CABLE LENGTH AND CURRENT CAPACITY GUIDE
SHOWING CABLE SIZE IN mm²
AMPS
|
C A B L E L E N G T H I N
|
12
|
16
|
20
|
25
|
32
|
50
|
63
|
80
|
105
|
125
|
155
|
|
|
1
|
1
|
1.5
|
2.5
|
4
|
6
|
10
|
16
|
25
|
35
|
50
|
70
|
|
|
2
|
2.5
|
2.5
|
4
|
4
|
6
|
10
|
16
|
25
|
35
|
50
|
70
|
|
|
3
|
4
|
4
|
6
|
6
|
10
|
16
|
16
|
25
|
35
|
50
|
70
|
|
|
4
|
4
|
6
|
6
|
10
|
10
|
16
|
25
|
25
|
35
|
50
|
70
|
|
|
5
|
6
|
6
|
10
|
10
|
16
|
25
|
25
|
35
|
50
|
50
|
70
|
|
|
6
|
6
|
10
|
10
|
16
|
16
|
25
|
25
|
35
|
50
|
70
|
70
|
|
|
7
|
10
|
10
|
16
|
16
|
16
|
25
|
35
|
50
|
70
|
70
|
Over
|
|
|
8
|
10
|
10
|
16
|
16
|
25
|
35
|
50
|
50
|
70
|
Over
|
||
|
9
|
10
|
16
|
16
|
25
|
25
|
35
|
50
|
70
|
Over
|
|||
|
10
|
10
|
16
|
16
|
25
|
25
|
50
|
50
|
70
|
||||
|
11
|
10
|
16
|
16
|
25
|
25
|
50
|
70
|
70
|
||||
|
12
|
16
|
16
|
25
|
25
|
25
|
50
|
70
|
Over
|
||||
|
13
|
16
|
16
|
25
|
25
|
35
|
50
|
70
|
|||||
|
14
|
16
|
16
|
25
|
25
|
35
|
70
|
70
|
|||||
|
15
|
16
|
25
|
25
|
25
|
35
|
70
|
Over
|
|||||
|
16
|
16
|
25
|
25
|
35
|
50
|
70
|
||||||
|
17
|
16
|
25
|
25
|
35
|
50
|
70
|
8 B&S=
|
8mm²
|
||||
|
18
|
16
|
25
|
25
|
35
|
50
|
70
|
6 B&S=
|
13.5mm²
|
||||
|
19
|
25
|
25
|
25
|
35
|
50
|
Over
|
4 B&S=
|
20mm²
|
||||
|
20
|
25
|
25
|
35
|
50
|
50
|
3 B&S=
|
25mm²
|
|||||
|
30
|
35
|
35
|
50
|
70
|
Over
|
|||||||
|
40
|
35
|
50
|
70
|
Over
|
||||||||
|
50
|
70
|
70
|
Over
|
|||||||||
|
60
|
70
|
over
|
||||||||||
|
70
|
Over
|
Example. A Duoetto 12 volt 10 litre water heater draws 22 amps (that's 22amps an hour) on 12 volt and is 4 metres from the battery. It therefore requires a cable of at least 8mm² or 8 B&S.
Note: Cable capacity at 12.6 volt to a maximum loss of 5%.