A special reminderWhen using an aluminum
conductor, you are required to cover it with armor rod at
each insulator to provide physical protection against
rubbing or pitting caused by the elements. Another
important requirement is the use of ACSR-rated dead-
end shoes, splice connectors, and all other devices that
come in direct contact with an aluminum conductor.
This is to prevent electrolysis that occurs from the
physical contact of dissimilar metals.
In tying in conductors, observe the following
Always use new, fully annealed wire for ties. Hard-
drawn wire is brittle and cannot be pulled up against the
conductor and insulator.
Use the proper size wire. For No. 8 bare, use No. 8
bare. For No. 6 or No. 4 bare, use No. 6 bare. Use No. 4
bare for a No. 2 conductor. Use No. 2 bare wire for No.
l/O through 4/0 bare conductor.
Use a piece of tie wire that is long enough to make
the complete tie, with enough left over to allow
grasping. After the tie is completed, cut off the excess
and form a loop, or eye, at the end of any projecting end
of the wire.
Make positive contact between the wire and
conductor to avoid chafing and to limit possibilities of
causing interference with radio communications. Hold
the tie wire tight against the insulator as you make your
wraps around the insulator and the conductor wire.
Grounding in the power distribution system is
important. The grounding system protects you and the
Figure 4-69.Pole with butt ground plate.
Figure 4-70.Pole butt ground, coiled wire type.
distribution system when faults occur and aids in the
suppression of noise.
Grounds are required every
quarter mile on a power distribution line and at every
pole when equipment, such as transformers, regulators,
capacitors, switches, circuit breakers, and lightning
arresters, is installed. The maximum resistance of any
distribution ground is 25 ohms, but a lower resistance is
In new construction a butt ground is placed on the
pole before the pole is installed. The butt ground can be
a manufactured plate, as shown in figure 4-69, or a coil
of bare copper wire, as shown in figure 4-70. On
existing distribution lines, a ground rod that is 5/8 inch
in diameter and 8 feet long is driven at the base of the
pole and tied to the pole with a bare copper grounding
conductor and a ground clamp, as shown in figure 4-71.
Figure 4-71.Pole ground, ground rod type.