Hello probably a very silly question but, still need an advice from a spark ! Thanks in advanced. Today I was changing a socket. The MCB was turned down beforehand and the RCD tripped when Neutral shorted with earth. I suppose this is the correct behaviour but I also shorted Live and earth and RCD did not trip. Only tripped when N + E Is that normal or should not be the case? Again, I’m sorry if this is a very basic one
Yes. While MCB was off. RCD tripped only when Neutral was shorted with earth but it did not trip when live was shorted with earth. Thanks for confirming this is the expected. Cheers
Completely normal. The rcd didn't trip when you shorted L-E because the mcb was turned off. The neutral remains connected when the mcb is off hence the different response.