a.
A wire line crossing a road must have the proper clearance. Remember, it is 14 feet for a
secondary and 18 feet for a primary road. To attain this height, you have to lash two poles together.
When additional strength is required, two lance poles are lashed together at the base. Lash the poles
with field wire or marline cord, overlapping the poles at least 5 feet. This type of construction can
support up to 10 field wire lines for short spans such as road crossings.
b.
An aerial span supported by lance poles must be securely guyed. To erect and guy an
aerial span, proceed as follows:
(1)
Lash the lance poles together (see Figure 1-18) and lay the poles on the ground
parallel to the road.
(2)
Tie the wire line to the insulator on the lance pole (use clove hitch tie). Use a 4-
6-inch piece of tape to secure the wire to the insulator.
(3)
Tie one end of each guy wire near the top of the lance pole. (Field wire is suitable
for guy wires or marline cord may be used.)
(4)
Raise the lance poles and line into position.
(5)
Tie the guy wires at a 45-degree angle from the line to a secure object such as a
post, tree, or stake at a one to one ratio. That means for every 1 foot of height, you move the stake back
from the lance pole 1 foot at a 45-degree angle.
(6)
Tie the wire line to a stake at the bottom of the lance pole.
(7)
Tag the line approximately 6 inches behind the stake away from the road. You
don't want to lose the tag if you lose the wire because something happened to your lance poles. Leave
enough slack for reconstruction.
(8)
See Figure 1-19 for a properly constructed aerial span.
1-25
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