Figure 4-67.Adjusting sag.
Figure 4-66 shows the effect of temperature on the
sag in a 200-foot span of 00 wire. You target-measure
sag by nailing slat targets, such as a couple of pieces of
wood lath, at the point on each pole below the conductor
insulator that creates the desired amount of sag. A
lineman then sights from one slat to the other, and the
conductor is hauled up or lowered until its lowest point
is on the line of sight between the slats (fig. 4-67).
After the wires are "sagged in," you allow a rest
period of from 1/2 hour to 4 hours (varying according to
the length of the pull) to let the wires adjust themselves
to the tension in the pull. They will gradually "creep"
until tension in all the spans is equalized. After they
have crept to the final position, you are ready to "tie in."
TARGETS. The target-sighting method is a
simple and accurate means for measuring sag. The
TYING IN CONDUCTORS
Tie wire fastens the conductor and insulator
together. Conductors can be tied in various ways, but
the ties shown in figure 4-68 are the ones most
desired sag is first determined from table 4-2.
Figure 4-68.Tying in conductors.