OK. I have some info.
The Leviton 51120-1 panel protector has a $25,000 warranty protecting electronics downstream of the device. It should be installed on MAIN panel, though it could be installed on a sub-panel, if your sub-panel is in a weather protected location. If you pump (or other house devices) are damaged by a surge, the 51120-1 will fail, and should indicate failure on the front of the panel. You have to remove the panel (maybe, just the interior guts) and send it to Leviton for inspection. If they validate a panel destroying surge, they will then cover some part of the your repair expenses. However, what will happen more often is that a surge will destroy the panel, but nothing else. However, it's better to replace a $200 panel than $800 of pump electronics.
I'm going to be talking to a Leviton engineer in the AM (rather than a applications specialist) to find out what might be needed to resolve the ground loop problem.
Here are the links:Leviton 51120-1 panel protect product pagea couple of links for later:
Leviton 51120-1 Panel Protector, 120/240-Volt @ Amazon (~$180)
http://www.pentairpool.com/partslist...compool-33.htm
http://www.amazon.com/Pentair-AI101-.../dp/B008GTWK4Q
I'll post the warranty, below.
Oops! In parsing the warranty, I discovered that pool pumps are probably excluded. I talked to Leviton again, and the support tech agrees that there are some inconsistencies in the literature. He's going to ask the product manager to call me, so hopefully I'll know more in a day or two.
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