Does subpanel require its own surge arrestor?


Old 05-08-20, 06:47 AM
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Does subpanel require its own surge arrestor?

We have a 200 amp service with a large GE panel and a smaller Murray subpanel next to it. The GE panel has a surge arrestor already installed directly below the main 200 amp breaker. Is the Murray subpanel already protected since it is wired to the GE panel? Or, would it be prudent to place one in that subpanel too? Thanks.

Last edited by Dave4242; 05-08-20 at 07:07 AM. Reason: more info
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Old 05-08-20, 08:12 AM
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Necessary? No. Can it help? Yes. A large surge event causes large currents. The more paths available inside the TVSS devices, the less the overvoltage event. More ground rods, and the like, is also important.
Old 05-08-20, 11:02 AM
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Personally, I wouldn't bother with the panels next to each other. If the subpanel was across the house or in a utility building, I think a separate protector would be useful.

(As Telecom Guy stated though, more is always better)
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