Thunder-Proof and Surge Protection 15
Appendix table 1-1 Install PTZ lightning protection devices
Video lightning conductor.
Communication lightning conductor.
Power supply lighting conductor.
Impedance of the cable connected to the ground wire should
be less than 4Ω.
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:
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