Wire Sizing Chart
1. Measure the length of wire in the circuit including the ground return. A two-wire circuit will be the total lengths of both the wires. Account for both vehicles on auto and trailer applications.
2. Determine the total current draw of the circuit and round up to determine the amp rating. Then chose the wire size that corresponds to the length and current rating for the circuit.
3. Look across for proper footage to find nearest wire gauge.
18-gauge applications inside of the shaded area could be 20-gauge for electrical purposes. However, it is recommended to use 18-gauge for the tensile strength of the wire. Chart is based on maximum 10% voltage drop @ 100° F (in free air).
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WIRE SIZING CHART
Source: East Penn Wire Guide Chart