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In order to ensure the safety of high voltage electrical components in normal operation, overhaul, short circuit and overvoltage, high voltage switch cabinet shall be selected according to the following conditions: (1) selection of ambient conditions including temperature, humidity, altitude and earthquake intensity; (2) the normal working conditions include the selection of voltage, current, frequency, mechanical load, etc. (3) the short-circuit conditions include short-term tolerable current, peak tolerance current, rated short-circuit closing and open circuit current, etc. (4) selection of the over-voltage capacity including insulation level; (5) according to different characteristics of various types of high-voltage electrical appliances, including the operation performance of the switch, the protection characteristics of the fuse, the load of the transformer and the accuracy grade, etc.