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Old September 22nd 06, 12:03 AM posted to uk.d-i-y
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First recorded activity by DIYBanter: Jul 2006
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Default Voltage earthing through dishwasher casing/door

Cordless Crazy wrote:

Found out earlier that when I plug my new Bosch dishwasher into a short
extention lead (one without and earth wire for some reason (after
investigating)) there is some residual voltage running through the
casing/metal door lining. Upon touching the door I got a small shock
(bit like and electric fence).

Checked it out and it seems to be of the figure of 50v running between
the door and the floor i.e. with me acting as an earth!!

Bit more than I expected for residual voltage, as you would get with
most appliances.

Once plugged in to the normal ring main and not with the crappy ext
lead (that which is now confined to the shed as spare parts) the
residual voltage reading drops to zero (as expected) as the integral
earth wire is taking it away.

My question is: does this sound right or is the appliance faulty?

The voltage measured is as much a function of the meter as the
appliance, so 50v doesnt tell us much. But a shock form it means its
leaking more than it should, so yes somethings wrong. Earthed leaky
fixed appliances are commonish and dont seem to contribute to the death
figures, even though one would imagine them to be a risk.