Thunder-Proof and Surge Protection 15
Appendix table 1-1 Install PTZ lightning protection devices
No.
Description
1
Video lightning conductor.
2
Communication lightning conductor.
3
Power supply lighting conductor.
4
Impedance of the cable connected to the ground wire should
be less than 4
Ω.
5
The radius is 60 m.
6
Lightning conductor.
7
Steel tube.
Appendix figure 1-2 Install PTZ lightning protection devices (2)
R: The radius of the circle, and R=60 m;
L1: The length of the pole that holds the lightning conductor;
L2: The length of the rail that holds the PTZ;
H: The length of the lightning conductor.
To get the value of L1, you need to use the formula:
(√𝑅
2
– [R– (L1 + H)]
2
– L2)
2
+ (R– L1)
2
= R²
