IEC 60721-2-4:20 18 RLV包含国际标准及其红线版本。红线版本只有英文版本。Redline版本为您提供了一种快速简单的方法来比较该标准与其前一版本之间的所有变化。红线版本不是IEC官方标准，只有标准的当前版本才被视为官方文件。 ？ IEC 60721-2-4:20 18对太阳辐射区域的类型进行了广泛的划分。当为产品应用选择适当的太阳辐射强度时，它旨在用作背景材料的一部分。除海拔5 000米以上的地区外，涵盖所有类型的地理区域。本第二版取消并取代1987年出版的第一版和修正案1:1988.本版是技术性修订。与上一版相比，此版本包括以下重大技术变更: -更新了数字，包括增加了全球辐照信息 -格式已更新。

IEC 60721-2-4:2018 RLV contains the International Standard and its Redline version. The Redline version is available in English only. The Redline version provides you with a quick and easy way to compare all the changes between this standard and its previous edition. The Redline version is not an official IEC Standard, only the current version of the standard is to be considered the official document.
？ IEC 60721-2-4:2018 presents a broad division into types of solar radiation areas. It is intended to be used as part of the background material when selecting appropriate severities of solar radiation for product applications. All types of geographical areas are covered, except areas with altitudes above 5 000 m. This second edition cancels and replaces the first edition published in 1987 and Amendment 1:1988. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
- Figures updated including the addition of global irradiation information
- Format updated.