Code Quiz of Day

Guarding of Moving Parts

May 1, 2015

Parts I through VII of Art. 240 provide the general requirements for overcurrent protection and overcurrent protective devices rated less than 1,000V.

Mike Holt

Handles or levers of circuit breakers, and similar parts that may move suddenly in such a way that persons in the vicinity are likely to be injured by being struck by them, shall be _____.

a) guarded
b) isolated
c) a and b
d) a or b

See answer and applicable Code reference

The correct answer is: d) a or b

Parts I through VII of Art. 240 provide the general requirements for overcurrent protection and overcurrent protective devices rated less than 1,000V. Disconnecting and guarding rules are outlined in Part IV. As noted in Sec. 240.41(B), "Handles or levers of circuit breakers, and similar parts that may move suddenly in such a way that persons in the vicinity are likely to be injured by being struck by them, shall be guarded or isolated."

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.