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Im sorry I am still talking about this.. so despite my breaker for a bedroom listing '15', I can still install the 20 amp outlet ? Thats basically where I am confused I just am thinking to myself, 20 is higher than the listed 15.. thinking it will cause some sort of problem.You are overthinking this. You don't need to worry about functionality in either case. The only concern is if you want to maintain your house up to electrical code. The odds of you trying to plug in an appliance that draws more than 15 amps into that receptacle are very slim. That would be the only safety concern.
Normally, kitchens and laundry rooms use 20A breakers. Bedrooms and other living areas typically use 15A breakers. If the outlet is fed from a 20A breaker then it would be fine per the code to install either a 15A or 20A receptacle.
Why the difference? The code limits permanently installed devices to 80% of the outlets rated load. Some refrigerators, microwaves, coffee makers, and clothes dryers pull more current than the 12A limit for fixed devices on a 15A circuit. Using a 20A rated circuit allows up to 16A of fixed load. And yes.. I know... it is just an oddity in the code where you can have portable space heater that draws 14A on a 15A circuit but if the heater were fixed (which should be safer) it is not allowed.
So why not just use 20A breakers everywhere? A 20A breaker requires at least 12AWG wire. A 15A breaker allows you to use 14AWG wire which is smaller, and therefore cheaper. And that is really the only reason since it is perfectly acceptable to use a 15A receptacle on a 20A breaker as long as there is more than 1 receptacle fed from the breaker. It's strictly a way for electricians to save money when wiring houses.