What is the minimum size in volt-amperes that a dryer must be calculated at when sizing a service?

The minimum size in volt-amperes that a dryer must be calculated at when sizing a service is 5,000 volt-amperes. This value is based on the National Electrical Code (NEC), which establishes guidelines for the proper sizing of electrical services and equipment.

According to NEC rules, a standard electric clothes dryer typically requires a minimum load calculation to ensure that the electrical system can handle its operational demands safely. The 5,000 volt-amperes is determined as it provides a safe margin that includes not only the operational wattage of the dryer but also accounts for potential surges in energy use during various phases of the drying process.

Using this figure ensures that circuit breakers and wiring are appropriately rated, preventing overloads and enhancing safety. This number also helps in adjusting the overall capacity of the service to accommodate the cumulative demand of all connected loads, which is critical in residential and commercial settings where multiple appliances may be in operation simultaneously.