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done all of the above but to no avail. tested across pins 1 and 4 of the rcd for resistance with test button pushed - no reading. rcd's knackered. bought and fitted different manufacturer rcbo, job done.

the neutral line from the bottom of the rcd to the bus was pre wired in the unit as was the live bus connecting the mcb to the rcd.

Ok. I'll try to get a photograph up.

need a little help please. I've just changed out a plug in fuse for a shower cu (63a rcd 50 a mcd). Connected correctly, shower powers up ok but when i push test button the rcd doesn't trip. At first I thought faulty rcd so I got a replacement of the same model. Connected up and the same...