Each set of charging devices should have two channels of AC input, which are mutually standby. When the running AC input loses, it can automatically switch to the standby AC input power supply.
    For a rated AC 220V charging device, the phase voltage should be detected; for a rated AC input 390V charging device, the line voltage should be monitored. The accuracy of the meter should not be less than 1.5.
    The DC power system should be equipped with protection against overvoltage.
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