The switching units are either set up outside of the ex area or can be operated in Zone 1 (example: SS400 ex or SF3).
这个例子不是开关单位以外设立的防爆区域，还是可以在操作区1(：)或SS400钢板前sf3。
The switching units are either set up outside of the ex area or can be operated in Zone 1 (example: SS400 ex or SF3).
这个例子不是开关单位以外设立的防爆区域，还是可以在操作区1(：)或SS400钢板前sf3。
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