Figure 4-67. - Adjusting sag.
TARGETS. - The target-sighting method is a simple and accurate means for measuring sag. The desired sag is first determined from table 4-2.
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."
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 commonly used.
Figure 4-68. - Tying in conductors.Continue Reading