# 12 Volt Electric Wire - Length and Current

## Maximum length of copper wire with 2% voltage drop

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Maximum one-way length for two conductor copper wire from power source to load in a *12 volt* system with *2%* voltage drop is indicated below:

### Wire Length - feet

### Wire Length - meter

- double the distance if 4% loss is acceptable
- multiply distance by 2 for 24 volts
- multiply distance by 4 for 48 volts

### Example - Maximum Length of Wire

The current to a light bulb with power *50 W* be calculated with Ohm's law

* I = P / U *

* = (50 W) / (12 V)*

* = 4.2 A*

From the diagram above the maximum length should not exceed approximately *8 m* for wire gauge *#10 (5.26 mm ^{2})*. By increasing the size of the wire to gauge

*#2*

*(33.6 mm*the maximum length is limited to approximately

^{2})*32 m*.

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