Circuit-conductor ampacity and voltage rating for jacketed cords in general-use cord sets and power-supply cords per UL guidance
| Types of Cord |
Size of Conductors in Cord |
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) |
| S, SO, SOO, ST, STO, STOO, SE, SEO, or SEOO |
18 |
2, 3 or 4
3 or 4 |
2
3 |
10
7 |
7
5.6 |
600
600 |
| 16 |
2, 3 or 4
3 or 4 |
2
3 |
13
10 |
10
7 |
600
600 |
| 14 |
2, 3 or 4
3 or 4 |
2
3 |
18
15 |
13
10 |
600
600 |
| 12 |
2, 3 or 4
3, 4 or 5 |
2
3 |
25
20 |
18
15 |
600
600 |
| 10 |
2, 3 or 4
3, 4 or 5 |
2
3 |
30
25 |
25
20 |
600
600 |
| 8 |
2, 3 or 4
3, 4 or 5 |
2
3 |
40
35 |
30
25 |
600
600 |
| 6 |
2, 3 or 4
3, 4 or 5 |
2
3 |
55
45 |
40
35 |
600
600 |
| 4 |
2, 3 or 4
3, 4 or 5 |
2
3 |
70
60 |
55
45 |
600
600 |
| 2 |
2, 3 or 4
3, 4 or 5 |
2
3 |
95
80 |
70
60 |
600
600 |
| SJ, SJO, SJOO, SJT, SJTO, SJTOO, SJE, SJEO, or SJEOO |
18 |
2, 3 or 4
3 or 4 |
2
3 |
10
7 |
7
5.6 |
300
300 |
| 16 |
2, 3 or 4
3 or 4 |
2
3 |
13
10 |
10
7 |
300
300 |
| 14 |
2, 3 or 4
3 or 4 |
2
3 |
18
15 |
13
10 |
300
300 |
| 12 |
2, 3 or 4
3, 4 or 5 |
2
3 |
25
20 |
18
15 |
300
300 |
| 10 |
2, 3 or 4
3, 4 or 5 |
2
3 |
30
25 |
25
20 |
300
300 |
| SV, SVO, SVOO, SVT, SVTO, SVTOO, SVE, SVEO, or SVEOO |
18 |
2 or 3 |
2 |
10 |
7 |
300 |
| 17 |
2 or 3 |
2 |
12 |
10 |
300 |
| 16 |
2 or 3 |
2 |
13 |
10 |
300 |
| 1A conductor that is used to carry an unbalanced current from the other conductors is not considered to be a current carrying conductor. |