overcrowded terminal

What’s Wrong Here? Hint: Overcrowded Terminals

Sept. 22, 2022
Think you know how this installation violates the NEC?

Hint: Overcrowded terminals

I counted six equipment grounding conductors (EGCs) and bonding jumpers jammed into this lug designed for only two conductors. Jamming six conductors into terminals designed for no more than two conductors is a violation of Sec. 110.14(A). Terminals for more than one conductor must be identified for such use. Using equipment in ways that contradict the listing or labeling instructions is a violation of Sec. 110.3(B). On a positive note, the installer did take the time to remove the paint from the enclosure where the lug was bolted on. This was a great job in complying with Sec. 250.12, which requires nonconductive coatings like paint, lacquer, and enamel to be removed from contact surfaces to ensure good electrical continuity. As for the orange tape installed on the green wires, there are no Code rules prohibiting the use of marking tape on EGCs or bonding jumpers. Section 250.119 requires insulated or individually covered EGCs to have a continuous outer finish that is either green or green with yellow stripes. In this case, the continuous green outer finish has orange marking tape installed over it. I don’t see any real-world problems here.

About the Author

Russ LeBlanc | Owner

Russ started in the electrical trade as an apprentice in 1985. He worked his way up to become a Journeyman Electrician and then eventually became a Master Electrician and Licensed Construction Supervisor. In 1999 Russ become an Electrical Instructor for The Peterson School of Engineering in Massachusetts where he developed his passion for teaching, and quickly became Department Head of Electrical Instruction. Russ has taught thousands of apprentices, electricians, engineers, inspectors, and other electrical professionals during his career as an instructor. He continues to provide electrical professionals with Electrical Code seminars, Arc-Flash Awareness training seminars and educational material through his LeBlanc Consulting Services in North Reading, MA whose specialty is educating electricians. He has been an active member of the NFPA Electrical Section and has authored hundreds of National Electrical Code proposals and comments which have become Code rules to improve the safety for the electrical industry. Russ is also an IAEI certified Electrical Inspector.

Please visit www.russleblanc.net for more information.

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