Electrical Hazards - Stanley CS25 User Manual

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 qualified arborist to
determine whether an electrical hazard exists before
climbing, or otherwise entering, or performing work in
or on a tree.
Only qualified line-clearance arborists or qualified line-
clearance arborist trainees shall be assigned to work
where an electrical hazard exists. Qualified line-clear-
ance arborist trainees shall be under the direct supervi-
sion of qualified line-clearance arborist.
A second qualified 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:
Table 1 – Minimum approach distances from energized conductors for qualified line-clearance arborists
and qualified line- clearance arborist trainees.
Includes 1910.269 elevation
Nominal Voltage
factor, sea level to 5000 ft
(kV phase-to-
phase)
0.05 to 1.0
1.1 to 15.0 2–04
15.1 to 36.0 2–09
36.1 to 46.0 3–00
46.1 to 72.5 3–09
72.6 to 121.0 4–06
138.0 to 145.0 5–02
161.0 to 169.0 6–00
230.0 to 242.0
345.0 to 362.0 13–02
500.0 to 550.0 19–00
765.0 to 800.0 27–04

ELECTRICAL HAZARDS

1)
ft-in m
Avoid contact
0.71
0.84
0.92
1.14
1.37
1.58
1.83
7–11 2.41
4.02
5.80
8.34
1) Exceeds phase-to-ground; elevation factor per 29 CFR 1910.269.
1. Branches or limbs being removed cannot first be
cut (with a pole pruner/pole saw) to sufficiently 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.
Qualified 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.
Includes 1910.269 elevation
factor, 5001 – 10,000 ft
1)
ft-in m
Avoid contact
2–08 0.81
3–02 0.97
3–05 1.04
4–03 1.30
5–02 1.58
5–11 1.80
6–10 2.08
9–00 2.75
15–00 4.58
21–09 6.63
31–03 9.53
Includes 1910.269 elevation
factor, 10,000 – 14,000 ft
1)
ft-in m
Avoid contact
2–10 0.86
3–05 1.04
3–09 1.14
4–07 1.40
5–07 1.70
6–05 1.96
7–05 2.26
9–09 2.97
16–03 4.96
23–06 7.17
33–10 10.32
CS25/28 User Manual ◄ 7