Bonding jumpers for service raceways shall be used around impaired connections such as ______.
a) oversized concentric knockouts
b) oversized eccentric knockouts
c) reducing washers
d) any of the above
See answer and applicable Code reference
The correct answer is: d) any of the above
Article 250 covers the general requirements for grounding and bonding. Bonding requirements are specifically outlined in Part V of this Article. As per the first sentence of Sec. 250.92(B), "Bonding jumpers meeting the requirements of this Article shall be used around impaired connections, such as reducing washers or oversized, concentric, or eccentric knockouts."
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.