Insulation of Batteries

Feb. 5, 2015
The provisions of Art. 480 apply to all stationary installations of batteries.

A vented alkaline-type battery, as it relates to storage batteries, operating at not more than 250V shall be installed with not more than _____ cells in the series circuit of any one tray.

a) 10
b) 12
c) 18
d) 20

See answer and applicable Code reference

The correct answer is: d) 20

The provisions of Art. 480 apply to all stationary installations of batteries. As per Sec. 480.7(B) [Vented Alkaline-Type Batteries], "Cells with covers sealed to containers of non-conductive, heat-resistant material shall require no additional insulation support. Cells in containers of conductive material shall be installed in trays of non-conductive material with not more than 20 cells (24 volts, nominal) in the series circuit in any one tray."

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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