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Code Q&A

Jun 5, 2008 1:23 PM, By Mike Holt

Q. I have a building that has two services from the utility. Do I have to use the same grounding system for both?

A. Yes [250.58]. A concrete-encased electrode can be used as a common electrode [250.52(3)] for multiple services. The metal frame of a building connected to earth [250.52(A)(2)] is another method used to connect multiple services to a common electrode.

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