ECN Forum Forums General Topics of the Trade Non-US Electrical Systems & Trades UK cooker/RCD problem

Yep, a low-voltage ohmmeter test will not always reveal problems that a high-voltage test will show up.

I had an outdoor pond pump like that recently in which damp had gotten in via a crude splice. A low-voltage ohmmeter test showed resistance over 20 meg, yet putting it on a 500V megger revealed the problem instantly.