UL 60079-30-1:2017 Explosive Atmospheres 一Part 30-1: Electrical Resistance Trace Heating 一General and Testing Requirements.
connections (terminations)
cold lead
electrically insulated conductor or conductors used to connect a trace heater to a branch circuit and designed so that it does not produce significant heat
[SOURCE: lEG 60050-426:2008, 426-20-03]
end termination
termination, which may be heat producing, applied to a trace heater at the end opposite to that where the power is supplied
[SOURCE: lEG 60050-426:2008, 426-20-04]
power termination
termination applied to the end of a trace heater at which the power is supplied
[SOURCE: lEG 60050-426:2008, 426-20-05]
electrical connection of trace heaters, in series or in parallel, to accommodate a branch or a branch circuit
[SOURCE: IEC 60050-426:2008, 426-20-06, modified (“tee or branch” replaced by “branch or a branch circuit”)]
controlled design
design where the set point of the applicable temperature controller or high-limit device is used in establishing the maximum sheath temperature
dead leg
segment of process piping segregated from the normal flow pattern for the purpose of providing a heat loss reference
[SOURCE: IEC 60050-426:2008, 426-20-07]
design loading
minimum power that meets the design requirements, in the specified adverse conditions minimum ambient and maximum wind velocity), after voltage and resistance tolerances and appropriate safety factors have been considered
[SOURCE: lEG 60050-426:2008, 426-20-08]
electrically conductive covering
metallic sheath, metallic braid or other conductive material
factory fabricated assembled into units or sets, including the necessary terminations and connections
[SOURCE: IEC 60050-426:2008, 426-20-09]
field assembled supplied in bulk with terminating components to be assembled at the work site
[SOURCE: IEC 60050-426:2008, 426-20-10]
heat loss
energy flow from a pipe, vessel or equipment to its surroundings
heat sink
part that conducts and dissipates heat away from a workpiece.UL 60079-30-1 pdf download.