Electrical Service Calculations Process
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 |
