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Home Electrical Service Calculation


electrical-service-calculating Summary: The home electrical service size is based upon the electrical loads and the required circuits specified by the electrical codes as shown in this example.

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Electrical Service Calculations Process


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This electric service calculation is based on a single family home of 3000 square foot with the following electrical loads:

1- 12 kw electric range

20 kw of electric space heating (1 central elect. heating unit)

1- 5 kw electric water heater

1-central air conditioner, 9 kw

1- dishwasher, 1 kw

1- disposal, 0.9 kw

1- electric clothes dryer, 4500 watt

NEC Electric Service Calculation - Home 3000 sq. ft.

NEC Ref. Load VA
220-3a General Lighting, 3000 sq ft x 3 watts = 9000 --
220-16a 2 Small Appliance, 1500 ea= 3000 --
220-16b Laundry = 1500 --
Table 220-11 Total General Lighting, Small Appl., Laundry = 13500 --
Table 220-11 Apply Demands, 1st 3000 watts 3000
Table 220-11 Balance(10500 watts) at 35 percent 3675
220-18 Dryer (minimum 5k) 5000
220-19 Range (from col C) 8000
220-17 Add Fixed Appliance x 100 percent (not more than four) 6900
220-21 Larger of Heat / Air Conditioning 20000
VA Total 46575
Amps Divide by 240 (volts) = 194
310-15(b)6 200 Amp service wire: 2/0 copper

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