Copper cored cables : The conductor is specified by the number of strands and cross sectional area per strand in millimetres squared (mm²).
Always route vehicle cables to avoid chaffing of insulation against moving parts of machinery.
Always fit adequate fusing to protect the cable.
Calculate the correct size of cable required using Ohms law and take account of voltage drop
over distance of cable run and temperature or environment where cable is placed.
9/0.3 mm² mm cable has 9 strands of 0.3mm diameter to make the 0.65mm sq cross sectional area,
typical continuous rating would be 5 Amps depending on length of cable run, and heat dissipation.
5 Amps at 12 volts would equate to a maximum 60 Watt load using Ohms law formula to calculate (Power in Watts) P = Current (I) x Voltage (v).
A safety factor should be included when calculating cable load and cable size upgraded to suit.
Typical application for 9/0.3 mm²mm cable would be supply to low wattage led lighting , or control circuits of 12v relays
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