Appendix 3 Statics, Interference Lightning and Surge Protection
This product adopts TVS plate lightning protection technology to avoid damage caused by pulse
signal that is below 3000V, like instantaneous lighting stroke, surging, etc. According to the actual
outdoor situation, necessary protection measures must be taken, besides ensuring the electrical
safety.
The distance between signal transmission wires and High-voltage equipment or high-voltage
cable is at least 50m.
Outdoor wiring should better be routed under eaves as much as possible.
In the open field, wiring should be buried underground in sealed steel pipe, and the steel-pipe
should be one-point grounding. Overhead routing method is forbidden.
In strong thunderstorm area or high induction voltage areas (such as high-voltage transformer
substation), high power lightning protection apparatus and lightning conductor are necessary to
be added.
The design of lightning protection and grounding of the outdoor devices and cables should be
considered together with the lightning protection demand of buildings. It also must conform to
the related national standards and industrial standards.
The system should be equipotential grounded. The grounding equipment must conform to the
demands of system anti-jamming and electrical safety both and it must not appear short circuit
or mixed circuit with the zero conductor of strong grid. When the system is grounded alone, the
resistance should be no more than 4Ω. The sectional area of the grounding cable should be no
less than 25mm2. For grounding instructions, please refer to the Installation Manual of Speed
Dome.
Lightening Rod
45°
The speed dome must be
installed in the 45° protection
area of the lightening rod.
The impedance of the grounding
wire can be no more than 4Ω.
Steel Protection Tube
Video Arrester
Communication
Arrester
Power Arrester
Figure A-1 Lightning & Surge Protection
Grounding for Cement Pole/Wall Installation:
When the speed dome is installed in environment where is relatively insulating to the earth, e.g.,
cement pole or cement wall, then only the control center requires proper grounded locally. Refer to
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