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Re: CQD answers published January 3, & 12, 2018 -Single Receptacle Rating & Range Circuit 2
Charlie, one of the reasons that we need 210.21(B)(1) to state that a single receptacle shall not have a rating of less than that of the branch circuit is for electric ranges. The range receptacle is rated at 50 amps, but many ranges only require a 40 amp branch circuit. Without this rule, we would have to install 50 amp branch circuits for all electric ranges.
Hey Don thanks for your comment you have a good point. We received some other comments about sizing branch circuit conductors for a single range that was published on Tuesday January 2, 2018. A proposal (2-333 on page 355 of the ROP) to delete the first sentence of Note 4 in Table 220.55 (Table 220.19 then) for the 2005 NEC was rejected by Code making Panel 2. The submitter stated that this is the only place in the NEC where a demand factor can be applied to a branch circuit and it should be deleted. The panel's response was that the submitter had not provided substantiation to show the present method was inadequate.
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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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