GB 50052-2009 第3.0.2条
| First-class loads shall be supplied by two independent power sources; second-class loads should be supplied by two feeder circuits; third-class loads may be supplied by a single power source. |
| First-class loads shall be supplied by two independent power sources; second-class loads should be supplied by two feeder circuits; third-class loads may be supplied by a single power source. |
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