I took of the cover of a fixed fused spur (switched off and fuse removed) just to take a look at the wiring behind and then whilst screwing back the front plate it tripped the RCD on the consumer unit and I lost the whle power ring. With all the domestic appliances unplugged I still couldn't get the RCD to switch back on; I removed the front plate again, all the wires were tight but no joy; then after removing the front plate around 3 times further the RCD started to function again. I didn't touch any wiring in fused switch yet something caused it to trip whilst just putting the front plate back on. Any ideas 
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