Figure 4-56. - Poles facing in a straight line.
facing in opposite directions, as shown in figure 4-56. This procedure, called facing "gain to gain" or "back to back," provides for maximum strength in the line.
Poles are always faced in the direction of hills, curves, and dead ends, as shown in figure 4-57. This is done to allow the most strain to be placed on the face and against the curve of the poles.
After the pole has been faced, it must be plumbed vertical. This is done by four pikers on four sides of the pole, acting on signals given by one crew member who sights along the line and another who sights from one side. In some cases, a small amount of rake or lean (approximately 12 inches) is left to allow for a wire strain or the normal give of a guy.
WARNING As a pole is being raised, it is safest to assume that at any moment something may slip or break Stand as far away from the pole as possible if you are not in the raising crew.
Figure 4-57. - Pole facing.
After the pole has been plumbed, the hole is backfilled and the backfill tamped down firmly. Backfilling is done gradually, in shallow layers, with each layer thoroughly tamped down. Usually two or three crew members tamp, and one shovels. When the hole has been filled to the ground line with tamped backfill, the remaining excavated soil is banked in a mound around the base of the pole to allow for subsequent settling (fig. 4-58).
The pike-pole method of setting poles should not be used unless there are enough crew members to do the work safely. In using pikes the crew must stand far enough apart so that they will not interfere with each other. Never brace a pike pole on your stomach. If the pole should happen to shift your way, you would not be able to get clear. Unmanned pikes alone should not be relied upon to support a pole, while a crew member is on it. Pike-pole tops should be kept covered at all times except when actually in use.
Crew members should not be on poles, while they are being plumbed, canted, or tamped.
Guys are assembled using seven-strand galvanized steel guy wire, a strain insulator (of a different design from and not to be confused with the strain insulator used for dead ending a conductor), and three bolt clamps or preformed guy grips. The dimensioning of the guy is determined by the height of the pole, by the amount of strain to be counteracted, and by the climate when the guy is installed. Figure 4-59 shows a typical guy and the method of attaching the come-along for tensioning the guy.
As previously discussed in this chapter, crossarms come in various sizes and types, depending on the type of system, size and number of conductors, and voltage of the system.Continue Reading