新的！IEC 60287-3-1:20 17作为IEC 60287-3-1:20 17 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 60287-3-1:20 17适用于所有电压下的电缆稳态运行条件，直接埋在地下、管道、槽或钢管中，土壤部分干燥和不干燥，以及空气中的电缆。术语“稳态”旨在表示仅足以渐近地产生最大导体温度的连续恒定电流(100%负载因子)，假设周围环境条件恒定。本文件定义了现场参考条件，但是一般值被特定的国家要求所取代。与上一版相比，此版本包括以下重大技术变更: -国家铺设条件的最新清单现已列入附件A； -第5条关于买方选择合适电缆类型所需的信息已被删除。

NEW!IEC 60287-3-1:2017 is available as IEC 60287-3-1:2017 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.

IEC 60287-3-1:2017 is applicable to the conditions of steady-state operation of cables at all voltages, buried directly in the ground, in ducts, troughs or in steel pipes, both with and without partial drying-out of the soil, as well as cables in air. The term "steady state" is intended to mean a continuous constant current (100 % load factor) just sufficient to produce asymptotically the maximum conductor temperature, the surrounding ambient conditions being assumed constant. This document defines site reference conditions, however the general values are superseded by specific national requirements. This edition includes the following significant technical changes with respect to the previous edition:
- the updated list of national laying conditions is now covered in Annex A;
- Clause 5 about the information required from the purchaser for the selection of the appropriate type of cable has been removed.