大型舞台专用设备属一级负荷。
一级负荷中的特别重要负荷,除上述两个电源外,还必须增设应急电源。
In the first-level load shoulders specially importantly, besides the above two power sources, but must additionally build the emergency power supply.
在供电条件比较差的地区,取得第二个电源供给一级负荷有困难时,也需要增设应急备用电源。
In areas of poor power condition, where it's difficult to get an alternative power to supply class 1 load, an emergency power is required.
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