Page 132 - Pipeline Rules of Thumb Handbook

Electrical Design 119

Typical wattages for tools and appliances

Equipment Running
Watts
1/2≤ drill 1,000
1≤ drill 1,100
6≤ circular saw 800
10≤ circular saw 2,000
14≤ chain saw 1,100
Radio 50 to 200
Television 200 to 500
Toaster, coffeemaker 1,200
Water heater (storage type) 1,100 to 5,500
Hot plate or range (per burner) 1,000
Range oven 10,000
Skillet 1,200
Fan 50 to 200
Floodlight 1,000
Water pump 500
Vacuum cleaner 200 to 300
Refrigerator (conventional) 200 to 300
Refrigerator (freezer-combination) 250 to 600
Furnace fan (blower) 500 to 700

Knockout dimensions

Knockout
Conduit Dia. Ins.
Size
Ins. Min. Nominal Max.
1/2 0.859 0.875 0.906
3/4 1.094 1.109 1.141
1 1.359 1.375 1.406
1 1/4 1.719 1.734 1.766
1 1/2 1.958 1.984 2.016
2 2.433 2.469 2.500
2 1/2 2.938 2.969 3.000
3 3.563 3.594 3.625
3 1/2 4.063 4.125 4.156
4 4.563 4.641 4.672
5 5.625 5.719 5.750
6 6.700 6.813 6.844

Reference NEMA Standards Publications/No. 250-1991
Used with permission—National Electrical Manufacturer’s Association.