Page 28 - Reliable_System_Solutions

Distance between Class of LPS I Class of LPS II Class of LPS III Class of LPS IV Height of the Class of Class of Class of Class of
air-termination radius 20 radius 30 radius 45 radius 60 air-termination LPS I Distance LPS II Distance LPS III Distance LPS IV Distance
rods in m sag in m sag in m sag in m sag in m rod h in m Angle α a in m Angle α a in m Angle α a in m Angle α a in m

1 0.01 0.00 0.00 0.00 1 71 2.90 74 3.49 77 4.33 79 5.14
2 0.03 0.02 0.01 0.01 2 71 5.81 74 6.97 77 8.66 79 10.29
3 0.06 0.04 0.03 0.02 3 66 6.74 71 8.71 74 10.46 76 12.03
4 0.10 0.07 0.04 0.03 4 62 7.52 68 9.90 72 12.31 74 13.95
5 0.16 0.10 0.07 0.05 5 59 8.32 65 10.72 70 13.74 72 15.39
6 0.23 0.15 0.10 0.08 6 56 8.90 62 11.28 68 14.85 71 17.43
7 0.31 0.20 0.14 0.10 7 53 9.29 60 12.12 66 15.72 69 18.24
8 0.40 0.27 0.18 0.13 8 50 9.53 58 12.80 64 16.40 68 19.80
9 0.51 0.34 0.23 0.17 9 48 10.00 56 13.34 62 16.93 66 20.21
10 0.64 0.42 0.28 0.21 10 45 10.00 54 13.76 61 18.04 65 21.45
11 0.77 0.51 0.34 0.25 11 43 10.26 52 14.08 59 18.31 64 22.55
12 0.92 0.61 0.40 0.30 12 40 10.07 50 14.30 58 19.20 62 22.57
13 1.09 0.71 0.47 0.35 13 38 10.16 49 14.95 57 20.02 61 23.45
14 1.27 0.83 0.55 0.41 14 36 10.17 47 15.01 55 19.99 60 24.25
15 1.46 0.95 0.63 0.47 15 34 10.12 45 15.00 54 20.65 59 24.96
16 1.67 1.09 0.72 0.54 16 32 10.00 44 15.45 53 21.23 58 25.61
17 1.90 1.23 0.81 0.61 17 30 9.81 42 15.31 51 20.99 57 26.18
18 2.14 1.38 0.91 0.68 18 27 9.17 40 15.10 50 21.45 56 26.69
19 2.40 1.54 1.01 0.76 19 25 8.86 39 15.39 49 21.86 55 27.13
20 2.68 1.72 1.13 0.84 20 23 8.49 37 15.07 48 22.21 54 27.53
21 2.98 1.90 1.24 0.93 21 36 15.26 47 22.52 53 27.87
22 3.30 2.09 1.37 1.02 22 35 15.40 46 22.78 52 28.16
23 3.64 2.29 1.49 1.11 23 36 16.71 47 24.66 53 30.52
24 4.00 2.50 1.63 1.21 24 32 15.00 44 23.18 50 28.60
25 4.39 2.73 1.77 1.32 25 30 14.43 43 23.31 49 28.76
26 4.80 2.96 1.92 1.43 26 29 14.41 41 22.60 49 29.91
27 5.24 3.21 2.07 1.54 27 27 13.76 40 22.66 48 29.99
28 5.72 3.47 2.23 1.68 28 26 13.66 39 22.67 47 30.03
ROLLING SPHERE
29 6.23 3.74 2.40 1.78 29 25 13.52 38 22.66 46 30.03
30 6.77 4.02 2.57 1.91 30 23 12.73 37 22.61 45 30.00
31 7.36 4.31 2.75 2.04 31 36 22.52 44 29.94
32 8.00 4.62 2.94 2.17 32 35 22.41 44 30.90
33 8.70 4.95 3.13 2.31 33 35 23.11 43 30.77
34 9.46 5.28 3.33 2.46 34 34 22.93 42 30.61
35 10.32 5.63 3.54 2.61 35 33 22.73 41 30.43
36 11.28 6.00 3.76 2.76 36 32 22.50 40 30.21 Table 2: Correlation of the height of the air-termination rod h to the protective angle α and distance a depending on the class of LPS
37 12.40 6.38 3.98 2.92 37 31 22.23 40 31.05
38 13.76 6.78 4.21 3.09 38 30 21.94 39 30.77
39 15.56 7.20 4.44 3.26 39 29 21.62 38 30.47
40 20.00 7.64 4.69 3.43 Table 3: Sag of the rolling sphere depending on the distance between two air-termination rods and the class of LPS 40 28 21.27 37 30.14
41 8.10 4.94 3.61 41 27 20.89 37 30.90
42 8.58 5.20 3.80 PROTECTIVE ANGLE 42 26 20.48 36 30.51
43 9.08 5.47 3.98 43 25 20.05 35 30.11
44 9.60 5.74 4.18 44 24 19.59 35 30.81
45 10.16 6.03 4.38 45 23 19.10 34 30.35
46 10.74 6.32 4.58 46 33 29.87
47 11.35 6.62 4.79 47 32 29.37
48 12.00 6.93 5.01 48 32 29.99
49 12.69 7.25 5.23 49 31 29.44
50 13.42 7.58 5.46 50 30 28.87
51 14.20 7.92 5.69 51 30 29.44
52 15.03 8.27 5.93 52 29 28.82
53 15.94 8.63 6.17 53 28 28.18
54 16.92 9.00 6.42 54 27 27.51
55 18.01 9.38 6.67 55 27 28.02
56 19.23 9.77 6.93 56 26 27.31
57 20.63 10.18 7.20 57 25 26.58
58 22.32 10.59 7.47 58 25 27.05
59 24.55 11.02 7.75 59 24 26.27
60 30.00 11.46 8.04 60 23 25.47
nd
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Values = Lightning Protection Guide 2 current edition Table 5.1.1.4 (page 55)