CS11 Service
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 qualified arborist to
determine whet
her 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-
clearance arborist trainees shall be under the direct
supervision of qualified line-clearance arborist.
A second qualified line-clearance arborists or line-
clearance 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 meters)
to any energized electrical conductor in excess of 750
volts (primary conductor) or when:
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 apply
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
distances from energized electrical conductors in
accordance with Table 1.
All other arborists shall maintain a minimum approach
distance from energized electrical conductors in
accordance 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 qualified line-clearance arborists
and qualified 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
