Code Q&A

Q. What’s the maximum number of circuit breakers permitted to be installed in a panel? A. The maximum number of circuit breakers permitted in a panelboard is limited by the instructions posted inside the panelboard . In addition, 408.15 specifies that a ...

Mike Holt

April 8, 2005

Q. What’s the maximum number of circuit breakers permitted to be installed in a panel?

A. The maximum number of circuit breakers permitted in a panelboard is limited by the instructions posted inside the panelboard [110.3(B)]. In addition, 408.15 specifies that a lighting and appliance panelboard, as defined in 408.14(A), isn’t permitted to have more than 42 overcurrent devices installed in any one cabinet.

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.