Code Quiz of Day

Back-fed Circuit Breakers in PV Systems

Oct. 22, 2014

Article 690 requirements apply to solar PV systems.

Plug-in type backfed circuit breakers connected to a stand-alone PV system are not required to be secured in place by an additional fastener that requires other than a pull to release the breaker from the panelboard.

a) True
b) False

See answer and applicable Code reference

The correct answer is: b) False

Article 690 requirements apply to solar PV systems. Circuit requirements are outlined in Part II of this Article. As noted in Sec. 690.10(E), "Plug-in type back-fed circuit breakers connected to a stand-alone inverter output in either stand-alone or utility-interactive systems shall be secured in accordance with 408.36(D). Circuit breakers that are marked "line" and "load" shall not be backfed."

About the Author

Mike Holt

Mike Holt is the owner of Mike Holt Enterprises (www.MikeHolt.com), one of the largest electrical publishers in the United States. He earned a master's degree in the Business Administration Program (MBA) from the University of Miami. He earned his reputation as a National Electrical Code (NEC) expert by working his way up through the electrical trade. Formally a construction editor for two different trade publications, Mike started his career as an apprentice electrician and eventually became a master electrician, an electrical inspector, a contractor, and an educator. Mike has taught more than 1,000 classes on 30 different electrical-related subjects — ranging from alarm installations to exam preparation and voltage drop calculations. He continues to produce seminars, videos, books, and online training for the trade as well as contribute monthly Code content to EC&M magazine.