IEC 60287-1-1:20 23适用于电缆在所有交流电压和高达5 kV的直流电压下的稳态运行条件，直接埋在地下、管道、槽或钢管中，无论是否土壤部分干燥，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。本文件提供了电流额定值和损耗的公式。给出的公式基本上是字面上的，并且有意地保留了某些重要参数的选择。这些可分为三类: -与电缆结构相关的参数(例如，绝缘材料的热阻性)，其代表值已基于已发表的工作而被选择；-与周围条件有关的参数，这些参数可以变化很大，其选择取决于使用或将要使用电缆的国家； -由制造商和用户之间的协议产生的参数，其涉及服务安全性的余量（例如，最高导体温度）。

IEC 60287-1-1:2023 is applicable to the conditions of steady-state operation of cables at all alternating voltages, and direct voltages up to 5 kV, 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 provides formulae for current ratings and losses. The formulae given are essentially literal and designedly leave open the selection of certain important parameters. These can be divided into three groups:
- parameters related to construction of a cable (for example, thermal resistivity of insulating material) for which representative values have been selected based on published work;
- parameters related to the surrounding conditions, which can vary widely, the selection of which depends on the country in which the cables are used or will be used;
- parameters which result from an agreement between manufacturer and user and which involve a margin for security of service (for example, maximum conductor temperature).