The messenger of messenger-supported wiring shall be supported at dead ends and at intermediate locations so as to eliminate _____ on the circuit conductors.
a) static
b) magnetism
c) tension
d) induction
See answer and applicable Code reference
The correct answer is: c) tension
Article 396 covers the use, installation, and construction specifications for messenger-supported wiring. As per 396.30(A), "The messenger shall be supported at dead ends and at intermediate locations so as to eliminate tension on the conductors. The conductors shall not be permitted to come in contact with the messenger supports or any structural members, walls, or pipes."
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.