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4.1.33电气设备的金属外壳、底座、金属电线管、配电盘以及配电装置的金属构件、遮栏和电缆线的金属外包皮等，均应采用保护接地或接零；接零系统应有重复接地，接地电阻不应大于4Ω。
分值:4.0
不符合要求的，发现一处扣1分，发现两处不得分。