Code Q&A: Sizing Bonding Jumper for Parallel Raceways

May 7, 2015

NEC guidelines for sizing supply side bonding jumpers for parallel raceways

Q. What are the rules for sizing a supply side bonding jumper for parallel raceways?

Find the Answer

A. If the ungrounded supply conductors are paralleled in two or more raceways or cables, you must size the supply-side bonding jumper for each raceway or cable in accordance with Table 250.102(C)(1), based on the size of the largest ungrounded conductor in each raceway or cable [Sec. 250.102(C)(2)].

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.