How to Calculate Full Load Amperage

Full load amperage is important to know when installing new appliances.

Certain appliances, such as refrigerators and air conditioners, require the calculation of what is known as full load amperage. One calculation is for the amperage use during their low-power phase, such as when the refrigerator is only running its fan, and another calculation for amperage use when mechanical implements are initialized, such as when the compressor turns on to begin the refrigeration cycle. The second calculation is larger than the first by a significant amount and signifies the full load amperage. This is important to know when installing an appliance on a circuit.

Difficulty: Moderately Easy

Instructions

1. Step1

   Locate the electrical information label on the appliance. This is a metal stamp permanently affixed to the body of the appliance. In some instances the information is embossed directly onto the surface of the appliance. This label contains all electrical information for the appliance.

2. Step2

   Locate the wattage usage information. If there is more than one number use the largest.

3. Step3

   Ascertain the voltage requirements of the appliance. This information is also available on the electrical information stamp.

4. Step4

   Divide the wattage by the voltage. Amperage times voltage equals the wattage of the appliance. Thus, wattage divided by voltage calculates the amperage requirements.