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3
Heating Cable Repair
3.1
General
• For field modifications, heating cable resistance
be obtained from the product data sheets, H56870
for Alloy 825 sheath heating cables and H56990
for copper sheath heating cables.
• For field repairs, check continuity of both sections
–For two conductor heating cable, conductors or
–For single conductor heating cable, the conductor
• Follow appropriate repair procedure to make a
• When brazing, avoid excessive heating of parts
• Once a joint or end cap installation has
should be checked with an ohmmeter to ensure
that it is within ± 10% of the cable's calculated
resistance.
Calculated resistance = heated length (ft) x Ω/foot;
(heated length (m) x Ω/meter)
Note: Ω/foot (Ω/meter) of heating cable may
of cable to be joined using the ohmmeter. If open
circuited, other faults may exist in the cable.
tails on far end of cable may have to be shorted
together.
or tail on far end can be shorted to the sheath and
continuity checked between the conductor and
sheath on opposite end.
joint (Section 3.3) or end cap (Section 3.4).
to be joined as this can lead to embrittlement
of materials and cause the silver solder at the
conductor joint to melt.
been started, it must be completed without
interruptions. This will prevent the cable from
absorbing moisture and causing a decrease in the
insulation resistance.
nVent.com | 11
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