If you're talking about the bathroom, as I said, mine does not have all-plastic plumbing. However, 'safe' is obviously relative, and I certainly regard my house (all of it) as 'safe enough', in that all extraneous-c-ps are bonded and all exposed-c-ps earthedIn that case your house is safe without any special mitigation measures.
As you know, that's essentially what I told him. I don't think it's quite as simple as just that 'thin layer of water' since, as I told him, water rapidly penetrates the outer layers of skin and considerably reduces the skin resistance, even if there is no 'overt' layer of water.According to the poster's question it was why does the water pose a danger in the bathroom if it's not very conductive. The answer is the water is a thin layer between the person skin and the metallic parts.
Take away all the metallic parts, and there is no need for anythingTake either of those away and the need for mitigation is lower.
That's what we all say, and it's obviously true in some senses. However, I hope it doesn't make people forget that, even in the total absence of water/humidity/moisture, 230V sending current through one's body (including very dry skin) for a significant period of time is very likely to kill.Or put it another way, water and electricity don't mix.
Kind Regards, John