Dahua Technology DH-IPC-HDEW Series Quick Start Manual page 35

No. Description
2 Communication lightning conductor.
3 Power supply lightning conductor.
4 Steel tube.
Explosion-proof camera: Must be installed in the arc formed by the 60-m circle,
5
the lightning conductor top and the ground.
Impedance of the cable connected to the grounding wire should be less than 4
6
Ω.
7 Lightning conductor.
8 The radius is 60 m.
Appendix Figure 1-2 Installing lightning protection devices outdoors (2)
R: The radius of the circle, and R=60 m.
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L1: The length of the pole that holds the lightning conductor.
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L2: The length of the rail that holds the Camera.
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H: The length of the lightning conductor.
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To get the value of L1, you need to use the formula:
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Quick Start Guide