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1955 Dodge Coronet. Tell me this isn't sweet!
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It can be easy to get confused with so many statements being made. To avoid confusion:
* If you have 14 gauge wire it must have a 15 amp breaker
* If you have 12 gauge wire it must have a 20 amp breaker. No, it's wrong to put a 15 amp breaker on 12 gauge wire. Yes, it's technically safe as the wire is "overbuilt", but it can cause confusion and problems in the future. Just do it right.
* a 12 gauge circuit protected by a 20 amp breaker should ideally have 20 amp receptacles. It MUST have a 20 amp receptacle if only one is being installed. As shown above, you MAY use 15 amp receptacles if there are multiple.

@Charles Cook
So bottom line is your garage with a 12Amp breaker, 12/2 wire and mixed 20 and 15 gauge receptacles is fine.
Here’s where a major problem can happen. A lot of people use the receptacle as a junction point. I’ve seen outlets melt, when that is done with a 15 Amp outlet. If you’re going to use 15Amp outlets, connect the wires together, with a pigtail for that particular outlet. To me, saving a buck or 2 per outlet isn’t worth it. Take care, and be safe out there.
 
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