PD CLC IEC/TS 60079-47:2021 PDF

1   Scope This part of IEC 60079, 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 APLports, 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 , , and , except as modified by this document. Parts of a 2-WISE device can be protected by any Type of Protection listed in 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 , , or , the requirements of this document take precedence.