If a 20A branch circuit supplies multiple receptacles, what is the minimum ampere rating required for those receptacles?

The correct answer is 15A because, according to the National Electrical Code (NEC), the standard maximum rating for receptacles on a 20A branch circuit is 15A. This is primarily because receptacles are configured to handle a variety of different devices, and the typical household receptacle is rated for 15A.

Using a 15A receptacle on a 20A circuit ensures that the receptacle can adequately handle the current while providing a level of safety. Even though the circuit can provide up to 20 amps of current, the corresponding receptacles need to be able to handle potential loads safely. Therefore, ensuring a minimum rating of 15A for the receptacles maintains alignment with the NEC guidelines while allowing for flexibility in the types of devices that can be plugged in.

Choosing a higher-rated receptacle, such as 20A, would not be necessary in a typical residential application, as it could lead to potential hazards if loads exceed the safe ratings of the connected devices.