独立烟囱顶上环形避雷带及引下线,当采用热镀锌圆钢或扁钢时,其截面规格符 合要求的是()。
A圆钢直径不小于8mm,扁钢截面不小于48mm2,厚度不小于4mm;
B圆钢直径不小于10mm,扁钢截面不小于80mm2’厚度不小于4mm;
C C圆钢直径不小于12mm,扁钢截面不小于100mm2,厚度不小于3mm;
DD圆钢直径不小于12mm,扁钢截面不小于1OOmm2,厚度不小于4mm。
A圆钢直径不小于8mm,扁钢截面不小于48mm2,厚度不小于4mm;
B圆钢直径不小于10mm,扁钢截面不小于80mm2’厚度不小于4mm;
C C圆钢直径不小于12mm,扁钢截面不小于100mm2,厚度不小于3mm;
DD圆钢直径不小于12mm,扁钢截面不小于1OOmm2,厚度不小于4mm。