家用和类似固定电气装置的电气附件的箱子和外壳 第21部分：具有悬挂装置规定要求的箱子和外壳的具体要求

[中文适用范围]： 本部分 IEC 60670 适用于额定电压不超过 1000 V 交流和 1500 V 直流的家用或类似固定电气安装（室内或室外）的电气附件用盒子、外壳和外壳部件（以下简称“盒子和外壳”）。符合本文件的盒子和外壳适用于环境温度通常不超过 +40°C 的场合，但 24 小时内的平均温度不超过 +35°C，环境空气温度下限为 -5°C。根据盒子和外壳的分类，可以适用超出上述范围的其他温度。本文件适用于带有悬挂装置的顶棚和墙壁安装的盒子和外壳。本文件适用于 IEC 技术委员会 23 范围内的电气附件用盒子和外壳。作为电气附件的一部分并提供保护以防止外部影响（例如机械冲击、固体物体或水的侵入等）的盒子或外壳由相关附件标准涵盖。本文件给出了带有 IK 代码声明的盒子和外壳的测试要求，参见附录 B（规范性）。本文件也适用于 IEC 60670-21、IEC 60670-22、IEC 60670-23 和 IEC 60670-24 中修改的盒子和外壳类型。本文件不适用于：- 顶棚灯座；- 灯具支撑耦合器；- 专门设计用于符合 IEC 61084 的电缆槽和管道系统且不打算在这些系统之外安装的盒子、外壳和外壳部件。 [外文原描述]： IEC 60670-21:2024 EXV contains both the international standard and its extended version (EXV). This extended version of the official IEC Standard is available in English only and provides the user with a comprehensive content of the Standard. IEC 60670-21:2024 EXV includes the content of the references made to IEC 60670-1:2024. IEC 60670-21:2024 applies to boxes, enclosures and parts of enclosures (hereafter called "boxes" and "enclosures") for electrical accessories with a rated voltage not exceeding 1 000 V AC and 1 500 V DC intended for household or similar fixed electrical installations, either indoors or outdoors. Boxes and enclosures complying with this document are suitable for use at ambient temperatures not normally exceeding +40 °C, but their average over a period of 24 h does not exceed +35 °C, with a lower limit of the ambient air temperature of −5 °C. Other temperatures outside the above range can apply according to the classification of the boxes and the enclosures. This document applies to boxes and enclosures for ceiling and wall mounting with provision for suspension means. This second edition cancels and replaces the first edition published in 2004 and Amendment 1:2016. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: a) Complete revision of the tests and requirements of the suspension means.