What is the minimum AWG for wires from the sensor to the ground fault relay?

The minimum American Wire Gauge (AWG) for wires from the sensor to the ground fault relay should be No. 14. This gauge is commonly accepted for low-voltage applications, including connections involving ground fault relays, as it provides a balance between adequate current-carrying capacity and flexibility.

Using No. 14 AWG wire helps ensure that the wire can safely carry the necessary load without overheating while still being manageable for installation in various environments, especially those where space may be limited. In electrical installations, it's essential to use wiring that meets or exceeds the minimum requirements set forth in the National Electrical Code (NEC) to ensure safety and reliability.

Larger gauge wires, such as No. 10 or No. 12, while capable of carrying more current and better suited for higher power applications, are typically unnecessary for sensor-to-relay connections. Smaller gauges like No. 16 might not provide sufficient capacity, thereby posing a risk of overheating or failure in a situation where the circuit requires a more robust conductor. Hence, No. 14 AWG strikes the right balance for the application described.