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," it meets the required standards.
Lightning protection for the security system is a comprehensive project. A fully integrated lightning protection design for the entire system is essential. Relying solely on partial measures such as "lightning protection of the equipment room" or "equipotential bonding" is insufficient to ensure the safety of the entire system. Even if the front camera poles are equipped with lightning protection, or if numerous grounding devices are used, a well-designed air termination system alone cannot guarantee the safety of the system’s equipment.
The system uses single-point grounding. The host chassis in the equipment room is grounded to safely discharge static electricity, and this approach is sufficient for protecting against induced lightning through proper line protection.
**Key Concepts of Lightning Protection in Security Projects**
1. The primary goal of lightning protection design for the security system must be to ensure the safety of the equipment and its operation. This principle should be clearly defined in industry standards. For direct lightning protection, an independent lightning rod should be used. For induced lightning, effective line protection is essential. Installing pole-mounted lightning rods, grounding surge protectors, or similar devices for security systems is like planting a time bomb, which can cause more harm than good.
2. It is important to adopt the concept of "wide-area information system electromagnetic compatibility design." Single-point grounding is the foundation of lightning protection, interference prevention, and overall system safety. It is a fundamental principle in the design of secure systems.
3. When implementing security and lightning protection, it is crucial to understand lightning strike probabilities. This helps reduce the blind spots in design and investment, preventing misleading practices that may lead to unnecessary costs. For example, a 3–5 meter high outdoor camera pole or a standalone house in northern regions has a lightning strike probability of less than 0.01 times per year — effectively a "once in a century" event. Should we then install expensive lightning protection for such low-risk scenarios? Some vendors may push for costly solutions, such as professional stainless steel lightning rods and extensive grounding networks, even for simple poles costing just a few hundred yuan. These measures could cost up to tens of thousands of yuan, which is not only excessive but also counterproductive. It's akin to being overcharged for a system that ends up failing due to poor design. Just as the Three Gorges Project was designed with the safety of multiple provinces in mind, not for a once-in-a-century event, so too should security systems avoid over-engineering based on unrealistic assumptions.
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