WIRING REQUIREMENTS FOR HOUSEHOLD CIRCUITS Each appliance listed in Table C2.4 needs an individual circuit. Protect each appliance with a delay-type fuse or breaker of the size stated by the manufacturer. In the absence of manufacturer recommendation use the size stated in Table C2.4. The delay-type fuses and breakers withstand momentary starting loads and yet protect against overloads and short circuits. Ampere rating of delay-type breakers or fuses for appliances should not be more than 25-percent greater than the appliance rating. For example, if a permanently installed waste-disposer motor is rated at 8 amperes, the delay-type breaker or fuse should not be over 10 amperes; 8 plus 1/4 of 8. Many high-speed electric clothes dryers require range-type outlets. All appliances on 120 volts are to have three-wire grounding-type outlets. Those on 240 volts have a separate ground wire. Estimated Electrical Power Requirements The following are estimated electrical power requirements for various equipment. For specific design applications be sure to consult the literature from the manufacturer for the specific equipment. This is especially important when installing large equipment. The average kilowatt-hours per month shown in the tables may be used in estimating the costs of operation for the equipment shown. The kilowatt-hours per month when multiplied by the electric cost per kilowatt-hour will give the monthly cost of operating the equipment. Table C2.3: Approximate Power Requirements for Equipment Used on the Farm Average Household Equipment (watts) kwhr. per mo. Air conditioner, window unit 3/4-1-1/2 ton 200-500 Baby bottle warmer 50-350 1-4 Blanket, automatic 50-200 15 Bottle sterilizer 500 15 Broiler 1,300-1,600 12 Can opener 50-75 1/2 Clock 1-10 1-4 Clothes dryer 4,000-6,000 30-90 Clippers 40-60 ½
Table C2.3: Approximate Power Requirements for Equipment Used on the Farm (continued) Average Household Equipment (watts) kwhr. per mo. Coffee maker 600-1,000 3-10 Coffee percolator 300-600 3-10 Corn popper 460-650 1 Curling iron 10-20 1/2 Dehumidifier 300-500 50 Dishwasher 1/8-1/4 HP 30 Electrocuter, insect 5-250 4-12 Electronic oven 3,000-7,000 100 Fan, attic 1/6-3/4 HP 60-90 Fan, 8"-16" 35-210 4-10 Food blender 200-300 1/2 Foot warmer 50-100 1 Floor polisher 200-400 1 Freezer, food, 5-30 cu. ft. 300-800 30-125 Freezer, ice cream 50-300 1/2 Fryer, cooker 1,000-1,500 5 Furnace, electric control 10-30 10 Furnace, oil burner 100-300 25-40 Furnace, blower 500-700 25-100 Furnace, stoker 250-600 3-60 Garbage disposal equipment 1/4-1/3 HP 3 Griddle 450-1,100 5 Grill 650-1,300 5 Hair dryer 200-1,200 1/2-6 Heat lamp 125-200 2 Heater, portable 660-2,000 15-30 Heating pad 25-150 1 Hot plate 500-1,650 7-30 House heating 8,000-15,000 1,000-2,500 Humidifier 500 5-15 Iron, hand 600-1,500 6 10
Table C2.3:Approximate Power Requirements for Equipment Used on the Farm (continued) Average Household Equipment (watts) kwhr. per mo. Ironer 1,000-3,000 8-15 Knife sharpener 125 1/4 Lighting 5-300 10-40 Mixer, food 50-200 1 Movie projector 300-1,000 1 Radio, table 40-100 5-10 Range 8,500-16,000 100-150 Record player 75-100 1-5 Refrigerator 200-300 25-40 Refrigerator-freezer 250-600 75 Refrigerator, no-frost 300-400 90 Roaster 1,000-1,600 10-40 Sauce pan 300-1,400 2-10 Sewing machine 30-100 1/2-2 Shaver 12 1/10 Skillet 1,000-1,350 5-20 Sunlamp 100-500 3 Television 200-350 15-30 Toaster 500-1,100 3-5 Vaporizer 200-500 2-5 Waffle iron 550-1,300 1-2 Washer, automatic 300-700 3-8 Washer, conventional 100-400 2-4 Water heater 1,200-7,000 200-300 Water pump (shallow) 1/2 HP 5-20 Water pump (deep) 1/3-1 HP 10-60 Barn Equipment (HP or watts) per unit Barn cleaner 2-5 HP 1/2-1 per cow/mo. Corn, ear crushing 1-5 HP 5 per ton Corn, ear shelling 1/4-2 HP 1 per 300 lbs.
Table C2.3: Approximate Power Requirements for Equipment Used on the (continued) Barn Equipment (Hp or watts) per unit Electric fence 7-10 W 7 per mo. Ensilage blowing 3-5 1/2 per ton Feed grinding 1-7-1/2 1/2-1-1/2 per ton Feed mixing 1/2-1 1 per 500 lbs. Barn Equipment (cont.) (HP or watts) per unit Grain cleaning 1/4-1/2 1 per 100 Bu. Milking, portable 1/4-1/2 1-1/2 per cow/mo. Milking, pipeline 1/2-3 2-1/2 per cow/mo. Sheep shearing fractional 1-1/2 per 100 Silo unloader 3-7-1/2 HP 1-5 per ton Silage conveyor 1-3 HP 1-4 per ton Stock tank heater 200-1,500 W up to 200/mo. Yard lights 100-500 W per mo. Ventilation 1/6-1/3 HP per 20 cows Milkhouse Equipment (HP or watts) per unit Milk cooling 1/2-5 HP 3/4-1-1/2 per 100 lbs. milk Space heater 1,000-3,000 800 per year Ventilating fan fractional 10-25 per mo. Water heater 1,000-5,000 1 per 4 gal.
