IEC 60079-26:2021规定了防爆设备的构造、测试和标记要求，防爆设备包含具有不同设备防护等级（EPL）和分离元件的设备部件。该设备安装在需要不同EPL的边界上，例如不同的气体危险区、粉尘危险区或粉尘危险区附近的气体危险区之间。 电气设备和非电气设备均应考虑分离元件。如果机械能可以转化为潜在的点火源，还应根据ISO 80079进行点火危险评估- 执行第36条，并采取适当措施。 本文件还规定了为实现EPL Ga，结合两种类型的保护（每种类型均为EPL Gb）的要求。 本文件补充和修改了IEC 60079-0的一般要求。如果本文件的要求与IEC 60079-0的要求冲突，则以本文件的要求为准。第四版取消并取代第三版，构成技术修订版。 请参阅IEC 60079- 26:2020前言，描述与前一版相关的主要变化。

IEC 60079-26:2021 specifies requirements for construction, testing and marking for Ex Equipment that contains parts of the equipment with different Equipment Protection Levels (EPLs) and a separation element. This equipment is mounted across a boundary where different EPLs are required, for example between different gas hazardous areas, dust hazardous areas or gas hazardous areas adjacent to dust hazardous areas. Separation elements are considered for both electrical and non-electrical equipment. If mechanical energy can be transformed into a potential ignition source, additionally an ignition hazard assessment in accordance with ISO 80079-36 is performed and appropriate measures are undertaken. This document also specifies requirements for the combination of two Types of Protection, each with EPL Gb, to achieve EPL Ga. This document supplements and modifies the general requirements of IEC 60079-0. Where a requirement of this document conflicts with a requirement of IEC 60079-0, the requirement of this document takes precedence. This fourth edition cancels and replaces the third edition and constitutes a technical revision. Please see the IEC 60079-26:2020 foreword for a description of the main changes with respect to the previous edition.