Greenlee ES20LXR Manual De Instrucciones página 17

*These tables and figures
are meant to provide
guidance on operating
distances and are not
a substitute for proper
training or employer
safety policies in high
voltage working zones.
52093315 REV 0
Table 3: AC Live-Work Minimum Approach Distance
(See NESC Rule 441 in its entirety for more details)
Phase-to-
Phase-to-Ground
Phase(kV)
Min Max (m)
0 0.050 Not specified
0.051 0.300 Avoid contact
0.301 0.750 0.32
0.751 15.0 0.64
15.1 36.0 0.73
36.1 46.0 0.79
46.1 72.5 0.89
Distance to Employee from Energized Part*
Phase-to-
Without Tools
Phase (kV)
Phase-to-Ground
Max Min (m)
72.6 121.0 0.94
121.1 145.0 1.07
145.1 169.0 1.20
169.1 242.0 1.58
242.1 362.0 2.56
362.1 550.0 3.38
550.1 800.0 4.54
*Distances listed are for standard atmospheric conditions. The data used to formulate
this table was obtained from test data taken with standard atmospheric conditions.
Standard atmospheric conditions are defined as temperatures above freezing, wind less
than 15 mi/hr or 24 km/hr, unsaturated air, normal barometer, uncontaminated air, and
clean and dry insulators. If standard atmospheric conditions do not exist, extra care must
be taken.
For single-phase systems, use the highest voltage available.
For single-phase lines off three phase systems, use the phase-to-phase voltage of the system
Inadvertent movement factors used in these tables are as follows:
0.301 kV to 0.750 kV= 1 ft
0.751 kV to 72.5 kV= 2 ft
72.6 kV to 800 kV = 1 ft
For voltages above 72.5 kV, distances are based on altitudes below 900 m (3000 ft) above
sea level. For altitudes above 900 m (3000 ft), Rule 441A6 applies.
Distances were calculated using the following TOV values:
72.6 kV to 362 kV = 3 .0
362.1 kV to 550 kV = 2.4
550.1 kV to 800 kV= 2.0
For bare hand work where the employee is at line potential, this distance is to an object at a
different potential.
Distances for live-line tools in the air gap were calculated by adding a tool factor to the electri-
cal component (IEEE 516 C2 1.1 tool factor).
With tools means a live-line tool bridging the air gap to the employee from the energized part.
+
Phase-to-phase live-line in the air gap values are not available. If this situation exists, an
engineering evaluation should be performed.
© 2022 Greenlee Tools, Inc.
Distance to Employee*
Phase-to-Phase
(ft-in) (m)
Not specified
Avoid contact
1-1
2-2 0.67
2-5 0.87
2-7 0.94
2-11 1.15
With Tools
Phase-to-Ground Phase-to-Phase
(ft-in) (m) (ft-in)
3-1 1.01 3-4
3-7 1.15 3-10
4-0 1.29 4-3
5-2 1.71 5-8
8-5 2.75 9-1
11-1 3.61 11-11
14-11 4.82 15-10
+
(ft-in)
2-3
2-10
3-1
3-9
With Tools
(m) (ft-in)
1.37 4-7
1.62 5-4
1.88 6-3
2.77 9-2
4.32 14-3
6.01 19-2
8.87 29-2
ES20LXR
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