Appendix 1 Lightning And Surge Protection - Dahua TPC-KF2241-T Quick Start Manual

Appendix 1 Lightning and Surge Protection

The Camera adopts TVS lightning protection technology. It can effectively prevent damage from
various pulse signals below 6000 V, such as a sudden lightning and surge. However, you still need to
take necessary precaution measures in accordance with your local electrical safety code when
installing the Camera in outdoor environment.
● The distance between the signal transmission cable and high-voltage device (or high-voltage
cable) shall be at least 50 m.
● Outdoor cable layout shall go under the penthouse if possible.
● For vast land, use sealing steel tube under the land to implement cable layout and make sure
that both ends of the tube are equipotentially grounded. Open floor cable layout is forbidden.
● For vast land, install a 10 KA lightning rod near the Camera's power input port and Ethernet port.
For Camera with AC to DC power adapter, install a 10 KA lightning rod near the output port of
the adapter.
● For Camera installed on iron tower, if there is a high-performance grounding bar on the tower,
connect the Camera grounding wire to the bar. If there is no grounding bar, use multiple copper
cable whose cross-sectional area are not less than 16 mm² to connect the Camera grounding wire
into the ground.
● Make sure that the Camera is over 3 m away from the top point of tower lightning rod and within
protection area against direct lightning.
● In area of strong thunderstorm or near high sensitive voltage (such as near high-voltage
transformer substation), install additional high-power thunder protection device or lightning rod.
● The thunder protection and earth grounding of the outdoor devices and cables shall be
considered based on the whole thunder protection of the building and conform to your local or
industry standards.
● The system shall adopt equal-potential wiring. The grounding devices shall meet anti-jamming
requirements and at the same time conforms to your local electrical safety code.
● The grounding devices shall not be connected to N (neutral) line of high voltage power grid or
mixed with other wires. When you connect the system to the ground alone, the grounding
resistance shall not be more than 4Ω and the cross-sectional area of grounding cable shall be no
less than 25 mm².
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