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Old 08-07-2019, 03:49 PM   #1
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Default Surge protection Location

Hi y’all,
I’m wondering if anyone has any input on where is the best place for surge protection in this situation:

Residence with a 400 amp service; consists of 400 Amp fused main disconnect, CT cabinet, and a 400 amp splitter with 2 x 200 amp panels and a hot tub disconnect coming off it.

One sales rep said I need to protect both 200 amp panels and another told me I could go right off the switch or lugs in the splitter. I guess doing it everywhere would be be$t!

I’ve always thought it best to protect as far upstream as possible, but the one guy said I need to protect each panel from surges or transients imposed by loads (motors?)fed from the panel that could affect other loads in the same panel. Makes sense, but I always thought it was surges coming in that were the most damaging.

I’m interested to know what some of you who have more experience would recommend in this situation. Also if you have a preferred product maybe you could pass that information along. Thanks in advance guys!



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Old 08-07-2019, 04:33 PM   #2
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NEMA has done extensive research on it and they say there are 3 places to protect anything. Service, MDP & as close as possible to the thing being protected.

Read all about it at https://www.nemasurge.org/
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Old 08-07-2019, 08:50 PM   #3
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It's counter-intuitive, but most surge protection devices work better the CLOSER they are to the equipment they protect. It has to do with the impedence in the wire. (Evidently bigger wires with lower impedance also helps.)

Put surge protection on every panel and add point of use protection (usually surge strips) for the sensitive loads, and make sure your grounding is good.
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Old 08-08-2019, 12:20 AM   #4
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This is a case where more is better. I don't think there's any such thing as too much surge protection, but, it should be monitored. Nothing worse than thinking you're protected, when your MOV's are blown out from the last strike.
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Old 08-10-2019, 01:17 AM   #5
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Thanks!


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