8
Appendix I Lightning and Surge
Outdoor Dome Camera need to consider lightening, anti-surge, on the premise of
ensuring electrical safety, may take the following measures
：
Signal transmission lines and high voltage equipment or high voltage cables must be
at least 50 meters distance between
；
Try to choose outdoor wiring along the eaves line
；
For open field must be sealed steel tubes buried cabling, grounding and steel pipe,
the absolute prohibition of the use of overhead wiring
；
In areas of severe thunderstorm or high-voltage area (such as high-voltage
substations), lightning protection equipment, as well as for additional installed power
must be taken measures such as installing lightning rods
Outdoor lightning protection and grounding design of devices and circuits must be
combined with building mine requires unified consideration and in accordance with
the requirements of the relevant national standards, industry standards
；
System must be equipotential earthing. Earthing system anti-interference must be met
and the dual requirements of electrical safety, and shall not be mixed with strong
power network neutral wire shorted or. Separately when grounding, grounding
impedance less than 4 ohms, ground wire cut-area must be not greater than 25mm2
lines shorted