Page 7
Current
Draw
(AMPS)
Wire Gauge
Calculation Chart
All Distances Shown Are In Feet
INS. = Insufficient
5
22
6
3
INS.
INS. INS.
INS.
INS. INS.
INS.
INS.
INS. INS.
INS. INS.
INS. INS.
INS. INS.
INS. INS.
INS. INS.
INS. INS. INS.
INS. INS. INS.
INS. INS. INS.
INS. INS. INS.
INS. INS. INS.
INS. INS. INS.
INS.
INS.
INS.
INS.
INS.
INS.
INS.
INS.
INS.
INS.
INS.
INS.
INS.
INS.
INS.
INS.
INS.
INS.
INS.
INS.
INS.
INS.
INS.
INS.
INS.
INS.
INS.
INS.
INS.
INS.
20
9.5
5
3
18
15
7.5
5
4
3
16
24.5
12
8
6
5
4
3.5
3
14
39
19.5
13
9.5
8
6.5
5.5
5
4.5
4
3.5
3
3
3
12
62
31
20.5
15.5
12.5
10.5
9
7.5
7
6
5.5
5
5
4.5
4
4
3.5
3.5
3.5
3
10
98
49
32.5
24.5
19.5
16.5
14
12.5
11
10
9
8
7.5
7
6.5
6
6
5.5
5
5
8
156
78
52
39
31
26
22.5
19.5
17.5
15.5
14
13
12
11
10.5
10
9
8.5
8
8
6
248
124
82.5
62
49.5
41.5
35.5
31
27.5
25
22.5
20.5
19
17.5
16.5
15.5
14.5
14
13
12.5
4
395
197
131
98.5
79
66
56.5
49.5
44
39.5
36
33
30.5
28
26.5
24.5
23
22
21
19.5
2
629
314
209
157
125
104
89.5
78.5
69.5
63
57
52.5
48.5
45
42
39
37
35
33
31.5
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
85
90
95
100
Wire Gauge (AWG)
To use this chart...
1. Determine the amount of current being drawn through the wire. Locate this number in the vertical left-hand
column. If the current value is between adjacent values, use the higher number.
2. Follow this row until the length of the installed wire is shown. If the exact length is between adjacent values, use
the higher number. Follow this column upwards to find the recommended size (gage) for this wire.
In the example shown below, the size for a wire with an installed length of 36 feet, through which 22 amps of current
will be drawn, must be determined.
A row for 22 amps is not shown, so the row for 25 amps will be used. Follow this row to the right. A column for 36 feet
is not shown, so the column for 49.5 feet will be used. Following this column to the top will show that the size of this
wire must be at least 6 gage.
