Figure 4-60. - Crossarm, showing proper way to attach a handline.
On most pole-line construction, the installation of hardware and crossarms is accomplished on the ground before setting the pole. This is the easiest and most efficient method; however, sometimes it is necessary to upgrade or build on to an existing system, and then the arm must be installed on a pole that is already standing.
When the crossarm is mounted on the pole before the pole is set, the through bolt is tightened, but the crossarm braces are left hanging loose. Once the pole is set, the crossarm is leveled and the braces are secured to the pole. Finally, the through bolt is drawn completely tight.
When the crossarm is mounted after the pole is set, it is pulled up to a lineman in a working position by a helper on the ground, using a handline attached, as shown in figure 4-60. With the handline attached in this fashion, the lineman can, after he inserts the through bolt, cast off the upper half-hitch, and the helper on the ground can then heave the crossarm level.
Braces are usually fastened to a crossarm with 3/8-inch by 4-inch carriage bolts. Each brace comes down diagonally and is attached to the pole at the lower end with a 1/2-inch lag screw.
Figure 4-61. - Dead-end secondary rack.Continue Reading