3
Heating Cable Repair
20 | nVent.com
nVent.com | 21
Hot-hot joint
: Using the tube cutter,
lightly
score the
sheath on each end of the heated section cables
approximately 3/16 in (5 mm) from the end of each
cable. With the diagonal cutters, remove the sheath
up to the score mark. See note below.
Hot-cold joint
: Using the tube cutter, score the
sheath of the cold lead section approximately 1/4 in
(6 mm) from the end of the cable. With the diagonal
cutters remove the sheath up to the score mark.
Using diagonal cutters strip back the sheath of the
heated section, without the aid of the tube cutter,
approximately 1/4 in (6 mm).
Note: Do not cut too deeply with the tube
cutter as this will cause the sheath to be pushed
inwards towards the conductors, possibly resulting
in cable failure. See Appendix G for detailed
instructions on stripping cable sheath.
Score
Figure 20: Strip cable sheath
Clean magnesium oxide powder from the conductors
of the heated section cables with emery cloth or
use side cutters to lightly scrape conductor surface.
Conductor surface must be free of powder for silver
solder to bond.