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Witchy
 
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Default switch wiring oddity

Hi folks,

Not been here for ages 'cos of a new job Down South, hence no diy
apart from weekends!

Anyhoo, got an oddity at a mate's house with the bathroom light. The
switch is outside the door and contains 3 cables, one of which looks
like it contains 2 red wires?! 2 blacks are joined in a choc-block,
one red doesn't go anywhere and the other 3 reds are in the switch.

Ceiling rose has 3 sets of cables, one of which goes to another light
which is being removed.

Now the conundrum - with the light OFF there's 240V across the swtich.
Turn the light ON and the voltage vanishes.

Any clues?

cheers

adrian/witchy, now in cambridgeshire.
--
cheers,

witchy/binarydinosaurs