When the cables use in direct current system, rated voltage should be not greater than 1.5 times of the rated voltage of the cables.
当电缆使用地直流系统时，该系统的额定电压应不大于电缆额定电压的1.5倍。
When the cables use in direct current system, rated voltage should be not greater than 1.
当电缆使用地直流系统时，该系统的额定电压应不大于电缆额定电压的1.5倍。
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