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（1）每一矿井应有（）回电源线路。矿井电源线路上，严禁装设（）定量器。（2）严禁井下配电变压器中性点（）接地。严禁由地面中性点（）接地的变压器或发电机（）向井下供电。（3）井下不得（）检修、搬迁电气设备（包括电缆和电线）。（4）一切容易碰到的、裸露的电气设备
(1) Each mine should have () back to the power line. Mine power lines, non-installation () Quantitative. (2) underground distribution transformer is prohibited neutral () ground. It is strictly forbidden to supply power to the ground by the transformer (grounding) or generator () grounded by the ground neutral point. (3) Underground shall not () overhaul or relocate electrical equipment (including cables and wires). (4) All bare electrical equipment exposed