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I've done electrical wiring in my home country but in Canada I'm not sure why I see 3 "live" wires in the switch. Why is that? I'm not sure how I would replace this with a switch that only takes two wires. It's not a 3 way switch. And it's not the neutral or earth wire (in case someone's wondering)
 

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What does that switch power?
A fan and a light, a ceiling light and a switched outlet?
No way there all hot infeed wires.
How are you testing for power?
If your trying to use a non contact tester it's not going to work.
My guess would be that top wire is your incoming power.
No ground wire in that box?
 

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Very Stable Genius
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The two wires closest to each other (on the right in the pic) are electrically
connected to each other within the switch. I would not do it that way and I
would not use the back stabs (term used for push in connectors on back of
switch of receptacle).
Here's what I'd suggest: Remove those two wires (ones closest to each other)
and twist them together. To these two wires add 6" segment of wire (known as
a tail). Now, with the tail and the wire currently connected at the left of the
pic, you'll have two wires to connect to any single pole switch.
Make sense?

EDIT: BTW, Welcome to Canada!
 

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Very Stable Genius
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4,164 Posts
What does that switch power?
A fan and a light, a ceiling light and a switched outlet?
No way there all hot infeed wires.
How are you testing for power?
If your trying to use a non contact tester it's not going to work.
My guess would be that top wire is your incoming power.
No ground wire in that box?
One of the wires on the right is hot in and and the other is hot out.
Doesn't matter which is which.
The wire on the left is switched hot.
 
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