* Safety: The fuse is designed to break the circuit and stop the flow of electricity if there's a fault or overload. By placing it on the live wire, it interrupts the flow of current to the load (the device being powered).

* Preventing Electric Shock: If the fuse were on the neutral wire, a fault in the circuit could still allow a dangerous voltage to be present on the metal parts of the device, potentially causing an electric shock.

Important Note: The specific wire you choose for the fuse will depend on the type of circuit and the design of the fuse holder. However, the general principle is to place the fuse on the live wire for safety and proper operation.