![Sigmasec PTZ-205AHD User Manual Download Page 33](http://html1.mh-extra.com/html/sigmasec/ptz-205ahd/ptz-205ahd_user-manual_1268105033.webp)
Page
33
This product USES the gas discharge tube of TVS diode and protec-
tion circuit, can effectively prevent the 3.0 kV following transient light-
ning and surge lamp all types of pulse signal to the damage of equipment.
But, for outdoor installation according to the actual situation on the prem-
ise of guarantee the electrical safety to do the necessary protective
measures:
●
Signal transmission line must be with the high voltage equipment goods
between high voltage cable to keep a distance of at least 50 meters
●
Choose as far as possible outside wiring along the roof line
For open field must adopt sealing pipe buried wiring way, and the steel
pipe by one-point earthing, absolutely forbidden by wiring overhead way
●
In strong thunderstorms or high induction voltage region (e.g., high
voltage transformer substation), must be taken to add extra high power
lightning protection equipment and installation of lightning rod and other
measures
●
Lightning protection and grounding design of outdoor installation and
wiring must be combined with the construction of lightning protection
requirements into consideration, and conform to the requirements of rele-
vant national standards and industry standards.
●
The system must be equipotential grounding. Grounding device must
meet the system anti-interference and electrical safety requirements, and
shall not be short term or mixed with strong power grid zero line. System
separate grounding, grounding resistance is not greater than 4
Ω.
APPENDIX: Lighting and surge protection
APPENDIX: Lighting and surge protection