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I had a bit of a look over lunch and found this table in one of my "how to build a kit car" books.
Cable sizes:
For side, tail, fog, flashers, radio and panel lamps. rating 8.75 amps. 14/0.3 metric or 14/0.012 imperial
Headlamps, horns, heated rear windows. rating 17.5 amps 28/0.3 metric or 28/0.012 imperial
Battery and generator 27.5 amps 44/0.3 metric or 44/0.012 imperial
Alternator charging 35 amps 65/0.3 metric or 65/0.012 imperial.
Earth wires need to be the same size as the live wire feeding the component.
For example 14/0.30, (1.0mm²) refers to 14 strands of 0.30mm diameter cable giving a total cable conductor area of 1.0mm².
So as @Hippo said, that is what you'll need.
(as .30 is the diameter of each strand, pi r squared gives us .15 x .15 x 3.14159 = 0.071
This times the number of strands (14) gives us 0.99 square millimetres so 1.00mm2.)
The resistance of one kilometre of copper wire 1.00 mm in diameter is 17 ohms. Just out of interest.
The thicker the wire the less the resistance therefore the less heat generated therefore the more smoke you can keep in the wire!!!
Cable sizes:
For side, tail, fog, flashers, radio and panel lamps. rating 8.75 amps. 14/0.3 metric or 14/0.012 imperial
Headlamps, horns, heated rear windows. rating 17.5 amps 28/0.3 metric or 28/0.012 imperial
Battery and generator 27.5 amps 44/0.3 metric or 44/0.012 imperial
Alternator charging 35 amps 65/0.3 metric or 65/0.012 imperial.
Earth wires need to be the same size as the live wire feeding the component.
For example 14/0.30, (1.0mm²) refers to 14 strands of 0.30mm diameter cable giving a total cable conductor area of 1.0mm².
So as @Hippo said, that is what you'll need.
(as .30 is the diameter of each strand, pi r squared gives us .15 x .15 x 3.14159 = 0.071
This times the number of strands (14) gives us 0.99 square millimetres so 1.00mm2.)
The resistance of one kilometre of copper wire 1.00 mm in diameter is 17 ohms. Just out of interest.
The thicker the wire the less the resistance therefore the less heat generated therefore the more smoke you can keep in the wire!!!