16
4 Appendix
Ⅰ
Lightening Protection and Surge Protection
This series speed dome adopts TVS lighting protection technology. It can effectively
prevent damages from various pulse signals below 6000W, 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 the outdoor
environment.
The distance between the signal transmission cable and high-voltage device (or
high-voltage cable) shall be at least 50 meters.
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 connects one point to the earth. Open floor cable layout is forbidden.
In area of strong thunderstorm hit or near high sensitive voltage (such as near high-
voltage transformer substation), you need to install additional high-power thunder
protection device or lightning rod.
The thunder protection and earth of the outdoor device and cable shall be
considered in the building whole thunder protection 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 conforms 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 connect the system to the earth alone, the earth
resistance shall not be more than 4
Ω
and earth cable cross-sectional area shall be
more than 25 mm
²
. See Figure 4-1.
Figure 4-1
