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CABLE LENGTH AND CURRENT CAPACITY GUIDE SHOWING CABLE SIZE IN mm².
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Current in amps
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12
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16
|
20
|
25
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32
|
50
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63
|
80
|
105
|
125
|
155
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1
|
1
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1.5
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2.5
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4
|
6
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10
|
16
|
25
|
35
|
50
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70
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2
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2.5
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2.5
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4
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4
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6
|
10
|
16
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25
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35
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50
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70
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3
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4
|
4
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6
|
6
|
10
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16
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16
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25
|
35
|
50
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70
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4
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4
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6
|
6
|
10
|
10
|
16
|
25
|
25
|
35
|
50
|
70
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5
|
6
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6
|
10
|
10
|
16
|
25
|
25
|
35
|
50
|
50
|
70
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6
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6
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10
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10
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16
|
16
|
25
|
25
|
35
|
50
|
70
|
70
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7
|
10
|
10
|
16
|
16
|
16
|
25
|
35
|
50
|
70
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70
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Over
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8
|
10
|
10
|
16
|
16
|
25
|
35
|
50
|
50
|
70
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Over
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9
|
10
|
16
|
16
|
25
|
25
|
35
|
50
|
70
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Over
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10
|
10
|
16
|
16
|
25
|
25
|
50
|
50
|
70
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11
|
10
|
16
|
16
|
25
|
25
|
50
|
70
|
70
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12
|
16
|
16
|
25
|
25
|
25
|
50
|
70
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Over
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13
|
16
|
16
|
25
|
25
|
35
|
50
|
70
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14
|
16
|
16
|
25
|
25
|
35
|
70
|
70
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15
|
16
|
25
|
25
|
25
|
35
|
70
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Over
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17
|
16
|
25
|
25
|
35
|
50
|
70
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8 B&S=
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8mm²
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18
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16
|
25
|
25
|
35
|
50
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70
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6 B&S=
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13.5mm²
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19
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25
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25
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25
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35
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50
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Over
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4 B&S=
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20mm²
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20
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25
|
25
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35
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50
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50
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3 B&S=
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25mm²
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30
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35
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35
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50
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70
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Over
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40
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35
|
50
|
70
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Over
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50 |
70
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70
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Over
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60
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70
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over
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70
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Over
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E.g. Duoetto 12 volt 10 litre Water Heater draws 22 amps per hour on 12 volt and if it is 4 metres from the battery. It requires a cable of at least 8mm² or 8 B&S.
This chart is a guide only.
Note: Cable capacity at 12.6 volt to a maximum loss of 5%.
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