildings can have many possible problems depending on the details of the installation. Each occupant must have ready access to the overcurrent devices for their occupancy unless continuous building management is provided as stated in 240.24(B) (1) & (2). Buildings supplied by branch circuits or feeders must generally be supplied by one of those unless special conditions exist as stated in 225.30. Installing a separate panelboard for each building will be a much better and safer installation even if you can meet the conditions that would allow you to use one for all of them.

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.