BAREHAND MINIMUM DISTANCES
Voltage range
(a)
(b)
(phase-to-phase
Phase-to-ground
Phase-to-phase
kilovolts)
(fi-in) Meters
(fi-in) Meters
30.0- 35.0
2-4
0.7
2-4
0.7
35.1 - 46.0
2-6
0.8
2-6
0.8
46.1 - 72.5
3- 0
0.9
3-0
0.9
72.6- 121.0
3 -4
1.0
4-6
1.4
138.0 - 145.0
3 - 6
1.1
5 - 0
1.5
161.0 - 169.0
3 - 8
1.2
5 - 6
1.7
230.0 - 242.0
5 - 0
1.5
8 - 4
2.5
345.0 - 362.0
7 - 0
2.1
13 - 4
4.1
500.0 - 552.0
11 - 0
3.4
20 - 0
6.1
Note: These data are from table V-2 of 29 CFR 1926.955-OSHA; metric added.
4.1.11 Measuring Sticks. When the nature of the work requires that minimum
distances be approached, calibrated insulating measuring sticks shall be used to
verify the distances. Crews using the live-line barehand technique shall be equipped
with at least one short insulating telescoping measuring stick for use from support
platforms and at least one long insulating telescoping measuring stick for use from
the ground. A telescoping fiberglass measuring stick, alternately yellow (or white)
and red striped at 0.1-meter intervals, with every tenth (1 meter) stripe black, is
recommended for monitoring minimum distances.
distances be approached, calibrated insulating measuring sticks shall be used to
verify the distances. Crews using the live-line barehand technique shall be equipped
with at least one short insulating telescoping measuring stick for use from support
platforms and at least one long insulating telescoping measuring stick for use from
the ground. A telescoping fiberglass measuring stick, alternately yellow (or white)
and red striped at 0.1-meter intervals, with every tenth (1 meter) stripe black, is
recommended for monitoring minimum distances.
4.1.12 Wooden Structure Members. For circuits mounted on poles or attached to
wooden structures, all wood members shall be considered at ground potential.
wooden structures, all wood members shall be considered at ground potential.
4.1.13 Testing Insulators. Prior to replacement of broken or defective suspension-
type insulators by barehand methods, each insulator in the string shall be tested by
means of a meter-type insulator
type insulators by barehand methods, each insulator in the string shall be tested by
means of a meter-type insulator
tester mounted on a hot stick, started at the "hot
end" of the insulator string, with individual insulator meter readings recorded on a
graph. If the recorded meter reading indicates more than 20 percent of the insulators
have no insulation value, surge limiting devices must be properly installed prior to
barehand replacements or the insulators must be replaced by other than barehand
procedures. For work at the energized terminal end of an acceptable insulator string,
the aerial platform must be positioned so that no more than one insulator or 10
percent of the insulator string (whichever is greater) is shunted by the aerial
platform, including the workman's body and tools, with distances from grounded
parts and other phases not less than specified in
graph. If the recorded meter reading indicates more than 20 percent of the insulators
have no insulation value, surge limiting devices must be properly installed prior to
barehand replacements or the insulators must be replaced by other than barehand
procedures. For work at the energized terminal end of an acceptable insulator string,
the aerial platform must be positioned so that no more than one insulator or 10
percent of the insulator string (whichever is greater) is shunted by the aerial
platform, including the workman's body and tools, with distances from grounded
parts and other phases not less than specified in
insulator(s) in an insulator string containing insulators
11 (FIST 3 - 29 5/90)