earth fault

Bought a socket tester, all fine - apart from one! Single socket, earth wire is physically present. But socket tester says no earth. I've replaced the socket with a known good - still nothing. The double sockets either side are all good. There's only the three wires in there, so I assume it's...

Curious about how those on here handle testing RCD's when doing EICR's or MWC's? If you have several circuits protected by an RCD as is often the case, do you test the RCD on each circuit it protects or just once for each RCD what is ideally done with no loads at the distribution board. In...

Just wondering what BS7671 says about fixed sockets being RCD protected when being fed from a portable UPS (i.e. removable rack type UPS) when the the UPS is operating on battery mode and the Line & Neutral conductors are isolated from Earth. (Effectively a Isolated Terra based earthing system.)...