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Please Note! The contents of this page are meant only for certified or licensed electricians and other persons in the elecrical trade. If you have an electrical problem or installation please hire a qualified licensed electrician.

Tables

Service Feed wires
ServiceCopperAluminum
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
BreakerWireLoad
15amp#14 wire12 amps
20 amp#12 wire16 amps
30amp#10 wire24 amps
40amp#8 wire32 amps
60amp#6 wire48 amps

Appliances and Approximate Wattages.
ApplianceWattageApplianceWattage
Lighting - Basic1,200 WattsLighting - Full4,000 Watts
Electric Heat5,000 WattsElectric Water Heater5,000 Watts
Refrigrator - 20 Cu Ft800 WattsFreezer - 20 Cu Ft550 Watts
Sump Pump900 WattsWell Pump HP1,000 Watts
Well Pump 1HP2,000 WattsGarage Door Opener HP400 Watts
Microwave Oven 1000W1,500 WattsDishwasher400 Watts
Toaster900 WattsComputer250 Watts
Electric Range Oven7500 WattsTV - 32" Color170 Watts
VCR60 WattsStereo System140 Watts
Clothes Iron1100 WattsElectric Clothes Dryer6000 Watts
Washing Machine1000 WattsHair Dryer1600 Watts
Air Conditioning 1 Ton2,000 WattsAir Conditioning 2 Ton3,000 Watts
Air Conditioning 3 Ton4,500 WattsWindow A/C2000 Watts
Vacuum Cleaner780 WattsCentral Vacuum1750 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 ]

Please Note! The contents of this page are meant only for certified or licensed electricians and other persons in the elecrical trade. If you have an electrical problem or installation please hire a qualified licensed electrician.