Why are hair dryers wired with a two core cable?

Hair dryers are wired with a two-core cable primarily for safety and efficiency. The two-core design includes one live wire and one neutral wire, which allows for the safe operation of the appliance without requiring a separate earth connection, as the components are typically double-insulated. This minimizes the risk of electric shock while ensuring the device can operate at high power levels necessary for drying hair quickly. Additionally, the absence of an earth wire reduces weight and increases portability.