National Electrical Installation Standards

Standards as High as Your Own

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Friday, April 12, 2019

Question:

Re: CQD answer published Fri day, March 29, 2019 -Device

Hi all great job here. Regarding your answer to Safa on 03/28/19 I must expand upon your answer and say that a multipole breaker is a single device. For example, while a 2-pole breaker might consist of two single pole breakers, it is a factory constructed single assembly. When I buy a 2-pole breaker I am charged for one item, not two. I understand the wording might be tricky, but while a 2-pole breaker is a single device it is also counted as two overcurrent devices. Also, you made a reference to article 250.15 which I believe is a typo that should read 240.15 so you might want to correct that. Thanks again for all you do for us.

Richard Cressotti
A

Answer:

Hey Richard thanks for your comment and the compliment. Yes, a multi-pole circuit breaker is a single product but the original question asked how many overcurrent devices is a two-pole circuit breaker. You are correct, the reference should have been 240.15(A) which requires a fuse or overcurrent trip unit of a circuit breaker for each ungrounded circuit conductor. The definition of Device in Article 100 also uses the word unit and the last sentence of the receptacle definition states that a multiple receptacle is two or more devices on the same yoke. You have a point that is a factory assembled unit and it might not make much difference in this case.

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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.

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