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Appendix 1
Transient voltage suppressor (TVS) is applied to protect the Camera against voltage spikes and
overvoltage below 2 KV (cable to ground) and 1 KV (cable to cable). However, it is still necessary to
do operations to protect the Camera depending on local electrical safety regulations.
The signal transmission cable must stay at least 50 m away from high voltage devices and high
voltage wire.
When laying cables outdoors, try to lay them under the eaves.
At open places, lay cables underground by means of hermetic steel tube, and then do
equipotential grounding to both ends of steel tubes. Laying overhead power cables is
prohibited.
At places with severe thunderstorms and induced voltage (like substation), you need to prepare
high-powered lightning protection devices and lightning conductors.
The thunder protection and earth grounding of the outdoor devices and cables shall be
considered based on the whole thunder protection of the building and conform to local or
industry standards.
You must do equipotential grounding to the electric system. The grounding device must meet
the demand of anti-jamming and also conforms to your local electrical safety code. The
grounding device shall not form short circuit to N (neutral) line of high voltage power grid or be
mixed with other wires. When the electrical system is connected to the ground cable, the
impedance cannot exceed 4Ω, and the cross-sectional area of the earth lead cannot exceed 25
mm
2
.
For the installation of lightning protection devices outdoors, see Appendix Figure 1-1.
Appendix Figure 1-1 Install lightning protection devices outdoors (1)
Thunder-Poof and Surge Protection
26
Quick Start Guide
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