If a 20A branch circuit supplies multiple 125V receptacles, what must be the minimum ampere rating for the receptacles?

The minimum ampere rating for the receptacles connected to a 20A branch circuit must be at least 15 amperes. This is based on the NEC requirements for receptacles on branch circuits.

A 20A circuit allows for receptacles that are rated for 15A or 20A. However, receptacles must have a rating that can safely handle the load without exceeding the capabilities of the circuit itself. Since a 20A branch circuit is generally designed to accommodate expected loads, having 15A receptacles ensures they can be used without the risk of overheating or tripping the circuit under normal operation.

Using receptacles rated at 10A or lower is not permissible because they would not support the circuit effectively, introducing a safety hazard. Additionally, selecting a receptacle rated higher than 20A (like 25A) is not necessary for standard residential applications and would not comply with the intended use of the circuit.

Thus, the correct choice reflects the minimum rating standard to ensure both functionality and safety on a 20A branch circuit.