National Electrical Installation Standards

Standards as High as Your Own

Friday, May 4, 2018


Re: CQD answer published Thursday, April 26, 2018 -Field Labeling

Charlie, in the answer you gave to the CQD for April 26 you mentioned field labeling. What is that?

Thank You, Kaylea



Hey Kaylea thanks for your question. Field Labeled and Field Evaluation Body are two new definitions that were added in the 2017 NEC. Some testing laboratories offer a service (FEB)to evaluate equipment or materials in the field (on site) and issue a report. If the evaluation determines the equipment or material meets the requirements of applicable codes and standards a Field Label is attached. The AHJ can then use this to help with their approval of equipment or an installation. The definitions are new to the NEC but the process has been available for quite a while. More information is available at for NFPA 790, Standard for Competency of Third-Party Field Evaluation Bodies and NFPA 791, Recommended Practice and Procedures for Unlabeled Electrical Equipment Evaluation.

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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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