IEC 60079-47:2021(E)是一项技术规范，规定了与双线本质安全以太网概念(2-WISE)一起使用的设备、系统和装置的构造、标记和记录要求，例如IEEE 802.3 cg中定义的双线以太网10BASE-T1L的物理层规范。 2-WISE是高级物理层（APL）的概念，旨在简化APL段内组件和电缆的本质安全参数的检查过程。这是通过根据特定的危险区域要求定义APL端口的通用本质安全参数限制并列出区段设置的一组简明规则来实现的。 双向装置和系统的构造和安装要求包含在IEC 60079-11、IEC 60079-14和IEC 60079-25，除非经本文档修改。双向器械的部件可以通过IEC 60079-0中列出的适用于预期危险区域的EPL的任何类型的保护进行保护。在这些情况下，本技术规范的要求仅适用于设备的本质安全电路。 如果本文件的要求与IEC 60079-0、IEC 60079-11、IEC 60079-14或IEC 60079-25的要求相冲突，则以本文件的要求为准。

IEC 60079-47:2021(E), which is a technical specification, specifies requirements for the construction, marking and documenting of apparatus, systems and installations for use with the 2-Wire Intrinsically Safe Ethernet concept (2-WISE), such as the physical layer specification for 2-Wire Ethernet 10BASE-T1L as defined in IEEE 802.3cg.
2-WISE is a concept for an advanced physical layer (APL), designed to simplify the examination process for intrinsic safety parameters of components and cabling within APL segments. This is achieved by defining universal intrinsic safety parameter limits for APL ports, according to the specific hazardous area requirements and listing a concise set of rules for the segment setup.
The requirements for construction and installation of 2-WISE devices and systems are included in IEC 60079-11, IEC 60079-14, and IEC 60079-25, except as modified by this document. Parts of a 2-WISE device can be protected by any Type of Protection listed in IEC 60079-0 appropriate to the EPL for the intended hazardous area. In these circumstances, the requirements of this technical specification apply only to intrinsically safe circuits of the apparatus.
Where a requirement of this document conflicts with a requirement of IEC 60079-0, IEC 60079 11, IEC 60079-14 or IEC 60079-25, the requirements of this document take precedence.