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Lett's use 6 B&S as an example.
Voltage Drop for 6 B&S Cable:
To calculate the voltage drop of 6 B&S copper cable, use the following formula:
Voltage Drop = Length x Current x 0.017
Length = Total length of cable in metres.
Current = Current draw (amps) through the cable.
Area = Cross sectional area of the copper (in this case 13.50mm²)
Formula only applies to copper at 25°C, voltage drop increases with both ambient and cable temperature, at approx 0.4% per °C.
0.017 - This multiplication factor only applies to copper
Example for 6 B&S:
How much voltage drop over 10m of 6 B&S with a current draw of 103A?
Divide this by 13.50 (cross sectional area of 6 B&S - mm²)
You will have a drop of approximately 1.3 Volts over the 10m length