当单位自动地被塞住入ac出口它自检、检查对于正确极性和测试设备地面的正直，即。绿色导线在分支电路。
When the unit is plugged into an AC outlet it automatically self-tests, checks for correct polarity and tests the integrity of the equipment ground, i. e. the green wire in the branch circuit.
当单位自动地被塞住入ac出口它自检、检查对于正确极性和测试设备地面的正直，即。绿色导线在分支电路。
When the unit is plugged into an AC outlet it automatically self-tests, checks for correct polarity and tests the integrity of the equipment ground, i. e. the green wire in the branch circuit.
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