National Electrical Installation Standards

Standards as High as Your Own

Monday, August 19, 2019


The question I'm asking would be under the 2017 NEC. It concerns charging cables from a level 3 electric vehicle charger. They operate at 150 to 850 volt with a maximum output current of 600 amp DC per specifications. They ran several hundred feet to vehicle dispensing units from the main charger. It does look like there is any protection on the conductors from the charger. How does the code address this?

Greg Evers


Hey Greg thanks for your question. Electric Vehicle Supply Equipment is required to be listed as stated in 625.5 so the requirements in the product standard address the protection of the conductors. Informational Note 2 to the definition of Electric Vehicle Supply Equipment in 625.2 states that the terms electric vehicle supply equipment and electric vehicle charging system equipment are considered to be equivalent.

ABOUT CQD: NECA’s Code Question of the Day (CQD) is a leading National Electrical Code® forum for NECA and the industry. The CQD generates a lively dialogue and relative practical and Code-based responses to an ever-increasing and interactive audience.

IMPORTANT NOTICE: All answers are based on the latest edition of the National Electrical Code®, unless the question requests a response based on a specific edition. This correspondence is not a formal interpretation of the NEC®. Any responses expressed to the questions are opinions and do not necessarily represent the official position of NECA, NFPA, or any technical committee. In addition, this correspondence is neither intended, nor should it be relied upon, to provide professional consultation or services.

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.

NECA STANDARDS: NECA publishes the National Electrical Installation Standards™ (NEIS™), a series of ANSI-approved performance and quality standards for electrical construction. Visit for more information. NEISÔ can be purchased in three formats: as paper books, on CD, or as electronic downloads.

NECA SAFETY PRODUCTS: NECA publishes valuable electrical safety books and CDs for the industry. Visit to view or purchase NECA safety products.

 CONTACT US: To submit a Code question, subscribe, or unsubscribe from this list, please e-mail: