What is the appropriate gauge size for a fusible link?

The appropriate gauge size for a fusible link is the same gauge size as the wiring it protects. This is because the fusible link is designed to be the weak point in the electrical circuit, which will melt and break the circuit when excessive current flows through it. Using the same gauge ensures that the fusible link can handle normal current levels without failure while still providing adequate protection in the event of an overload.

If a fusible link were smaller than the wiring it protects, it might blow too easily under normal operating conditions. Conversely, if it were larger, it might not break when necessary, failing to protect the rest of the wiring from damage caused by excessive current. Having a fusible link that is the same gauge size strikes the right balance to ensure proper functioning and safety in the electrical system.