The VA per duplex receptacle is the same regardless of whether the circuit is 15A or 20A. The National Electrical Code (NEC) uses the following rule for general-use receptacles: NEC 220.14(I)

For receptacle outlets, each single or multiple receptacle on one strap shall be calculated at not less than 180 VA.

Therefore, a duplex receptacle is always calculated at 180 VA, whether it's on a 15A or 20A circuit.Why is it the same? Diversity

The NEC assumes that not every receptacle on a circuit will be loaded to its full capacity simultaneously. The 180 VA figure is an average demand factor.

Code Minimum

This is a minimum calculation for load estimating. It doesn't prevent you from using a larger value if you know a particular receptacle will have a higher load.

Not Capacity Rating

The 180 VA is not based on the receptacle's current capacity (15A or 20A).

Important Considerations This rule applies to general-use receptacles. Dedicated circuits for specific appliances (e.g., a refrigerator) must be calculated based on the actual appliance load. For continuous loads (loads that operate for 3 hours or more), you need to apply a demand factor of 125% to the circuit's overcurrent protection.* Always refer to your local electrical code and consult with a qualified electrician for specific requirements in your area.

In summary, use 180 VA per duplex (or single) receptacle for load calculations regardless of the circuit ampacity (15A or 20A). Flag for review