TM 5-684/NAVFAC MO-200/AFJMA 32-1082
ON EACH END OF
HIGH -STRENGTH STRAND
Figure 4-22. Side anchor
Section XIV - TREE TRIMMING
4-53. Tree trimming objectives.
break wires, act as a conductor between wires, or
force wires together to cause a short circuit. Limbs
Too much tree trimming impacts on environmental
growing in contact with the wires provide a path for
needs. Too little tree trimming impacts on line clear-
current to flow to ground, especially when wet.
ance requirements. The objective is to strike an
Wires and limbs rubbing together in the wind cause
acceptable balance between the two, considering
holes to be worn in the insulation, increasing the
both cost and safety considerations.
possibility of service failure.
a. Environmental needs. Trees provide shade, re-
c. Requirement. Tree trimming must be done be-
duce glare, keep the air fresh by supplying oxygen
fore the trouble actually occurs. Although the rea-
and consuming carbon dioxide, filter wind and
son for trimming is to protect the distribution cir-
noise, and satisfy human needs for beauty. They can
cuits, the effect on the trees must not be overlooked.
also pose a hazard to electric service continuity in
Trees must be left in as sound of a condition and
electric line rights-of-way.
appearance as possible. If leaving the tree in rea-
b. Line clearance factors. The branches and limbs
sonable condition and appearance is incompatible
of trees growing near overhead lines are a potential
with necessary clearance, consideration should be
source of trouble and service interruption. Trees
given to either raising or rerouting the line, or re
near overhead lines may be broken off and blown
across the line wires during a storm. Limbs may
moving the tree. Lines should be checked and