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The amperage rating of a cord is a function of the wire gauge, number of current carrying conductors and length of the cord. When a cord has three current carrying conductors there is a decrease in amperage. Likewise, when the length of the cord exceeds fifty feet there is a decrease in amperage. Use the amp chart below to look up the rated amperage of different sizes and types of cords.

Circuit-conductor ampacity and voltage rating for jacketed cords in general-use cord sets and power-supply cords per UL guidance

Types of Cord Gauge Size Range Number of
Cord Conductors
Number of Current
Carrying Conductors1
Ampacity of Current-Carrying Conductors (amperes) Voltage Rating
of Cord
0 - 50 ft.
(0 - 15.2 m)
Over 50 ft.
(Over 15.2 m)
SOOW - Service Oil Resistant Insulation/
Jacket Weather-resistant
18 AWG 2, 3 or 4
3 or 4
2
3
10 Amps
7 Amps
7 Amps
5.6 Amps
600 Volts AC
16 AWG 2, 3 or 4
3 or 4
2
3
13 Amps
10 Amps
10 Amps
7 Amps
600 Volts AC
14 AWG 2, 3 or 4
3 or 4
2
3
18 Amps
15 Amps
13 Amps
10 Amps
600 Volts AC
12 AWG 2, 3 or 4
3, 4 or 5
2
3
25 Amps
20 Amps
18 Amps
15 Amps
600 Volts AC
10 AWG 2, 3 or 4
3, 4 or 5
2
3
30 Amps
25 Amps
25 Amps
20 Amps
600 Volts AC
8 AWG 2, 3 or 4
3, 4 or 5
2
3
40 Amps
35 Amps
30 Amps
25 Amps
600 Volts AC
6 AWG 2, 3 or 4
3, 4 or 5
2
3
55 Amps
45 Amps
40 Amps
35 Amps
600 Volts AC
4 AWG 2, 3 or 4
3, 4 or 5
2
3
70 Amps
60 Amps
55 Amps
45 Amps
600 Volts AC
2 AWG 2, 3 or 4
3, 4 or 5
2
3
95 Amps
80 Amps
70 Amps
60 Amps
600 Volts AC
18 AWG 2, 3 or 4
3 or 4
2
3
10 Amps
7 Amps
7 Amps
5.6 Amps
300 Volts AC
16 AWG 2, 3 or 4
3 or 4
2
3
13 Amps
10 Amps
10 Amps
7 Amps
300 Volts AC
14 AWG 2, 3 or 4
3 or 4
2
3
18 Amps
15 Amps
13 Amps
10 Amps
300 Volts AC
12 AWG 2, 3 or 4
3, 4 or 5
2
3
25 Amps
20 Amps
18 Amps
15 Amps
300 Volts AC
10 AWG 2, 3 or 4
3, 4 or 5
2
3
30 Amps
25 Amps
25 Amps
20 Amps
300 Volts AC
18 AWG 2 or 3 2 10 Amps 7 Amps 300 Volts AC
17 AWG 2 or 3 2 12 Amps 10 Amps 300 Volts AC
16 AWG 2 or 3 2 13 Amps 10 Amps 300 Volts AC
1A conductor that is used to carry an unbalanced current from the other conductors is not considered to be a current carrying conductor.