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Tuesday, January 30, 2018

Question:

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.

Don Ganiere

A

Answer:

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.

ABOUT CQD: The Code Question of the Day (CQD) is NECA and ELECTRICAL CONTRACTOR Magazine’s flagship National Electrical Code (NEC®) public forum for the industry, sponsored by EATON. The daily distribution of Q&A generates a lively dialogue and shares relative Code-based practical responses.

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CHARLIE TROUT: 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. Even though Charlie passed away in October of 2015, his work continues in spirit. NECA continues to maintain this question forum for its many subscribers in memory and recognition of all his significant contributions to making the NEC what it is today.

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IMPORTANT NOTICE: Unless the question requests a response based on a specific edition, all answers are based on the latest edition of NFPA 70® National Electrical Code®.

This correspondence is not a formal interpretation of the NEC® and any responses expressed to the questions are opinions and do not necessarily represent the official position of NECA, NFPA, the NEC Correlating Committee any Code-making panel or other electrical technical committee. In addition, this correspondence is neither intended, nor should it be relied upon, to provide professional consultation or services. 

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