ICC Residential Electrical Inspectors Practice Exam

When installing a 20-amp branch circuit supplying two or more receptacle outlets, what is the minimum rating for the receptacle devices?

1. 10 AMP

2. 15 AMP

3. 20 AMP

4. 25 AMP

The correct answer is: 15 AMP

When installing a 20-amp branch circuit that supplies two or more receptacle outlets within a residential setting, the minimum rating for the receptacle devices must be at least 15 amps. This is due to the National Electrical Code (NEC) guidelines, which specify that receptacles on a 20-amp circuit must be rated for a minimum of 15 amps. While 20-amp receptacles are available and can be used in specific applications, the use of 15-amp rated receptacles is permissible on a 20-amp circuit as long as they are installed correctly, meaning that the circuit is designed to handle the total load without exceeding the rating of any individual component, particularly the receptacles. By allowing 15-amp receptacles on a 20-amp circuit, the code accommodates standard equipment and appliances that commonly draw lower current, ensuring broader compatibility while still adhering to safety standards. Therefore, the selection of a 15-amp receptacle for use within a 20-amp circuit remains compliant, maximizing the utility of the electrical system without compromising safety.