Code Quiz of Day

Exposed Open Wiring on Insulator Systems

March 9, 2015

Article 398 covers the use, installation, and construction specifications of open wiring on insulators.

Open wiring on insulators within _____ ft from the floor shall be considered exposed to physical damage.

a) 2
b) 4
c) 7
d) 8

See answer and applicable Code reference

The correct answer is: c) 7

Article 398 covers the use, installation, and construction specifications of open wiring on insulators. Where this type of wiring is exposed to physical damage, Sec. 398.15(C) notes: "Conductors within 7 ft from the floor shall be considered exposed to physical damage."

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.