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Heating Cable Repair
22 | nVent.com
nVent.com | 23
Continue heating conductor with the oxy-acetylene
torch (this does not take much heat) and at the
same time touch brazing rod to the end of the
conductor and apply enough silver solder to tin
the end of the conductor. Repeat for remaining
conductors on both cables to be joined.
Hot-cold joint
: Using oxy-acetylene torch, apply heat
to the center of the cold lead conductor with a small
flame (see Appendix E) and touch or wipe brazing
rod onto the
face
of the conductor by turning the rod
between the fingers. This will ensure that the flux melts
off the rod and onto the conductor evenly. Take care
not to get any flux near the end of the cable where it
might contaminate the magnesium oxide powder.
Continue heating cold lead conductor with the
oxy-acetylene torch (this does not take much heat)
and at the same time touch brazing rod to the face
of the conductor and apply enough silver solder
to form a small
bead
on the conductor face. If
repairing two conductor cable, repeat for remaining
cold lead conductor.
Figure 23: Cold lead conductor
Tin the conductors on the heated section using the
procedure above for hot-hot joint.
Note: If repairing a two conductor cable, bend
the two conductors of the heated section cable
into a 'Y' shape (see Figure 25) to accommodate
the distance apart of the cold lead conductors.
Cold lead
Bead