Asked by friend at work for some help which is an area I don't get involved with much as a maintenance engineer with little domestic experience. He has moved a washing machine into new position and whilst leaning on it, he touched the water pipe and got a small shock. Didn't think much of it until whilst under the sink he touched water pipe again and nothing else, he got bitten again. Suspect he has a bonding issue on the water but he says it has an earth cable on it. How would you advise going about fault finding this as it must be a common problem. I do have access to test equipment at work, but would like some advise on what to check first.
Many thanks
Many thanks