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I have read that you can have redundant surge protectors (one on a main panel, another on a sub panel), but I'm not sure it's worth the cost (~$100). An HVAC contractor thought I needed one on the workshop sub panel to protect the delicate minisplit electronics even though I have one on the main panel.

I will have relatively powerful equipment on the sub panel (220V table saw, jointer/planer) if that is a factor for protecting from equipment-generated surges.

If so, I just install it further upstream immediately next to the shut off on the sub panel, just like the main panel, right?

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  • If it's truly "redundant" you don't need it. More "additional" or "supplementary" than "redundant" as described. Where is the workshop sub-panel with respect to the main panel that has one already?
    – Ecnerwal
    Commented Jul 7 at 11:40
  • The sub-panel workshop is on a separate structure about 75 feet away, and the cable connection is in-ground in conduit. Both panels are installed on exterior walls.
    – jtolman
    Commented Jul 7 at 12:17
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    Then (separate structure, outside cable run) you definitely want a surge protector there, IMHO.
    – Ecnerwal
    Commented Jul 7 at 12:47

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You install a whole panel surge protector the same way in a subpanel as you do in the main panel. I spot checked a few sets of instructions just to make sure I wasn't forgetting anything, and yep, the instructions for subpanels are the same.

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