IEC 60287-2-1:2023仅适用于电缆在所有交流电压和5 kV以下直流电压下的稳态运行条件，这些电缆直接埋在地下、管道、槽或钢管中，无论土壤是否部分干燥，以及空气中的电缆。术语“稳态”是指连续恒定电流（100%负载系数），刚好足以渐进地产生最大导体温度，假设周围环境条件不变。

IEC 60287-2-1:2023 is solely 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, in 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.