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12 and 14 gauge wire on one circuit

27808 Views 4 Replies 4 Participants Last post by  whatrymes

We have a 20 amp dedicated circuit upstairs that only serves a small A/C unit (4.2 amps) and is really overkill. The cable is in a perfect location for me to tap into for an outside motion light and switch. I really prefer using #14 cable for several reasons.

Is it OK to splice into this #12 cable provided of course I switch out the breaker to a 15 amp breaker?

Thank you
1 - 1 of 5 Posts
I agree with the previous poster. Just use 12 gauge wire and you won't need to worry. It isn't recommended to connect 14 to 12 as 14 wire isn't meant for 20 amp breaker. Its max load is 15 amps.
1 - 1 of 5 Posts
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