Code Quiz of Day

LFMC Wiring Methods

Feb. 20, 2015

Where LFMC is used in a Class II, Division 1 location as permitted in 502.10, it shall ______.

a) not be unsupported
b) not exceed 6 ft in length
c) include an equipment bonding jumper of the wire type
d) be Listed for use in Class I locations

See answer and applicable Code reference

The correct answer is: c) include an equipment bonding jumper of the wire type

Article 502 covers the requirements for electrical and electronic equipment and wiring for all voltages in Class II, Division 1 and 2 locations where fire or explosion hazards may exist due to combustible dust. As noted in Sec. 502.30(B), "Liquidtight flexible metal conduit shall include an equipment bonding jumper of the wire type in compliance with 250.102."

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.