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puppymartini

20V AC between slab and electrical ground (lemmy.ca)

submitted 2 weeks ago by [email protected] to c/electricians

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I've just had a new house built in Atlantic Canada. This morning I noticed a bit of a tingle from my coffee machine when I touched it with wet hands. The machine has a grounded (3 pin) plug and I checked - it has 0V between the parts I touched (the entire metal outer case) and the ground socket in the outlet. So, I got curious and did some more measurements. It turns out there is 20V AC (and about 300mV DC) between the ground in my outlets and me when I'm standing on my floor (sealed concrete slab) with bare feet.

I assume this isn't good?

I'll be calling the electrician that wired the house in the morning, but I'd appreciate any insights you might have.

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[–] [email protected] 0 points 2 weeks ago (1 children)

Is it possible that rebar running parallel to a mains power run is inducting current to the slab?

[–] [email protected] 2 points 2 weeks ago

No - the main comes down from above.