Stanley CS05 - Electrical Precautions

CS05/CS06 User Manual ◄ 7
ELECTRICAL PRECAUTIONS
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 qualied arborist to
determine whether an electrical hazard exists before
climbing, or otherwise entering, or performing work in
or on a tree.
Only qualied line-clearance arborists or qualied line-
clearance arborist trainees shall be assigned to work
where an electrical hazard exists. Qualied line-clear-
ance arborist trainees shall be under the direct supervi-
sion of qualied line-clearance arborist.
A second qualied 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 sufciently
clear electrical conductors, so as to avoid con-
tact.
2. Roping is required to remove branches or limbs
from such electrical conductors. This does not
apply to individuals working on behalf of, or em-
ployed by, electrical system owners/operators
engaged in line-clearing operations incidental to
their normal occupation.
Qualied line-clearance arborists and line-clearance
arborist trainees shall maintain minimum approach
distances from energized electrical conductors in ac-
cordance with Table 1.
All other arborists shall maintain a minimum ap-
proach distance from energized electrical conductors
in accordance with Table 2.
Branches hanging on an energized electrical con-
ductor shall be removed using non-conductive equip-
ment.
Table 1 – Minimum approach distances from energized conductors for qualied line-clearance arborists and
qualied 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.