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 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.
The requirements of the IEC 60079 series of Standards cover protection with respect to explosion
hazard only. The CSA C22.2 No. 60079 series of Standards (based on the adoption of corresponding IEC
Standards) may be used in conjunction with other applicable Standards containing the appropriate
electrical safety requirements for general use equipment.
Requirements for electrical installations of these systems are found in CSA C22.1, Canadian Electrical
Code, Part I.
General requirements for electrical products are provided in CSA C22.2 No. 0.