Thunder-Proof Cable Connection - Dahua D-SD59225DB-HC Installation Manual

2.2.2 Thunder-Proof Cable Connection

The following installation figures are for reference only, and the operation might be different
depending on the products. This chapter uses PTZ camera as an example.
2.2.2.1 Outdoor
Transient voltage suppressor (TVS) is applied to protect the Device against voltage spikes and
overvoltage below 6000V. However, it is still necessary to do operations to protect the Device
according to actual conditions.
The signal transmission cable must stay at least 50 m away from high voltage devices and high
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voltage wires.
When laying cables outdoors, try to lay them under the eaves.
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At open places, lay cables underground by means of hermetic steel tube, and then do
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equipotential grounding to both ends of steel tubes. Laying overhead power cables are
prohibited.
At places with severe thunderstorms and induced voltage (like substation), you need to prepare
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high-powered lightning protection devices and lightning conductors.
When laying cables and connecting lightning protection devices, you must comply with
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regional laws and regulations.
You must do equipotential grounding to the electric system. The grounding device must meet
●
the requirements of anti-jamming and conform 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
2
mm .
Figure 2-2 Installing lightning protection devices outdoors (1)
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