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The water pipes are earth bonded at the sink, basin & bath, radiators, etc, so that if lightening strikes the house or there's an electrical surge or faulty wiring, the charge is dissipated through the earth continuity, sometimes back to the gas meter and gas pipes or through earth tags or to...

I changed a one way switch to a dimmer - no probs; but when I changed the lounge pendent to a 4 x 50w spots - the dimmer was killed. The set up is: Dimmer - one way - 2 reds only 400w load (250w for GU10 spots) Ceiling Rose 1 red, 2 blacks, 3 yellow/greens Existing pendent L, N, E (L...