Which load value is associated with a 20-amp circuit in NEC 220.52(A) examples?

Which load value is associated with a 20-amp circuit in NEC 220.52(A) examples?

• A. 1,000 VA
• B. 1,500 VA
• C. 2,000 VA
• D. 2,500 VA

Answer: (B)

In this NEC example, dwelling-unit load calculations use standardized design values to simplify sizing feeders and services. For a typical 20-amp branch circuit, the NEC 220.52(A) examples assign a design load of 1,500 VA. This reflects the way small-appliance circuits (like kitchen receptacle circuits) are treated in planning: you assume up to 1,500 VA of load per circuit for calculation purposes, rather than using the actual connected devices. It’s a conservative, consistent figure that helps ensure the service is sized adequately, even though the circuit’s maximum possible current could be higher (a 20-amp circuit at 120 V can carry up to 2,400 VA, but the design load used for calculations is 1,500 VA). The other listed values aren’t the standard design load shown for a 20-amp circuit in these examples.

In this NEC example, dwelling-unit load calculations use standardized design values to simplify sizing feeders and services. For a typical 20-amp branch circuit, the NEC 220.52(A) examples assign a design load of 1,500 VA. This reflects the way small-appliance circuits (like kitchen receptacle circuits) are treated in planning: you assume up to 1,500 VA of load per circuit for calculation purposes, rather than using the actual connected devices. It’s a conservative, consistent figure that helps ensure the service is sized adequately, even though the circuit’s maximum possible current could be higher (a 20-amp circuit at 120 V can carry up to 2,400 VA, but the design load used for calculations is 1,500 VA). The other listed values aren’t the standard design load shown for a 20-amp circuit in these examples.