A friend of mine asked me to look at a fused switch for a water heater (uk domestic 230V) in his kitchen. It was installed by an electrician and he just noticed it was causing a large spark when switching it off. Not when switching it on.
I suggested just changing the switch. To my (limited) electrical knowledge it would either be the switch or the heater is drawing too much current and a new switch is inexpensive. Anyway, the new switch also sparks but only when switching off.
Why does it not spark when switching on and if the heater is drawing too much current then why isn't the MCB tripping? Or is there another reason why this is happening?
Oh, and I advised him to have an electrician look at it so no health and safety concerns here.
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