High Speed Dome Camera User’s Manual
- 45 -
1.000
18
19
0.7854
1.250
16
18
1.2266
1.500
15
1.7665
2.000
12
14
3.1420
2.500
4.9080
3.000
7.0683
Table 6
Appendix E 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:
Keep the communication cables at least 50 meters away from high voltage equipment or cables.
Make outdoor cable laying-out under eaves as possible as you can.
In open area shield cables in steel tube and conduct a single point ground to the tube. Trolley wire is forbidden in such
circumstances.
In strong thunderstorm or high faradic zone (such as high voltage transformer substation), extra strong lightning proof equipment
must be installed.
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.
The system must be grounded with equal potentials. The earth ground connection must satisfy the anti-interference and electrical
safety requirements and must not be short connected with high voltage electricity net. When the system is grounded separately,
the resistance of down conductor should be 4 and the sectional area of down conductor should be 25mm
2
(refer to Figure
E.1).
