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Current limits of extension cords

Using long extension cords should not be used if at all possible. If you look at the chart below you can understand why. Whenever you use an extension cord with a power hungry tool, you should never leave it coiled up. Excessive heat is generated and the insulation can melt causing a serious hazard. Cords usually have the size printed on them in this format 12-3 or 12(gauge)-3(# of wires).

Current limits on extension cords (AMPS)
Cord size
25 ft.
50 ft.
100 ft.
7 amps
5 amps
2 amps
12 amps
7 amps
3.4 amps
16 amps
12 amps
5 amps
20 amps
16 amps
7 amps