Re: RCD trip mode question
An RCD can certainly be tripped by a neutral to earth short. I found this out when replacing a light fitting in my shed. The shed is supplied via a 4 sq. mm feed that supplies the 13A sockets, and the lights are run as a fused spur protected by a 5A cartridge fuse. I had removed the 5A fuse before removing the old fitting, and when disconnecting the cable, the neutral momentarily touched the earthed metal housing and the RCD immediately tripped.
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