When installing outdoor cameras, it is essential to equip them with a lightning rod and use an independent grounding system to isolate power and signal lines, preventing interference and potential damage. The lightning rod should be positioned higher than the camera, covering a safe area within a 45-60 degree cone from its tip. It's important to ensure the lightning rod is insulated from the metal structure supporting the camera to avoid electrical risks. Proper grounding of front-end camera equipment is crucial. All grounding should be connected to a central grounding bus at the terminal end to maintain a consistent ground potential across the system. Without this, potential differences in the grounding loop could lead to equipment failure or even fires. For indoor cameras, grounding should connect to the shared terminal’s grounding point. Install a non-fuse circuit breaker and a leakage protection switch with appropriate capacity at the power supply end. Additionally, a surge protector capable of withstanding up to 3000KV (if budget allows) should be installed to protect against both induced and conducted lightning strikes. After grounding outdoor cameras, the resistance should be tested and kept below 10Ω. The grounding rod installation must meet standard three-point impedance testing requirements for optimal performance. In security monitoring systems, lightning protection measures at the monitoring end must be carefully planned. Consider all possible lightning intrusion paths, ground loop potential differences, and power surges when designing the system. The lightning protection system, grounding grid, and grounding terminals should be installed within the building housing the monitoring equipment. All metal piping connected to the monitoring terminal must be grounded and linked to the grounding device. When cables enter the terminal room, the metallic sheath of the cable and any self-supporting steel components should be connected to the grounding terminal. Indoor transmission cables and their grounding should be well-established. The grounding resistance must be less than 10Ω, but the lower the resistance, the better for safety and performance. These are the fundamental methods for grounding and lightning protection in a monitoring system. While they may not meet the strictest national standards, careful attention to these details during installation can significantly enhance the system’s reliability and safety.
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