Twist on 15A recep on 20A circuit ?
Duplex receptacles, whether 15 or 20 amp, will pass through 20 amps for daisy chaining purposes.
The rating has to do with the contact blades inside the slots, also a "20 amp" plug is shaped differently from a "15 amp" plug.
You should not find a 20 amp appliance with a 15 amp plug on it but a general purpose light or appliance under normal or slightly abnormal use has to be safe on a 20 amp circuit in order to pass typical rating standards such as from Underwiters' Laboratories.
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Last edited by AllanJ; 01-10-2013 at 12:06 PM.