The security room is typically located within Party A's building. The lightning protection and power supply system has been implemented to safeguard against electrical surges. The 220V AC power supply is considered safe, and according to the "Basic Design Points for Safe Electricity Supply," this setup is deemed sufficient.
However, lightning protection for the security system is a comprehensive project. Simply focusing on partial solutions—such as "lightning protection of the server room" or "equipotential bonding"—is not enough to fully protect the entire system. If the front camera poles are not properly protected or if numerous grounding devices are used, even an effective "airfield lightning protection" may fail to ensure the safety of the equipment.
The system employs single-point grounding, where the server room’s host chassis is grounded to safely discharge static electricity. This approach is sufficient for protecting against induced lightning, provided that line protection measures are in place.
**The Lightning Protection Concept for Security Projects**
1. The primary goal of lightning protection design in a security system must be to ensure the safety of both the equipment and its operation. This should be clearly outlined in industry standards. For direct lightning strikes, an independent lightning rod is essential. For induced lightning, proper line protection is key. Using pole-mounted lightning rods, grounding surge protectors, or similar devices for security systems is akin to planting a time bomb.
2. It's crucial to adopt the concept of "wide-area information system electromagnetic compatibility design." Single-point grounding is the fundamental element of lightning protection, as well as a key principle for interference prevention and overall system safety in security projects.
3. When implementing security and lightning protection measures, it's important to understand basic lightning strike probabilities. This helps reduce the blind spots in design and investment, ensuring that the project is both safe and effective. For example, a small outdoor camera pole measuring 3–5 meters in height in northern regions has a lightning strike probability of less than 0.01 times per year—essentially a "once-in-a-century" event. Should such a pole require full direct lightning protection? Some consultants may insist on it, urging the purchase of expensive stainless steel lightning rods and professional grounding networks. Yet, for a simple 3–5 meter pole costing just a few hundred yuan, the cost of proper lightning protection could reach tens of thousands of yuan. This often reflects commercial interests, leading to unnecessary expenses and potentially compromising the system’s integrity. After all, the Three Gorges Project was designed with the safety of multiple provinces in mind, but not for a once-in-a-century event. Is it truly necessary for a security pole to follow the same extreme standard?
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