低压电气装置 第 4-43 部分：安全保护 过电流保护

[中文适用范围]： 本部分IEC 60364提出了以下要求： - 对相线、PEN线、PEM线和PEL线提供保护，防止过电流产生的有害影响； - 协调过电流保护措施。 注1：本文件的要求未考虑外部影响。 注2：按照本文件对导体的保护，不一定能保护连接到导体的设备。 注3：通过插头和插座将设备连接到固定安装的柔性电缆不属于本文件的范围，因此不一定对过电流产生的有害影响提供保护。 [外文原描述]： IEC 60364-4-43:2023 provides requirements for: - protection of live conductors, PEN conductors, PEM conductors, and PEL conductors against the harmful effects caused by overcurrent; - coordination of measures for protection against overcurrent. This fourth edition cancels and replaces the third edition published in 2008. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: a) the standard has been restructured, see Table 1 (Correspondence between IEC 60364‑4‑43:2008 and this document) below; b) the measure "automatic disconnection of supply" has been designated as the preferred measure for protection against overcurrent; c) all measures except the measure "automatic disconnection of supply" have been transferred into new normative annexes to indicate that these measures are usable in certain applications and under certain restricted conditions only (see Annex A, Annex B and Annex E); d) a new clause "Terms and definitions" has been added; e) new requirements have been added for the protection of the neutral or mid-point conductor (with and without triplen harmonics).