5
Protection Radius
Additional Levels
Level 1+:
The ESE system at level of protection
1 is additionally connected to the
metal structure or reinforced bars
of the buildings used as natural
downconductors in addition to the
dedicated downconductors included
in the ESE system. Connection to
the natural downconductors shall be
made at roof level and ground level.
Level 1++:
The roof is protected at level 1+ with
an ESE having a radius of protection
reduced by 40% compared to achieve
a complete protection of equipments
on the roof against direct lightning
strikes.
Protection Performance
Protection Areas
H(m)
TSP-20
(Rp)
TSP-30
(Rp)
TSP-40
(Rp)
TSP-50
(Rp)
TSP-60
(Rp)
Level I
2
16
20
25
30
32
3
24
30
37
44
48
4
31
40
50
59
63
5
39
50
62
73
79
6
40
50
62
74
79
8
40
51
63
74
79
10
41
51
63
74
80
Level II
2
18
23
28
32
35
3
27
35
42
48
52
4
36
47
55
64
70
5
45
58
69
80
87
6
47
58
69
80
87
8
47
59
70
81
88
10
48
60
71
81
88
Level III
2
22
27
32
37
39
3
33
40
48
56
59
4
43
53
64
74
78
5
54
66
80
92
97
6
54
66
80
92
98
8
56
68
81
93
99
10
57
69
82
94
99
Level IV
2
25
30
36
41
43
3
37
45
53
61
64
4
49
59
71
81
86
5
61
74
88
101
107
6
62
74
89
102
107
8
63
76
90
103
108
10
65
77
91
104
109
The standard protection radius R
p
of the TerraStreamer
®
is linked (according to
NF C 17-102 standard) to
Δ
T, to the protection levels I, II, III, or IV and to the
height of the TerraStreamer
®
above the protected structure (H, defined by NF C
17-102 as a minimum of 2 m). The NF C 17-102 standard includes four levels of
protection.
Upward Streamer
TerraStreamer
®
Rp
h
