Understanding Fence Classifications in KSA: A Complete Guide to SAIS Compliant Class 1, 2, 3, and 4 Fences

In the Kingdom of Saudi Arabia, the Supreme Authority for Industrial Security (SAIS), formerly HCIS, sets clear guidelines for perimeter security at industrial facilities. These guidelines, documented in SAIS 2017 SEC-02, outline five categories of fencing systems, but for most high-security and industrial projects, Classes 1–4 are the primary focus.

In this blog, we’ll simplify what each class means, and more importantly, show you how A-1 Fence Arabia products fit perfectly into these classifications.

Class 1: Fencing Systems for Facilities with FSC Class 1 

Where it’s used: Class 1 is the highest level of perimeter protection, mandated for critical infrastructure where both vehicle-borne and pedestrian threats must be stopped.
 

SAIS Requirement Highlights:
 

• Anti-Personnel Fence (APF): Minimum 3 m height, rigid welded mesh, anti-climb/anti-cut, delay-rated in accordance with ASTM F2781-15, topped with 3 layers of concertina razor tape (two at the top and one at the bottom).
• Anti-Vehicle Barrier (AVB): Crash-rated to stop hostile vehicles, compliant with ASTM F2656 crash-test standards.
• Multiple security layers, including clear zones, patrol roads, intrusion detection, CCTV, and lighting.

Our Solution:
 

• A1 AKAT® NG 30: A rigid welded mesh, delay-rated and certified anti-personnel fence, compliant with SAIS SEC-02 and tested to ASTM F2781-15. Delays aggressive forced entry attempts for 6.4 minutes, giving your security team critical response time.
• A1 Alcazar Anti-Vehicle Rope Barrier: Crash-tested to ASTM F2656 M50 P1, capable of stopping a 6.8-ton vehicle at 50 mph within 1 m penetration distance. Rope design ensures both strength and minimal visual obstruction.

Together, this Class 1 configuration forms the ultimate SAIS-compliant perimeter, stopping intruders both on foot and in vehicles. It’s ideal for power plants, substations, pump stations, water transmission systems, sea ports, and other critical national infrastructure where breaches can have severe consequences.
 

HCIS class 1 fence solutions deliver the strongest perimeter protection available, with certified systems ensuring long-term reliability. Our HCIS Class 1 fencing integrates seamlessly with a complete HCIS security system for maximum defense across critical sites.
 

Class 2: Fencing Systems for Facilities with FSC Class 2

Where it’s used: For high-risk industrial sites where vehicle attack risk may be lower, but human intrusion risk remains critical.
 

SAIS Requirement Highlights:
 

• Same high-spec Anti-Personnel Fence as Class 1.
• May omit Anti-Vehicle Barrier if the Security Risk Assessment permits.
• Includes intrusion detection, CCTV coverage, and lighting.

Our Solution:
 

• A1 AKAT® NG 30: The same delay-rated, certified welded mesh fence used in Class 1, ensuring full SAIS compliance and exceptional anti-intrusion performance.
• Flexible integration with electronic detection and surveillance systems to match SAIS Category 2 standards.

Perfect for oil & gas facilities, power plants, and other sensitive industrial operations. Class 2 fence designs offer a balance between cost-effectiveness and safety. With HCIS fence standards in place, facilities can strengthen their perimeter and integrate advanced HCIS security system components to protect vital operations.
 

Class 3: Fencing Systems for Facilities with FSC Class 3

Where it’s used: For medium-security zones within industrial complexes or for facilities with moderate security needs.
 

SAIS Requirement Highlights:
 

• 3 m high chain-link or rigid welded mesh fence, configured with two layers of concertina razor tape (one on top and one facing outward at the top).
• 6 m clear zones for visibility.
• CCTV and lighting, with intrusion detection determined by risk level.

Our Solution:
 

• CLF Fence + 2 Rows Concertina Coil Robust chain-link fencing system reinforced with two rows of concertina coil for deterrence and delay.
• Economical yet compliant with SAIS standards for HCIS Class 3 perimeters.

Commonly used for storage yards, secondary facility boundaries, and utility infrastructure. HCIS class 3 fence systems meet the standards defined by the Supreme Authority for Industrial Security, offering reliable deterrence. Combined with an HCIS security system, these solutions strengthen defense for medium-risk industrial environments.
 

Class 4: Fencing Systems for Facilities with FSC Class 4

Where it’s used: For outer property lines or facilities with lower security requirements, where the main goal is demarcation and basic intrusion deterrence.
 

SAIS Requirement Highlights:
 

• 3 m high chain-link or rigid welded mesh fence, configured with one layer of concertina razor tape on top.
• Perimeter lighting and optional CCTV.

Our Solution:

• CLF Fence + 1 Row Concertina Coil Cost-effective chain-link fence with one row of concertina coil, meeting HCIS Class 4 SAIS standards.

Ideal for property boundary marking, remote areas, or buffer zone enclosures. HCIS class 4 fence solutions provide affordable, compliant perimeter control for lower-risk areas. Supported by an HCIS fence framework and an integrated HCIS security system, they ensure strong boundary marking with dependable deterrence.
 

Why Partner with A1 Fence Arabia?

From maximum-security Class 1 perimeters to practical Class 4 boundaries, our solutions are engineered for SAIS compliance and customized for your facility’s risk profile.
 

We deliver integrated perimeter security systems combining fencing systems, physical barriers, and electronic detection, ensuring you meet regulatory requirements and operational needs. By aligning with the Supreme Authority for Industrial Security standards, we deliver trusted solutions. Our HCIS security system integration ensures consistent compliance, reliability, and superior protection for diverse industries in Saudi Arabia.
 

Ready to secure your perimeter?

Contact A1 Fence Arabia today for a free consultation on the right SAIS-compliant fence for your facility.