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I’ve just finished replacing a light fitting, as usual I turned off the associated breaker, checked for no voltage with a detector pen, then went ahead with the replacement. However when I touch the earth, the rccb tripped causing the rest of the house’s electric to go off. This can...

We’ve been confused as to why our electric shower sometimes won’t maintain a consistent temperature. Took it apart and there’s a considerable amount of white shell like particles (limescale?!) in both the filter and within the shower hose just before the shower head. After removing the...