Skystream Owner’s Manual
3-CMLT-1054 Rev O XCO 1191
Pg. 50
Table 3 - Lightning Protection Efficiency for 60 ft (18 m) Towers
Isolated Flat Land
Hill or Knoll
Non-Isolated Flat Land
Ng
efficiency
efficiency
efficiency
Nc =
1/100
Nc =
1/1000
Nc =
1/10000
Nc =
1/100
Nc =
1/1000
Nc =
1/10000
Nc =
1/100
Nc =
1/1000
Nc =
1/10000
0.01
0.001
0.0001
0.01
0.001
0.0001
0.01
0.001
0.0001
1
0.143
0.914
0.991
0.572
0.957
0.996
-0.714
0.829
0.983
2
0.572
0.957
0.996
0.786
0.979
0.998
0.143
0.914
0.991
3
0.714
0.971
0.997
0.857
0.986
0.999
0.429
0.943
0.994
4
0.786
0.979
0.998
0.893
0.989
0.999
0.572
0.957
0.996
5
0.829
0.983
0.998
0.914
0.991
0.999
0.657
0.966
0.997
6
0.857
0.986
0.999
0.929
0.993
0.999
0.714
0.971
0.997
7
0.878
0.988
0.999
0.939
0.994
0.999
0.755
0.976
0.998
8
0.893
0.989
0.999
0.946
0.995
0.999
0.786
0.979
0.998
9
0.905
0.990
0.999
0.952
0.995
1.000
0.810
0.981
0.998
10
0.914
0.991
0.999
0.957
0.996
1.000
0.829
0.983
0.998
11
0.922
0.992
0.999
0.961
0.996
1.000
0.844
0.984
0.998
12
0.929
0.993
0.999
0.964
0.996
1.000
0.857
0.986
0.999
13
0.934
0.993
0.999
0.967
0.997
1.000
0.868
0.987
0.999
14
0.939
0.994
0.999
0.969
0.997
1.000
0.878
0.988
0.999
15
0.943
0.994
0.999
0.971
0.997
1.000
0.886
0.989
0.999
16
0.946
0.995
0.999
0.973
0.997
1.000
0.893
0.989
0.999
17
0.950
0.995
0.999
0.975
0.997
1.000
0.899
0.990
0.999
18
0.952
0.995
1.000
0.976
0.998
1.000
0.905
0.990
0.999
19
0.955
0.995
1.000
0.977
0.998
1.000
0.910
0.991
0.999
20
0.957
0.996
1.000
0.979
0.998
1.000
0.914
0.991
0.999
30
0.971
0.997
1.000
0.986
0.999
1.000
0.943
0.994
0.999
40
0.979
0.998
1.000
0.989
0.999
1.000
0.957
0.996
1.000
50
0.983
0.998
1.000
0.991
0.999
1.000
0.966
0.997
1.000
60
0.986
0.999
1.000
0.993
0.999
1.000
0.971
0.997
1.000
70
0.988
0.999
1.000
0.994
0.999
1.000
0.976
0.998
1.000
The Lightning Protection System Efficiency (E)
Using the appropriate Efficiency Table for the tower height, select the sub-column corresponding to the
installation topography
– Isolated Flat Land, Hill or Knoll, or Non-isolated Flat Land.
The data cell at the intersection of Flash Density value (Ng) row and the Permitted Number of Critical
Events (Nc) column will indicate The Lightning System Effic
iency “E”. If E is negative, no lightning
protection is required.
IMPORTANT:
If “E” is negative, no lightning protection is required.
Содержание Skystream 3.7
Страница 37: ...Skystream Owner s Manual 3 CMLT 1054 Rev O XCO 1191 Pg 37 SKYSTREAM 3 7 Appendix B Tower Grounding...
Страница 44: ...Skystream Owner s Manual 3 CMLT 1054 Rev O XCO 1191 Pg 44 Figure 4 Concrete Encased Electrode...
Страница 45: ...Skystream Owner s Manual 3 CMLT 1054 Rev O XCO 1191 Pg 45 SKYSTREAM 3 7 Appendix C LIGHTNING PROTECTION...
Страница 53: ...Skystream Owner s Manual 3 CMLT 1054 Rev O XCO 1191 Pg 53 SKYSTREAM 3 7 Appendix D CERTIFICATION COMPLIANCE...
Страница 55: ...Skystream Owner s Manual 3 CMLT 1054 Rev O XCO 1191 Pg 55 2 CE Declaration of Conformity Europe...
