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CS25/28 User Manual ◄ 7
The following guidelines must be followed to prevent
accidental contact with overhead electrical conductors
and/or communication wires and cables. (Ref. ANSI
Z133.1-2000)
WORKING IN PROXIMITY TO ELECTRICAL
HAZARDS
An inspection shall be made by a qualied arborist to
determine whether an electrical hazard exists before
climbing, or otherwise entering, or performing work in
or on a tree.
Only qualied line-clearance arborists or qualied line-
clearance arborist trainees shall be assigned to work
where an electrical hazard exists. Qualied line-clear-
ance arborist trainees shall be under the direct supervi-
sion of qualied line-clearance arborist.
A second qualied line-clearance arborists or line-clear-
ance arborist trainees shall be within vision or voice
communication during line-clearing operations aloft
when line-clearance arborists or line-clearance arborist
trainees must approach closer than 10 feet (3.05 me-
ters) to any energized electrical conductor in excess of
750 volts (primary conductor) or when:
1. Branches or limbs being removed cannot rst be
cut (with a pole pruner/pole saw) to sufciently clear
electrical conductors, so as to avoid contact.
2. Roping is required to remove branches or limbs
from such electrical conductors. This does not ap-
ply to individuals working on behalf of, or employed
by, electrical system owners/operators engaged in
line-clearing operations incidental to their normal
occupation.
Qualied line-clearance arborists and line-clearance
arborist trainees shall maintain minimum approach dis-
tances from energized electrical conductors in accor-
dance with Table 1.
All other arborists shall maintain a minimum approach
distance from energized electrical conductors in accor-
dance with Table 2.
Branches hanging on an energized electrical conductor
shall be removed using non-conductive equipment.
Table 1 – Minimum approach distances from energized conductors for qualied line-clearance arborists
and qualied line- clearance arborist trainees.
Nominal Voltage
(kV phase-to-
phase)
Includes 1910.269 elevation
factor, sea level to 5000 ft
1)
Includes 1910.269 elevation
factor, 5001 – 10,000 ft
1)
Includes 1910.269 elevation
factor, 10,000 – 14,000 ft
1)
ft-in m ft-in m ft-in m
0.05 to 1.0 Avoid contact Avoid contact Avoid contact
1.1 to 15.0 2–04 0.71 2–08 0.81 2–10 0.86
15.1 to 36.0 2–09 0.84 3–02 0.97 3–05 1.04
36.1 to 46.0 3–00 0.92 3–05 1.04 3–09 1.14
46.1 to 72.5 3–09 1.14 4–03 1.30 4–07 1.40
72.6 to 121.0 4–06 1.37 5–02 1.58 5–07 1.70
138.0 to 145.0 5–02 1.58 5–11 1.80 6–05 1.96
161.0 to 169.0 6–00 1.83 6–10 2.08 7–05 2.26
230.0 to 242.0 7–11 2.41 9–00 2.75 9–09 2.97
345.0 to 362.0 13–02 4.02 15–00 4.58 16–03 4.96
500.0 to 550.0 19–00 5.80 21–09 6.63 23–06 7.17
765.0 to 800.0 27–04 8.34 31–03 9.53 33–10 10.32
1) Exceeds phase-to-ground; elevation factor per 29 CFR 1910.269.
ELECTRICAL HAZARDS