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Voltage Drop for 8 B&S Cable:
To calculate the voltage drop of 8 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 7.71mm²)
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 8 B&S:
How much voltage drop over 10m of 8 B&S with a current draw of 74A?
- 10m x 74A x 0.017 = 12.58
Divide this by 7.71 (cross sectional area of 8 B&S - mm²)
You will have a drop of approximatley 1.63 Volts over the 10m length