Standards as High as Your Own
NECA Online Help Desk Please leave a message
Re: CQD answer published Thursday, March 22, 2017 -
That's not the question he was asking. He wasn't asking if there's a 200-amp breaker available for the service panel he is installing he is asking if a 200 amp service panel main load Center can support a secondary sub panel also rated at 200 amps! I believe the answer is no. A 200 amp main panel with a 200-amp main shut off cannot serve a two hundred amp sub panel. There may not be any NEC rule prohibiting this type of installation but I certainly do not install this way.
Hey Oliver thanks for your comment. But the answer is still yes, it is allowed, and can be done for various reasons even though it might not be the best design. As you mention there is not a rule that prohibits distribution equipment from supplying other equipment of the same (or even a higher) rating. Multiple panelboards could be supplied from one of equal or even lower rating - the key is that they are properly protected and the loads are not exceeded and that there is a circuit breaker of the size need available.
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: email@example.com.
© 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.