Figure 4-20. - Line hardware.
One brace extends to each side of the arm. Angle-iron braces are made in one piece and bent into the shape of a V, as shown in figure 4-18. These braces are fitted to the bottom of the crossarm instead of the side as is the flat type. Figure 4-19 gives an example of how these braces are used.
Line hardware consists of the miscellaneous bolts, nuts, braces, and clamps used to fasten crossarms, guys, and other equipment to the pole. Figure 4-20 shows some samples of common hardware used in power distribution.
An insulator is a material that prevents the flow of an electric current and can be used to support electrical conductors. The function of an insulator is to separate the line conductors from the pole. Insulators are fabricated from porcelain, glass, and fiber glass, treated with epoxy resins and rubberlike compounds. In determining the size and type you need, you should consider the designed voltage of the circuit, conductor size, length of the pole-line spans, and cost of the various insulators. The most common types of insulators found in Navy use are the pin, post, suspension, and strain insulators.Continue Reading