IEC 60287-2-3:20 24作为IEC 60287-2-3:20 24 RLV提供，其中包含国际标准及其红线版本，显示了与上一版本相比技术内容的所有变化。IEC 60287-2-3:20 24描述了一种计算安装在通风隧道中的所有电压电缆的连续额定电流系数的方法。该方法适用于任何类型的电缆。该方法适用于自然通风和强制通风。假设电缆内和隧道周围的纵向热传递可以忽略不计。假设隧道内的所有电缆都是相同的，并且假设隧道横截面不随沿隧道的距离而变化。

IEC 60287-2-3:2024 is available as IEC 60287-2-3:2024 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.

IEC 60287-2-3:2024 describes a method for calculating the continuous current rating factor for cables of all voltages installed in ventilated tunnels. The method is applicable to any type of cable. The method applies to natural as well as forced ventilation. Longitudinal heat transfer within the cables and the surroundings of the tunnel is assumed to be negligible. All cables are assumed to be identical within the tunnel and it is assumed that the tunnel cross-section does not change with distance along the tunnel.