--- title: "PD 6662:2017 explained in plain English | SPS Technical" url: https://sps-technical.com/resources/standards/pd-6662 description: "PD 6662:2017 is the scheme that applies the European intruder alarm standards (the BS EN 50131 series) in the UK. It sets how a system is graded from 1 to 4…" lang: en-GB --- PD 6662:2017 Current edition Intruder alarms # PD 6662: intruder alarm grades and standards in the UK, explained Reviewed by the SPS Technical team · Last checked 12 October 2026 ## Quick answer PD 6662:2017 is the scheme that applies the European intruder alarm standards (the BS EN 50131 series) in the UK. It sets how a system is graded from 1 to 4 by risk, which other British Standards apply alongside it, and is the standard police and insurers expect a monitored intruder alarm to meet. ## What it means for you - Your intruder alarm should be designed to a security grade matched to your risk, usually Grade 2 or 3 for businesses. - Every part of the system should be at least the grade of the system as a whole. - If you want police response, the system must be installed and maintained to PD 6662 by a certified company. - Ask for a certificate that states the grade and the standards the system meets. ## Who it applies to Anyone installing, maintaining or relying on an intruder or hold-up alarm in the UK, particularly where insurers or the police require a certified, graded system. ## Common questions What grade of intruder alarm do I need? It depends on your risk. Grade 1 is low risk, Grade 2 suits most homes and many small businesses, Grade 3 is typical for higher-value commercial premises and Grade 4 is for very high-risk sites. Your insurer may specify a grade. Is PD 6662 needed for police response? Yes. The police policy for security systems requires monitored intruder alarms to be installed and maintained to PD 6662 by a company certified to do so. ## Official sources - Search BSI Knowledge: https://knowledge.bsigroup.com/search?query=PD%206662 This page is a plain-English summary, not a copy of the standard. British Standards are copyright of BSI. 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