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Hadn’t thought of the continuity test on the machine, would be good to confirm that it’s not a fault with the grinder.
I did send them a link to a socket tester but I had a sparky in the shop yesterday and he said that they will pick up the faintest earth connection and test good even if it’s sketchy.
The customer has an electrician coming out today, I hope he finds something but I think it’s the same guy that did their installation so…
Stevethecoffee-
Yeah, you need one of the fancier ones that will do an earth fault loop test ideally, as that will actually check the resistance rather than just continuity.
https://www.pat-testers.co.uk/products/kewtech-loopcheck-107-socket-tester
Nef
I’d do some continuity tests with a multimeter. See if you get continuity between the exposed metal parts of the grinder and the top pin of the plug.
The next step would be to use a simple socket tester on the socket to prove it has an earth.
Does seem weird that static would build at up her shop and not at yours.