IEC 62086-1:2001 pdf free download Electrical apparatus for explosive gas atmospheres – Electrical resistance trace heating – Part 1 : General and testing requirements
This part of lEC 62086 specifies general and testing requirements for electrical resistancetrace heaters for application in explosive gas atmospheres.The standard covers trace heatersthat may comprise either factory- or fieid- (work-site) assembled units，and which may beseries heating cables， parallel heating cables or heating pads and heating panels that havebeen assembled and/or terminated in accordance with the manufacturer’s instructions.
This standard also includes requirements for termination assemblies and control methodsused with trace heating.The hazardous areas referred to by this standard are those defined inIEC 60079-10.
2Normative references
The following normative documents contain provisions which，through reference in this text,constitute provisions of this part of lEC62086. For dated references，subsequentamendments to, or revisions of, any of these publications do not apply. However，parties toagreements based on this part of lEC 62086 are encouraged to investigate the possibility ofapplying the most recent editions of the normative documents indicated below.For undatedreferences,the latest edition of the normative document referred to applies. Members of lECand lso maintain registers of currently valid International Standards.
lEC 60050(151):1978，International Electrotechnical Vocabulary (IEV) – Chapter 151:Electrical and magnetic devices
IEC 60050(426)，International Electrotechnical Vocabulary (IEV) – Chapter 426: Electricalapparatus for explosive atmospheres
IEC 60079-0:1998，Electrical apparatus for explosive gas atmospheres – Part 0: Generalrequirements
IEC 60364-3，Electrical installations of buildings – Part 3:Assessment of general characteristics
3Definitions
For the purpose of this part of IEC 62086, the following definitions as well as the definitionsgiven in lEC 60050(426) and lEC 60079-0 apply.
3.1
ambient temperature
temperature surrounding the object under consideration. Where electrical trace heaters areenclosed in thermal insulation，the ambient temperature is the temperature exterior to suchthermal insulation
3.2
branch circuit
that portion of the wiring installation between the overcurrent device protecting the circuit andthe trace heater unit(s)
3.3
connections(terminations)
3.3.1
cold lead
electrically insulated conductor or conductors used to connect a trace heater to the branchcircuit and designed so that it does not produce significant heat
3.3.2
end termination
termination，which may be heat producing, applied to a trace heater at the end opposite thatwhere the power is supplied
3.3.3
power termination
termination applied to the end of a trace heater at which the power is supplied
3.4
tee
electrical connection of trace heaters, in series or in parallel, to accommodate a tee or branch
3.5
dead leg
segment of process piping segregated from the normal flow pattern for the purpose ofproviding a heat-loss reference
3.6
design loading
minimum power that will meet the design requirements, in the worst conditions， after voltageand resistance tolerances and appropriate safety factors have been considered
3.7
factory fabricated
trace heating cable, tape or device，including the necessary terminations and connections,assembled into units or sets
IEC 62086-1:2001 pdf free download
