What size wire is recommended for a starter motor with a 28-volt system using 20 feet of wire and 200 amps?

When selecting a wire size for a starter motor in a 28-volt system, several factors come into play: the current (200 amps), the length of the wire run (20 feet), and the acceptable voltage drop. In this scenario, the wire must be capable of handling the high current without excessive voltage drop or heating.

For high-amperage applications like starter motors, wire sizes are typically determined based on the American Wire Gauge (AWG) standards. Using these guidelines, No. 1 AWG wire is recommended for a 200-amp load over a distance of 20 feet in a 28-volt system. This wire gauge can handle the necessary current capacity while minimizing resistance and ensuring efficient operation of the starter motor.

Choosing a wire size that is too small can lead to overheating, voltage drops, and potential failures in the electrical system. Therefore, the recommendation for No. 1 AWG wire ensures a safe and efficient connection to the starter motor in this specific application.