国产300平方毫米铜导体PVC绝缘电缆的在空气中敷设的载流量是：
单芯 473*1.29=610.17A
三芯或四芯 328*1.29=423.12A
交联聚乙烯XLPE绝缘的电缆载流量可以优于上述数值，但电缆较硬。

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