The earth wire was not connected.
地线没有接上。
Please ensure that the earth wire is connected reliably.
请确认地线衔接牢靠。
The earth wire of the UPS must then be connected to an efficient earth system.
UPS的地线必须与有效的接地系统连接。
The earth wire of the UPS must then be connected to an efficient earth system.
UPS的地线必须与有效的接地系统连接。
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