IEC 60287-1-3:2023提供了一种计算并联单芯电缆中相电流和循环电流损耗的方法。本文件中描述的方法可用于任何物理布局中每相并联的任何数量的电缆。相电流可以针对任何鞘层结合的布置进行计算。为了计算护套损耗，假设护套在两端结合。IEC 60287-1-2中给出了一种计算扁平结构中两个电路中护套涡流损耗的方法。

IEC 60287-1-3:2023 provides a method for calculating the phase currents and circulating current losses in single-core cables arranged in parallel. The method described in this document can be used for any number of cables per phase in parallel in any physical layout. The phase currents can be calculated for any arrangement of sheath bonding. For the calculation of sheath losses, it is assumed that the sheaths are bonded at both ends. A method for calculating sheath eddy current losses in two circuits in flat formation is given in IEC 60287-1-2.