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6 APPENDIX Ⅰ Ⅰ Ⅰ Ⅰ Surge Protection
This device uses TVS lighting protection technology. It can effectively prevent damages from
various pulse signals below 2000W, such as sudden lighting and surge. While maintaining
your local electrical safety code, you still need to take necessary precaution measures when
installing the speed dome in an outdoor environment.
The distance between the signal transmission cable and high-voltage device (or high-
voltage cable) shall be at least 50 meters (164 ft).
Outdoor cable layout shall go under the penthouse if possible.
For vast land, please use sealing steel tube under the land to implement cable layout
and connect one point to the earth. Open floor cable layout should not be used.
In areas prone to strong thunderstorms or near high sensitive voltage (such as near
high-voltage transformer substation), you need to install additional high-power
lightning protection device or lightning rod.
The lightning protection and earth of the outdoor device and cable shall be considered
under the lightning protection of the whole building and conform to your local national
or industry standard.
System shall adopt equal-potential wiring. The earth device shall meet anti-jamming
and at the same time conform to your local electrical safety code. The earth device shall
not short circuit to N (neutral) line of high voltage power grid or mixed with other wires.
When connecting the system to earth alone, the earth resistance shall not be more than
4Ω and earth cable cross-sectional area shall be below 25 mm^2
Figure 6-1
11
See Figure 6-1
.
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