Calculate the amperage of the service required for a house measuring 40' times 50'. To determine the size of electrical service entrance, the size of the house, lighting, and appliances should be considered. Also, consider the type and number of branch circuits. Use the minimum code requirement of three watts per square foot to calculate the lighting circuits. Allow a minimum of two small-appliance circuits for the kitchen and one small-appliance circuit for the workshop. Include an electric range with oven, refrigerator, washer, electric dryer dishwasher, garbage disposal, furnace, and a 2000-watt water heater. Refer to the chart in the text for appliance electrical requirements.