3
Heating Cable Repair
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27
Hot/cold joint:
Apply a small amount of white flux to the
face
of the cold lead conductor. Take care not to get any
flux near the end of the cable where it might contaminate
the magnesium oxide powder.
Using a small flame (see Appendix E), heat the cold lead
conductor with the oxy-acetylene torch (this does not
take much heat) and at the same time touch silver braze
rod to the face of the conductor and apply enough braze
to form a small
bead
on the conductor face (Figure 26).
Repeat for remaining cold lead conductor.
Cold lead
Bead
Figure 26: Form bead on cold lead conductors
Tin
the conductors on the MI heating cable using the
procedure above for the hot/hot joint.
Note: bend the two conductors of the MI heating
cable into a ‘Y’ shape so that the ends are the
same distance apart as the cold lead conductors
(see Figure 28).