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Hello Guy, thank you for your kind words and participating in the CQD. Guidance on this can be found in the definition of Selective Coordination found in Article 100 of the NEC®. Selective Coordination is achieved by choosing OCPDs that will restrict outages for the full range of available fault currents and the full range of OCPD clearing/opening times. There is no specific clearing time specified in the NEC® for emergency systems, meaning the OCPDs will need to be Selectively Coordinated for the full range of clearing times.
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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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