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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.