National Electrical Installation Standards

Standards as High as Your Own

Tuesday, December 26, 2023


Good morning CQD, in the 2023 edition of the NEC® the informational note Figure to Section 700.32(C) states that OCPD-B is not required to selectively coordinate with OCPD-A because OCPD-B is not an emergency system OCPD. Doesn't new section 240.11 require OCPD-B to be selectively coordinated with the service OCPD-A? All the best, William G


Hi William, great question. In the Informational Note/Figure to 700.32, OCPD-B would not be required to be selectively coordinated with OCPD-A. OCPD-B does not require selective coordination as it is not an emergency system requiring selective coordination by Section 700.32, as such Section 240.11 does not apply. The purpose of selectively coordinating OCPDs is to achieve a higher level of reliability by localizing outages. In the one-line diagram in the Figure provided in Section 700.32, if either one or both of OCPD-A or OCPD-B trips, the result in outage would be the same.

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.

SUBMIT YOUR CODE QUESTION: Click here to submit a question to for inclusion in an upcoming edition of the Code Question of the Day, or email

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.

NECA STANDARDS: NECA publishes the National Electrical Installation Standards™ (NEIS™), a series of ANSI-approved performance and quality standards for electrical construction. NEIS can be purchased in the NECA Store in three formats: a printed or  PDF download of a standard or, as an  annual subscription service.

NECA SAFETY PRODUCTS & PUBLICATIONS: NECA produces electrical safety publications and products for the industry including jobsite safety guides, handbooks and resource kits. View a full listing of available resources and products »

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. 

UPDATE YOUR SUBSCRIPTION PREFERENCES: Subscribe or Unsubscribe from this list.