I had an extension with a shower/toilet built. Ocassionally, I noticed there is some tingling feeling when I touched the tap or in the water but it's not always there. This convinces me that the earthing is somehow not correct. I have a similar problem with the upstair bath taps too. Both rooms have an electric shower installed. As said, the problem is not there all the time.
Firstly how can I check if there is an electrical earthing problem. I strapped the hot/cold water pipe to provide equi-potential seem to help for awhile but it came back ocassionally again.
Secondly, is the earthing in the shower unit not adequate, hence the problem. How can I check that?
Thirdly, what can I do to ensure the earthing is adequate?
Your advice is always be appreciated.