IEC 60079-26:2021规定了包含具有不同设备保护级别（EPLs）的设备部件和分离元件的EB设备的施工、测试和标记要求。该设备安装在需要不同EPL的边界上，例如在不同气体危险区域、粉尘危险区域或与粉尘危险区域相邻的气体危险区域之间。 电气和非电气设备都考虑了分离元件。如果机械能可以转化为潜在的点火源，则根据ISO 80079-36进行额外的点火危险评估，并采取适当的措施。 本文件还规定了两种类型的保护组合的要求，每种保护都与EPL Gb相结合，以实现EPL Ga。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的要求相冲突，则以本文件的要求为准。第四版取消并取代了第三版，构成了技术修订。 请参见IEC 60079-26:2020前言，了解相对于上一版本的主要变化。

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.