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

submitted 6 days ago by [email protected] to c/[email protected]

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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] 2 points 6 days ago (1 children)

Oh brother, if you think new construction is good... Bless your heart. A missing or detached earthing is totally possible with the terrible quality of most new homes and the hit or miss nature of home inspections.

I have seen brand new luxury condos that practically need the entire structure rehabed because the builders were so bad. Then there are new detached homes that have envelopes so bad that you can check how many rafters are broken by looking in from the flashing.