Videoswitch CMOR Vi-D5000 Dome - Manual (Page 34)

Vi-D5000 IR Dome
Videoswitch Page 29 VD601A.DOC
5 Appendices
5.1 Anti-lightning, Anti-surge
This product is protected against air discharge and lightning with TVS tube technology which can effectively
prevent the transient lightning below 3000V surge voltage and damage caused by other types of pulse signals.
However, necessary protective measures should be made in the premise of ensuring electrical safety for
outdoor installation according to the actual situation :
• Signal transmission line must be at least 50 meters far away from the high-voltage equipment or high
voltage cable.
• Try to choose outdoor wiring laid down along the roof line.
• Way of sealed steel pipe buried wiring is used in the area which opened, and steel pipe units grounded
in one point. Overhead wiring is absolutely prohibited.
• In the strong thunderstorms area or areas with high induced voltage (such as high voltage
substations), measure of installation of additional high power lightning protection equipment and
lightning rod must be taken.
• Lightning protection and grounding of outdoor devices and lines must take the lightning-protection
requirements of buildings into consideration, and comply with the related national standards and
industry standards.
• System must be equi-potential grounding. Grounding device must meet dual requirements of
anti-interference and electrical safety, and should not be shorted or mixed with the adjacent lines in the
strong power grid. When system is independently grounded, grounding impedance should be less
than 4Ω, and cross-sectional area of grounding conductor must be not less than 2.5mm
2 .
Fig 25