IEC 62086-1:2001 pdf download

IEC 62086-1:2001 pdf download.Electrical apparatus for explosive gas atmospheres – Electrical resistance trace heating – Part 1: General and testing requirements.
3.2
branch circuit
that portion of the wiring installation between the overcurreni device protecting the circuit and the trace heater unit(s)
3.3
connections
(terminations)
3.3.1
cold lead
electrically insulated conouctoi 01 conouctors used to connect a trace neater to Inc branch circuit 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 that where 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 of providing a heat-loss reference
3.6
design loading
minimum power that will meet the design requirements. in the worst conditions, after voltage and 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
3.8
field-assembled
trace heaters supplied in bulk with terminating components to be assembled at the work site
3.9
heat loss
energy flow from a pipe, vessel or equipment to its surroundings
3.10
heat sink
part that conducts and dissipates heat away from a workpiece
NOTE Typ.cal heat sinks are ppe shoes, pip. iupports ajid items ol large visas such as valve actuators or pump bodies.
3i1
heat-transfer aids
thermally conductive materials, such as metallic foils or heat-transfer compounds used to increase the heat-transfer efficiency from trace heaters to the worlcpiece
3.12
heating pad
trace heater comprising series- or parallel-connected elements having sufficient flexibility to conform to the shape of the surface to be heated
3.13
heating panel
non-flexible trace heater comprising series• or parallel-connected elements fabricated to conform to the general shape of the surface to be heated
3.14
high-limit temperature
maximum allowable temperature of the system, including piping, fluid and heating system
3.15
maximum ambient temperature
highest ambient temperature at which the trace heating is operable and should perform according to spec if ied requirements
3.16
maximum withstand temperature
maximum operating or exposure temperature that will not adversely effect the thermal stability of the heater and its component parts
3.17
metallic covering
metal sheath or braid used to provide physical protection for a trace heater. and?or an electncal earth path
3.18
minimum ambient temperature
lowest ambient temperature specified at which trace heating is operable and performs according to specified requirements (and on which heat-loss calculations are based)
3.19
operating voltage
actual voltage applied to the trace heater when in service
3.20
overjacket
continuous layer of insulating material applied outside the metallic sheath, screen or armouring to protect against corrosion
3.21
power density
power output in walts per linear metre for trace heater cables and cable units, and in watts
Rerso
per square metre tor trace heater pads and panels and trace heater pad and panel units
3.22
rated output
total power or power per unit length of heating cable or trace heater, at rated voltage,
temperature and length, which is normally expressed in watts per metre or watts per square
metre
3.23
rated voltage
voltage to which operating and performance characteristics of trace heaters are referred
routine test
test to which each individual device is subjected during or after manufacture to ascertain
whether it complies with certain criteria
[IEV 151-04-16]
3.25
series trace heater(s)
heating elements electrically connected in series with a single current path and with a specific
resistance at a given temperature for a given length
3.26
sheath
uniform and continuous metalic or non-metallic outer covering enclosing the heating tape or
cable used to provide protection for the cable against influence from the surroundings
(corrosion, moisture etc.). See overjacket, 3.20
3.27
sheath temperature
temperature of the outermost continuous covering that may be exposed to the surrounding
atmosphere
3.28
stabilized design
concept where the temperature of the trace heater will, by design and use, stailze below the
limiting temperature, under the most unfavourable conditions, without the need for a
protective system to limit the temperature
3.29
start-up current
current of a trace heater immediately upon energizing
3.30
system documentation
information provided by the supplier to allow satistactory understanding, installation and safe
use of the trace heating system.