The proper size of wires mainly depends on the amount of load current & voltage supplied as well as the length of the cable. Usually, the voltage drop in cables should not be greater then 2.5% of the supply.
- Measure the supply voltage.
- Calculate its 2.5% allowable voltage drop.
- Measure the required length of the cable in meters.
- Divide the allowable voltage drop with the length.
- The resultant is the max allowable voltage-drop per meter & your required cable size should have a lower voltage drop than this.
- Calculate your load current.
The cable charts provide this info such as voltage-drop per meter, current capacity, cable size, etc. match your calculation with the chart & find you required cable size.
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