Tables
Service Feed wires
| Service | Copper | Aluminum |
| 100amps | #4 wire | #2 wire |
| 110amps | #3 wire | #1 wire |
| 125amps | #2 wire | #1/0 wire |
| 150amps | #1 wire | #2/0 wire |
| 175amps | #1/0 wire | #3/0 wire |
| 200amps | #2/0 wire | #4/0 wire |
| 225amps | #3/0 wire | #250 wire |
| 250amps | #4/0 wire | #300 wire |
| 300amps | #250 wire | #350 wire |
| 350amps | #350 wire | #500 wire |
| 400amps | #400 wire | #600 wire |
Breaker Size
| Breaker | Wire | Load |
| 15amp | #14 wire | 12 amps |
| 20 amp | #12 wire | 16 amps |
| 30amp | #10 wire | 24 amps |
| 40amp | #8 wire | 32 amps |
| 60amp | #6 wire | 48 amps |
Appliances and Approximate Wattages.
| Appliance | Wattage | Appliance | Wattage |
| Lighting - Basic | 1,200 Watts | Lighting - Full | 4,000 Watts |
| Electric Heat | 5,000 Watts | Electric Water Heater | 5,000 Watts |
| Refrigrator - 20 Cu Ft | 800 Watts | Freezer - 20 Cu Ft | 550 Watts |
| Sump Pump | 900 Watts | Well Pump ½ HP | 1,000 Watts |
| Well Pump 1HP | 2,000 Watts | Garage Door Opener ½ HP | 400 Watts |
| Microwave Oven 1000W | 1,500 Watts | Dishwasher | 400 Watts |
| Toaster | 900 Watts | Computer | 250 Watts |
| Electric Range Oven | 7500 Watts | TV - 32" Color | 170 Watts |
| VCR | 60 Watts | Stereo System | 140 Watts |
| Clothes Iron | 1100 Watts | Electric Clothes Dryer | 6000 Watts |
| Washing Machine | 1000 Watts | Hair Dryer | 1600 Watts |
| Air Conditioning 1 Ton | 2,000 Watts | Air Conditioning 2 Ton | 3,000 Watts |
| Air Conditioning 3 Ton | 4,500 Watts | Window A/C | 2000 Watts |
| Vacuum Cleaner | 780 Watts | Central Vacuum | 1750 Watts |
To find the approximate amperage of electrical devices use the Ohms Law formula, Amps = Watts divided by Volts. Example... A 1,200 watt device at 120 volts would be 10 amps.
[ Three Way I Switch Diagrams ]