--- title: "Intruder Alarm Installation | SPS Technical" description: "Professional installation of advanced commercial intruder alarms. 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[Home](/) 2. [Services](/services) 3. [Intruder Alarms](/services/intruder-alarms) 4. Installation [Back to intruder alarm systems](/services/intruder-alarms) Intruder Alarm Installation # Commercial Intruder Alarm Installation — Graded Systems to EN50131 and PD6662 Risk-assessed, graded intruder alarm design and installation for commercial and industrial premises across Yorkshire, Lincolnshire and the Humber. [Installation](/services/intruder-alarms/installation)[Maintenance](/services/intruder-alarms/maintenance)[PSTN migration](/services/intruder-alarms/pstn-migration)[Monitoring](/services/intruder-alarms/monitoring) SPS Technical designs and installs graded intruder alarm systems for commercial and industrial premises across Yorkshire, Lincolnshire and the Humber. Every installation begins with a risk assessment that determines the correct grade under EN50131 and PD6662 — from Grade 2 for low-to-medium risk premises up to Grade 3 for higher-value commercial sites requiring confirmed alarm response and ARC monitoring. As an SSAIB-certified installer, every system we commission is eligible for a police Unique Reference Number for Type A confirmed response. Grading explained Under EN50131 and PD6662, every intruder alarm must be graded to reflect the level of risk at the premises. The grade determines detector specification, panel capability, signalling requirements and ARC monitoring standards. Getting the grade wrong means either under-protecting your premises or paying for unnecessary capability — and insurers and police check compliance. SPS Technical carries out a full risk assessment before specifying any system. Alarm grading EN50131 alarm grades — choosing the right level Under EN50131 and PD6662, every intruder alarm must be graded to reflect the level of risk at the premises. The grade determines detector specification, panel capability, signalling requirements and ARC monitoring standards. G1 Grade 1 Low risk Premises unlikely to attract targeted intruders. Opportunistic threat only. Rarely specified for standalone commercial premises. Low-risk internal areas and storage spaces G2 Grade 2 Low to medium risk Minimum standard accepted by most insurers for commercial premises. Assumes opportunistic intruder with basic tools. Offices, small retail, light commercial G3 Grade 3 Medium to high risk Standard for most commercial premises with valuable stock or assets. Required for police URN and Type A ARC response. Required for police response — most commercial sites G4 Grade 4 High risk Very high value premises. Assumes planned attack and specialist knowledge. Intruder may attempt to tamper with the system itself. Cash handling, data centres, high-security sites **Grade 3 is the practical standard for most commercial premises** — and the minimum required for police URN and Type A confirmed alarm response via an Alarm Receiving Centre. SPS Technical carries out a full risk assessment before specifying any system. Detection technology ## Intruder Detection Technology Modern commercial intruder alarm systems use a combination of detection technologies to minimise false alarms while maintaining reliable detection. PIR detectors are the standard for most internal spaces. Dual-technology detectors combine PIR and microwave to reduce nuisance alarms in challenging environments. Door contacts, shock detectors and vibration detectors provide perimeter coverage. Grade 3 systems require detectors with anti-masking capability to prevent deliberate interference. PIR detectors Passive infrared movement detection, the standard for most commercial spaces Dual-technology detectors PIR plus microwave, reducing false alarms in challenging environments Door and window contacts Perimeter detection on all access points Shock detectors Glass break and impact detection for perimeter security Vibration detectors Structural attack detection for high-risk premises CCTV-verified detection Visual confirmation reducing false alarm callouts ## Alarm Signalling and ARC Monitoring Grade 3 systems require dual-path signalling to an Alarm Receiving Centre — two independent transmission routes so that a single path failure cannot prevent an alarm reaching the monitoring centre. SPS Technical installs IP and 4G dual-path signalling to EN50136 on all new Grade 3 systems. With the PSTN analogue telephone network being switched off across the UK, all new installations use IP or 4G signalling as standard. Dual-path signalling ### Grade 3 requires IP/4G dual-path Grade 3 systems require dual-path signalling to an ARC — two independent transmission routes so that a single path failure doesn't prevent an alarm reaching the monitoring centre. SPS Technical installs IP and 4G dual-path signalling to EN50136, maintaining ARC connection and police response eligibility even if one path is disrupted. With the PSTN switch-off underway, all new installations use IP/4G signalling as standard. Our process ## How a Graded Intruder Alarm Installation Works Every SPS Technical intruder alarm installation follows a structured process from risk assessment through to SSAIB certification. No system is commissioned without full zone testing, entry/exit timing verification and ARC connection confirmation. 1 Risk assessment Premises, contents, occupancy and threat level assessed 2 System design Grade determined, detector placement and panel specified to EN50131/PD6662 3 Installation Detectors, panel, sounders and signalling equipment installed 4 Commissioning All zones tested, entry/exit timing configured, ARC connection established 5 Certification SSAIB certificate of compliance issued, police URN applied for 1 Risk assessment Premises, contents, occupancy and threat level assessed 2 System design Grade determined, detector placement and panel specified to EN50131/PD6662 3 Installation Detectors, panel, sounders and signalling equipment installed 4 Commissioning All zones tested, entry/exit timing configured, ARC connection established 5 Certification SSAIB certificate of compliance issued, police URN applied for Knowledge Centre ## Related Technical Guides [View all guides](/news) [ ![SPS Technical engineer diagnosing a commercial intruder alarm fault](https://media.base44.com/images/public/6989f2350e53aab8836435e3/f7993aae0_generated_image.png) Technical Guide ### Emergency Intruder Alarm Repair and Maintenance: A Business Guide A practical guide to commercial intruder alarm faults, emergency repair, planned maintenance, signalling issues, system takeovers and reducing security downtime. 24 Aug 2026 Read ](/news/emergency-intruder-alarm-repair-maintenance)[ ![Commercial intruder alarm system installed in a UK business premises](https://media.base44.com/images/public/6989f2350e53aab8836435e3/bb9358a60_generated_image.png) Technical Guide ### Commercial Intruder Alarm Systems: A Business & Facilities Manager's Guide A practical guide for business owners and facilities managers on choosing a commercial intruder alarm, including risk, Grades 2 and 3, monitoring, police response, SSAIB certification, integration and lifecycle maintenance. 24 Aug 2026 Read ](/news/commercial-intruder-alarm-systems-guide) [View all guides](/news) ### Book an intruder alarm site survey Risk assessment, system design and itemised quote — no obligation. 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