Dahua D-SD22204-GC-LB, Инструкция по эксплуатации

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Figure 2-3 Installing lightning protection devices outdoors (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 Device.
● H: The length of the lightning conductor.
To get the value of L1, you need to use the formula:
2.2.2.2 Indoor
You shall use multiple copper cables whose cross-sectional area is not less than 25 mm
2
to
connect the yellow-green grounding cable/grounding screws to the indoor equipotential
grounding terminals.