Table C2.3 Approximate Power Requirements for Equipment Used on the Farm (Continued) Poultry Equipment (HP or watts) per unit Automatic feeder 1/4-1/2 HP 10-30 per mo. Brooder 200-1,000 W 1/2-1-1/2 per chick per season Burglar alarm 10-60 W 2 per mo. Debeaker 200-500 W 1 per 3 hr. Egg Candler 50-100 W 1 per 15 hr. Egg cleaning or washing fractional HP 1 per 2,000 eggs Egg cooling 1/6-1 HP 1-1/4 per case Poultry Equipment (HP or watts) per unit Night lighting 40-60 W 10 per mo. per 100 birds Ventilating fan 50-300 W 1/2-1-1/2 per day day per 1,000 birds Water warming 50-700 W varies widely
Table C2.3 Approximate Power Requirements for Equipment Used on the Farm (Continued) Swine Equipment (HP or watts) per unit Brooding 100-300 W 35 per brooding period per litter Ventilating fan 50-300 W 1/2-1-1/2 per day per 50 hogs Water warming 50-1,000 W 30 per brooding period per litter Farm Shop Equipment (HP or watts) per unit Air compressor 1/4-1 HP 1 per 3 hr. Arc welding 37-1/2 100 per year Battery charging 600-750 W 2 per battery Concrete mixing 1/2-2 HP 1 cu. yard Drill press 1/6-1 HP 1/2 per hr. Fan, 10" 35-55 W 1 per 20 hr. Grinding, emery wheel 1/4-1/3 HP 5 per mo.
Table C2.3 Approximate Power Requirements for Equipment Used on the Farm (Continued) Farm Shop Equipment (HP or watts) per unit Heater, portable 1,000-3,000 W 10 per mo. Heater, engine 100-300 W 1 per 5 hr. Lathe 1/4-1 HP 1 per 3 hr. Lighting 50-250 W 4 per mo. Sawing, circular 8"-10" 1/3-1/2 HP 1/2 per hr. Sawing, jig 1/4-1/3 HP 1 per 3 hr. Soldering, iron 60-500 W 1 per 5 hr. Miscellaneous (HP or watts) per unit Farm motors 1/2-5 HP 1 per HP per hr. Insect trap (black light lamp) 25-40 W 1/3 per night Irrigating 1 HP up 1 per HP per hr. Snow melting: heating cable imbedded in concrete 25 W per sq. ft. 2.5 per 100 sq.ft. Soil heating, hotbed 400 W 1 per day/season Wood sawing 1-5 HP 2 per cord Section Break (Next Page)
Table C2.4: Electrical Power and Wiring Requirements for Household Appliances on Individual Circuits Circuit Probable Outlet Ampere Number of Appliances on Voltage Wattage Rating Wires Individual Circuits Required (watts) (amperes) (numbers) (volts) AWG Wire Size (AWG) Overload- Protection Device Size (amperes) Clothes dryer 6000 240 30 3 + Grnd * ** Washer 500 120 20 2 + Grnd 12 20 Water heater 5000 240 30 2 + Grnd 10 30 Range 10000 240 50 60 3 + Grnd * ** Separate oven 5000 240 30 3 + Grnd 8 30 Surface units 5000 240 30 3 + Grnd 8 30 Dishwasher 1500 120 20 2 + Grnd 12 20 Waste disposer 800 120 20 2 + Grnd 12 ** Freezer 600 120 20 2 + Grnd 12 ** Air conditioner (room) 1500 120 20 2 + Grnd 12 ** Air conditioner 5000 250 50 2 + Grnd * ** (central) Furnace unit 700 120 20 2 + Grnd 12 ** Electric heater 1800 120-240 20 2 + Grnd * ** * Wire size varies, see table C2.11 for wire sizes ** Size varies with appliance, use manufacturer s recommended size or a minimum of 25-percent larger than the appliance electric current rating.
Table C2.5: Electrical Power Requirements of Some Household Appliances Which Do Not Need Individual Circuits Appliance Watts Appliance Watts Coffee maker 700Lighting, fixed 1,200 Lighting, portable 1,200 Deep fat fryer 1,350 Dehumidifier 300 Mixer 120 Electric blanket 160 Phonograph 75 Fan: portable 100 Radio 100 kitchen exhaust 100 Refrigerator 300 attic 345 Roaster 1,650 Frying pan 1,100 Floor lamp, single 200 Sewing machine 75 Floor lamp, 3-way 300 Steam iron 1,000 Floor polisher 200 Sump pump 300 Sun lamp 500 Garage door opener 125 Grill 800 Table lamp 100 Television 350 Iron 1,000 Toaster 1,000 Ironer 1,650 Vacuum cleaner 650 Juice extractor 300 Waffle iron 1,000