Which of the following best describes the minimum receptacle device rating on a 20-amp branch circuit serving multiple receptacles?

• A. 20 A
• B. 25 A
• C. 15 A
• D. 30 A

Answer: (C)

The circuit is a 20-amp branch circuit, and on such a circuit that serves multiple receptacles, the receptacle outlets can be rated for 15 amps or 20 amps. The smallest allowed rating is 15 amps, so the minimum receptacle device rating is 15 A. This matches common 15 A outlets to a circuit protected at 20 A, while still allowing 20 A outlets if desired. Receptacles rated 25 A or 30 A aren’t permitted on a 20 A circuit because the device ratings would exceed the circuit’s protection, which isn’t allowed.