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主母线、分支母线的规格、材质。
所有母线和分支母线都用热缩套管覆盖。
All bus and the ramus bus are covered with pyrocondensation bushing.
优良的抗震性，一般机械连接母线槽接头，在墙体受震动后会发生接头松动，而预制分支电缆不会受到影响。
Good earthquake resistance. commonly, mechanical connectors for bus-bars will become flexible after the wall shakes because of earthquake, but the wall shakes have no effect on the branch cable.
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