Lightning protection design plan  (1) Direct lightning protection design  General lightning rods that can protect the camera should be installed on the top of the outdoor camera support pole , and the corresponding grounding network should be grounded (the grounding resistance is required to be less than 10 ohms); there should be anti-direct strikes in the monitoring building Lightning protection (belt, needle, tower) device for thunder.   (2) Inductive lightning protection design 1. Camera lightning protection:   ( 1) Install a lightning protection device (surge protector abbreviated as SPD, commonly known as lightning arrester) on the power line of the camera side as the lightning protection of the camera power supply.   ( 2) Install a video SPD on the video signal line of the camera end as a lightning protection for the video signal of the camera.   ( 3) Install a control line lightning protection device signal SPD at the camera end with a pan/tilt as a lightning protection for the control line of the camera pan/tilt. 2. Controller lightning protection:   ( 1) Install the corresponding interface video SPD video SPD in front of the monitor in the indoor monitoring room.   ( 2) Install the corresponding control line lightning protection device signal SPD in the indoor monitoring room. 3, control building mine:   ( 1) the total power at the mounting Ⅰ level test of surge protector as the first stage of protection.   ( 2) is mounted on the front floor distribution box Ⅱ level testing of surge protector as a second-level protection.   ( 3) Install the corresponding

level testing of surge protector as a third-level protection (particularly apparatus should be selected according to circumstances).    ( 4) Install video lightning protection device before receiving and sending equipment. 4. Lightning protection for microwave transmitting antenna:    ( 1) Install a lightning rod at the microwave transmitting antenna.   ( 2) Install the antenna-fed lightning protection device corresponding to the interface before the microwave receiver and transmitter.    (3) Grounding system 1. Equipotential treatment and shielding   Connect the working ground (AC and DC working ground), equipment protection ground, and lightning protection ground Together, the common grounding method is adopted , and the grounding resistance is R≤ 1 Ω . Set up total equipotential connection , and shield all communication cables and cables entering the building with metal pipes, and make all metal pipes (including water pipes, gas pipes and various shielded pipes) enter the building as total equipotential Connect . Its purpose is to eliminate the potential difference between local networks and ensure that the equipment is not damaged by the lightning counterattack. 2, artificial ground grid design  to design around the building network, network digging depth of 600 to 800, a width of not less than 500, the grounding resistance is R≤ . 1 [Omega], vertical ground using L50 × W50 × H2000 hot galvanized angle , The horizontal grounding body adopts -50×5 hot-dip galvanized flat steel, the vertical grounding body and the horizontal grounding body are connected by double-sided welding, the horizontal grounding body and the horizontal grounding body are connected by double-sided welding, and the welding length is not less than 2D, Brush red lead or bituminous oil for anticorrosion treatment at the welding place. The grounding wire is made of 50×5 hot-dip galvanized flat steel, and the grounding test point is reserved through the copper-iron conversion head. (Unit is mm)