What should be the maximum gap between the wires/metal members in case

What should be the maximum gap between the wires/metal members in case of fence for perimeter security to preclude the possibility of unfettered movement of objects to and from the facility?

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UPSC CISF-AC-EXE – 2021

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For perimeter security fencing, especially for critical infrastructure or high-security areas, the gap between vertical and horizontal members needs to be small enough to prevent a person from climbing through or passing objects through easily. While specific standards vary depending on the security level, a gap of 6 inches (approximately 15 cm) is a common and widely accepted maximum size for high-security fences like chain-link or welded mesh to effectively preclude the passage of a human body or significant objects. Larger gaps like 8″, 10″, or 12″ would compromise the effectiveness of the barrier.

Perimeter security fence design, including mesh size or gap between members, is critical to its effectiveness as a physical barrier against intrusion and passage of objects. Smaller gaps provide higher security.

Perimeter security fences are often part of a layered security system that includes detection systems (sensors), surveillance (CCTV), and response mechanisms. The physical barrier’s effectiveness is measured by its ability to delay or prevent penetration. Standards from organizations like ASTM (American Society for Testing and Materials) or government agencies specify requirements for various security levels.

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