In Chengdu, the electrical system follows the standard for mainland China, utilizing three primary plug types: Type A (two flat parallel pins), Type C (two round pins), and Type I (three flat pins in a v-shape/triangular pattern). Most modern wall sockets feature a hybrid design with two slots, where the top opening accommodates both Type A and Type C plugs, while the bottom opening is specifically for the grounded Type I plug. The standard voltage is 220V at a frequency of 50Hz, which is higher than the 110V standard in countries like the United States and Japan. Consequently, while travelers from North America may find their two-prong Type A plugs fit into local outlets, they must check that their devices are dual-voltage (typically labeled "INPUT: 100-240V") or use a voltage converter to prevent damage. For those coming from Australia or New Zealand, their Type I plugs are generally compatible with the standard three-pronged grounded sockets found throughout the city.