信号源可接地或是未接地。

Signal sources can be grounded or floating.

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因为我们的电箱必须使用未接地在德国，保护开关。

Because our electrical boxes must be used are not grounded in Germany, the protection switch.

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未接地信号源的信号(比如电压)没有相应的、诸如大地或建筑物这样的绝对参考点。

A floating source is a source in which the voltage signal is not referenced to any common ground, such as earth or building ground.

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