ICC Residential Electrical Inspectors Practice Exam

What is the minimum rated duplex receptacle permitted to be connected to a 20 amp branch circuit supplying more than 2 duplex receptacles?

1. 15 amp

2. 20 amp

3. 30 amp

4. 40 amp

The correct answer is: 20 amp

A duplex receptacle connected to a 20 amp branch circuit that supplies more than two receptacles must have a minimum rating of 20 amps. This is in accordance with the National Electrical Code (NEC), which requires that receptacles installed on a 20 amp circuit be rated for at least 20 amps to ensure they can safely handle the potential maximum load of the circuit without risk of overheating or failure. When the circuit is designed to handle 20 amps, the receptacles must be capable of handling the same amount of current flow. Using a receptacle with a lower rating, such as 15 amps, would not comply with safety standards, as it could lead to a risk of equipment damage or fire if a device requiring 20 amps were plugged in. Therefore, the specified requirement guarantees that the entire circuit operates safely within its designed parameters.