Figure 2-38.Soldering iron safety devices.
What is the purpose of a heat shunt?
Conductors within equipment must be kept in place to present a neat appearance and aid in tracing
the conductors when alterations or repairs are required. This is done by LACING the conductors into wire
bundles called cables. An example of lacing is shown in figure 2-39. When conductors are properly laced,
they support each other and form a neat, single cable.
Figure 2-39.Conductor lacing.
A narrow, flat tape should be used wherever possible for lacing and tying. This tape is not an
adhesive type of tape. Round cord may also be used, but its use is not preferred because cord has a
tendency to cut into wire insulation. Use cotton, linen, nylon, or glass fiber cord or tape, according to the
temperature requirements. Cotton or linen cord or tape must be prewaxed to make it moisture and fungus
resistant. Nylon cord or tape may be waxed or unwaxed; glass fiber cord or tape is usually not waxed.
The amount of flat tape or cord required to single lace a group of conductors is about two and one-
half times the length of the longest conductor in the group. Twice this amount is required if the
conductors are to be double laced.
Before lacing, lay the conductors out straight and parallel to each other. Do not twist them together
because twisting makes conductor lacing and wire tracing difficult during troubleshooting.