Figure 4-25.—Post insulators for armless construction.
Suspension Insulator
In figure 4-26 you see the common suspension
insulator. The suspension insulator, as its name implies,
is suspended from the crossarm and has the line
conductor fastened to the lower end. It is designed for
ease of linking units together.
Linking of these
insulators gives you the versatility of ordering one
insulator to be used with varying voltages.
Strain Insulator
Figure 4-26.—Suspension insulator.
comers, at sharp curves, at extra long spans, at river
The strain insulator looks exactly like the
crossings, or in mountainous country. In such places the
suspension insulator but is designed to hold much
insulator must not only be a good insulator electrically
heavier physical loads. Strain insulators are used when
but it also must have sufficient mechanical strength to
a pull must be carried as well as insulation provided.
counterbalance the forces due to tension of the line
Such places occur whenever a line is dead-ended, at
conductors. (See fig. 4-27.)
Figure 4-27.—Strain insulator.
4-11
