Get to know a plug every day - Japanese plug

The plug standard in Japan is determined by the Japanese Industrial Standards (JIS), primarily outlined by the JIS C 8303 standard. This type of plug is commonly referred to as the "Japanese plug" or "NEMA 1-15 plug," named for its resemblance to the American NEMA 1-15 plug. However, despite their visual similarities, Japanese plugs and American plugs differ significantly in some aspects.

Japanese plugs typically feature two flat prongs, contrasting with the round prongs of other plug types. The arrangement of these prongs is designed to perfectly match power sockets within Japan. Usually, one prong is wider than the other to ensure correct insertion orientation. Additionally, some Japanese plugs include an earthing prong, typically a small cylindrical shape, for connection to an earthing hole.

Power sockets in Japan are typically designed with two slots and a side slot equipped with an earthing hole. This design not only ensures proper alignment during plug insertion but also provides a stable electrical connection. The inclusion of an earthing hole ensures grounding of electrical devices, thereby enhancing safety during use.

In Japan, a wide variety of household appliances are commonly used, ranging from major appliances such as televisions and refrigerators to small electronic devices like chargers and electric toothbrushes, all requiring compatibility with standardized sockets and plugs. According to Statistics Japan, as of 2023, the penetration rate of electrical appliances in Japanese households was as high as 99%, with over 80% of households possessing basic appliances such as refrigerators and televisions.

The electrical power system in Japan typically operates at a voltage of 100 volts, with the frequency of the grid possibly being 50Hz or 60Hz, depending on the region. This differs from standards in other countries, potentially requiring the use of transformers or adapters when using foreign appliances to ensure proper functionality.

In summary, the design of plugs in Japan aims to provide a safe and stable electrical connection while perfectly matching power sockets in the country. This unique design reflects Japan's high regard for electrical safety and standardization, offering users a convenient and reliable experience when using electrical appliances.