Appendix
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: Lightning Proof and Surge Signal Proof
The product adopts TVS lightning proof technology to prevent from damage
by lightning strike below 1500 W and impulse signals such as surge; but it is
also necessary to abide by the following precautions to ensure electrical
safety based on practical circumstances:
1
Keep the communication cables at least 50 meters away from high
voltage equipment or cables.
2
Make outdoor cable laying-out under eaves as possible as you can.
3
In open area shield cables in steel tube and conduct a single point ground
to the tube. Trolley wire is forbidden in such circumstances.
4
In strong thunderstorm or high faradic zone (such as high voltage
transformer substation), extra strong lightning proof equipment must be
installed.
5
Take the building lightning proof requirements into account to design the
lightning proof and grounding of outdoor equipment and cable laying-out in
accordance with the national and industrial standards.
6
The system must be grounded with equal potentials. The earth ground
connection must satisfy the anti-interference and electrical safety require-
ments and must not short circuited with high voltage electricity net. When the
system is grounded separately, the resistance of down conductor should be
≤
4
Ω
and the sectional area of down conductor should be
≤
25mm
2
III. Appendix
9
Appendix
Figure 25
Video cable lighting conductor
Communication cable lighting conductor
Power cable lighting conductor
Lighting rod
45
°
The dome must be
installed within the 45
°
angle area under the
lighting rod with vertical
line as the bisector
The resistance of
down conductor
should be
≤
4
Ω
Shield Steel tube
