Code Q&A: Overcurrent Devices

Aug. 23, 2012
Your most pressing National Electrical Code (NEC) questions answered

Q. When are overcurrent devices restricted from being installed?

A. These are the four key requirements you must keep in mind when installing overcurrent devices.

1) Overcurrent devices must not be exposed to physical damage [240.24(C)]. Note: Electrical equipment must be suitable for the environment, and consideration must be given to the presence of corrosive gases, fumes, vapors, liquids, or chemicals that have a deteriorating effect on conductors or equipment [110.11].

2) Overcurrent devices must not be located near easily ignitable material, such as in clothes closets [240.24(D)].

3) Overcurrent devices aren't permitted to be located in the bathrooms of dwelling units, dormitories, or guest rooms or guest suites of hotels or motels [240.24(E)]. In addition, the service disconnecting means must not be located in a bathroom, even in commercial or industrial facilities [230.70(A)(2)].

4) Overcurrent devices must not be located over the steps of a stairway [240.24(FC)]. Clearly, it’s difficult for electricians to safely work on electrical equipment that’s located on uneven surfaces such as over stairways.

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.

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