In my apartment we just got a new kitchen, and five minutes after the electrician left, i got a shock by touching the sink and the dishwasher et the same time. I got my multimeter and measuered the voltage difference between the two. I Measured it at 150 V AC.
The dishwasher and the oven is standing right next to each other, so i also measuered the voltage between the sink and the oven: 7 V AC. So pretty much no voltage across. Now, my lacking logic tells me that there must be a large voltage difference between my oven and my dishwasher. Atleast 143 V is my guess.
The thing is that there is not a large voltage differnce between the oven and dishwasher, but only a difference of 3 V.
How can this be? Should there not be a large difference if the oven and the sink have a close potential, and the sink and dishwasher have a a large voltage difference?
Needless to say, i have no ground in my appartment.
Can anyone enlighten me?
Best Answer
My guess is there used to be a ground strap to the previous plumbing that was not replaced when the new, no doubt plastic, pipe was installed with the new sink.
Having said that, there must be a ground fault in one or the other.
Turn OFF the breaker to the stove and dishwasher and call an electrician ASAP.