scope:

1.1 DE This

part of IEC 60079, which is a technical specification,

document

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.

1.2 DR The requirements for construction and installation of 2-WISE devices and systems are included in

IEC 60079-11

UL 60079-11

,

IEC 60079-14

NFPA 70, National Electrical Code (NEC)

, and

IEC 60079-25

UL 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

UL 60079-0

appropriate to the EPL for the intended hazardous area. In these circumstances, the requirements of this

technical specification

document

apply only to intrinsically safe circuits of the apparatus.

1.3 DR Where a requirement of this document conflicts with a requirement of

IEC 60079-0

UL 60079-0

,

IEC 60079-11

UL 60079 11

,

IEC 60079-14

NFPA 70

or

IEC 60079-25

UL 60079-25

, the requirements of this document take precedence.

1.4 DE Where references are made to IEC and ISO standards, the referenced requirements found in these standards shall apply as modified by any applicable US National Differences for the standard (see Clause 2).