User’s Manual
19
Lightning and Surge Protection
The System adopts TVS lightning protection technology. It can effectively prevent damages
from various pulse signals below 6000V, such as sudden and indirect lighting strike. But,
when installing the System in the outdoor environment, you still need to take necessary
precaution measures while maintaining your local electrical safety code.
The distance between the signal transmission cable and high-voltage device (or
high-voltage cable) shall be at least 50 meters.
Outdoor cable layout should go under the penthouse if possible.
For open field, please use sealing steel tube under the land to implement cable layout
and make sure that each end of the steel tube are grounded in an equipotential way. It is
absolutely forbidden to set the cable overhead.
In area of strong thunderstorm hit or near high sensitive voltage (such as near
high-voltage transformer substation), additional high-power thunder protection device or
lightning rod should be installed.
The thunder protection and earth grounding of the outdoor device and cable, shall be
considered based on the whole thunder protection of the building and conform to your
local or industry standard.
Equal-potential wiring should be adopted in the 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 connected to the ground alone, grounding
resistance of the system shall not be more than 4Ω. And cross-sectional area of
grounding cable shall be no less than 25 mm
2
.
Appendix Figure 1-1
Lightning protection
