IEC 60909-2:20 08（E）包括从不同国家收集的电气设备数据，必要时用于根据IEC 60909-0计算短路电流。如果低压网络中的短路电流符合用户所在国家使用的典型设备，则它可以用于计算低压网络中的短路电流。收集的数据及其评估可用于中压或高压规划目的，也可用于与制造商或电力供应商提供的数据进行比较。对于架空线路和电缆，在某些情况下，电气数据也可以按照本报告中给出的公式根据物理尺寸和材料计算。第二版取消并取代了1992年出版的第一版，构成了技术修订。与上一版相比的重大技术变更如下: -子条款2.5给出了计算两端护套和屏蔽接地的高压、中压和低压电缆的正序、负序和零序阻抗以及折减系数的公式和示例。 -子条款2.7给出了计算母线配置正序阻抗的公式和图表。

IEC 60909-2:2008(E) comprises data of electrical equipment collected from different countries to be used when necessary for the calculation of short-circuit currents in accordance with IEC 60909-0. It may be applied for calculating short-circuit currents in low-voltage networks if they are in accordance with typical equipment employed in the user's country. The collected data and their evaluation may be used for medium- or high-voltage planning purposes and also for comparison with data given by manufacturers or electricity suppliers. For overhead lines and cables the electrical data may in some cases also be calculated from the physical dimensions and the material following the equations given in this report. This second edition cancels and replaces the first edition published in 1992 and constitutes a technical revision. The significant technical changes with respect to the previous edition are as follows:
- Subclause 2.5 gives equations and examples for the calculation of the positive-, the negative- and the zero-sequence impedances and reduction factors for high-, medium and low-voltage cables with sheaths and shields earthed at both ends.
- Subclause 2.7 gives equations and figures for the calculation of the positive-sequence impedances of busbar configurations.