I have exhaust fan and has no plug and the exhaust fan wire is too short, so I bought more wire but it's bigger than the existing wire. I'm planning to connect it to the light switch. Is this safe?

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    Welcome to Home Improvement. It may be best to include a couple of pictures of your fan and some more details. You say "exhaust fan", and I think a bathroom or stove exhaust fan that's hard wired into the house wiring, but then you indicate that there's no plug, as though the plug has been cut off. Please clarify which situation. For in-wall wiring, so long as you're using the correct type of wire, you can go to a bigger size (for example, you can use 12 AWG wire in a 15amp circuit where normally one would use 14AWG. Again, please edit your post to include some pics. – FreeMan Jul 13 at 17:37
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    Can you post photos of the existing fan and its wiring please? – ThreePhaseEel Jul 13 at 17:46
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    Generally speaking, it's fine to use a slightly larger wire size. It's not fine to use smaller. For a more definitive answer, please respond to the comments above. Also try to find your period key for next time. :) – isherwood Jul 13 at 19:14
  • I agree with Isherwood as long as the box fill is not exceeded and all connections are made in boxes larger wire is ok. Well the wire has to be rated for the location also. – Ed Beal Jul 14 at 22:03

You can freely mix wire gauges as long as the smallest (the existing wire, in your case) is thick enough to be safe.

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