Zaun develops SR3 fencing for Critical National Infrastructure applications

A high-security fence for rail and other Critical National Infrastructure (CNI) applications that resists sustained attack with specialist power tools for more than five minutes has been developed by steel mesh fencing manufacturer Zaun.

Zaun has received a revised Certificate of Product Approval from the Loss Prevention Certification Board to include its brand new CorruSec SR3 approved to Security Rating 3. The fencing system incorporates corrugated HiSec 3-5-10 mesh sandwiched between further panels of HiSec 3-5-10, a special welded steel wire fence panel similar to the type of mesh usually used for prison fencing, whose name is derived from its mesh size: 3″ × 0.5″ × 10 gauge.

The original concept was the idea of Zaun co-founder and director Alastair Henman and has been developed by R&D manager Adam Christie. Christie explained: “Alastair conceived the design by looking at the construction of cardboard, in particular the corrugated kind and how the corrugated element created a much stronger three-dimensional material. We started experimenting with a corrugated mesh centre section to give fencing greater rigidity and increase its thickness without adding much to the material content and weight in order to counter the kind of tools attackers might use.”

ZaunSR3Fencing

CorruSec SR3 has been subjected to sustained attack by testers from the Building Research Establishment wielding a range of hand and power tools, yet they couldn’t breach the CorruSec SR3 in less than five minutes.

The fencing system is manufactured to BS 1722 Part 14 and is approved at heights from 2.4 metres to 6 metres above the ground, in ground or base-plated options.

Each individual panel features a 76.2 mm x 12.7 mm mesh configuration with 3 mm horizontal and vertical wires. The corrugated section is pressed to approximately 100 mm in depth. All three layers are bolted together using bolts fixed into place in a grid pattern throughout the combined fence panel.

CorruSec SR3 provides good through visibility for use with CCTV cameras, while security toppings can be added to suit.

Alastair Henman explained: “The current specification for CrossRail stations is a ‘5-minute fence’, so we set about seeing if we could create a viable product. Across our customer base, operators of CNI are upgrading their most sensitive sites given  the heightened fear of terrorist threats and advances in technology.”

As well as rail applications, SR3 fencing is ideal for protecting assets at water utilities, oil and gas compounds, Data Centres and other CNI sites.

 

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