The short answer
LPS 1175 is a security standard published by the Loss Prevention Certification Board. A certified product has been attack-tested with a defined toolkit for a set time. Under Issue 8 ratings look like C5: the letter is the threat level, the number is the minutes of delay.
Who publishes LPS 1175?
LPS 1175 is published by the Loss Prevention Certification Board (LPCB), part of BRE. Manufacturers submit products for testing and, if they pass, are listed as certified for that product and rating.
How are Issue 8 ratings written?
Issue 8 uses a letter and a number. The letter, from A to H, describes the threat level: the type of attacker and toolkit used in the test. The number describes how long the product resisted that attack in minutes: 1, 3, 5, 10, 15 or 20. A rating of B3 means the product resisted the B toolkit for at least three minutes of attack time.
How do the old SR ratings compare?
Earlier issues used security ratings SR1 to SR8. The usual correspondence is SR1 to A1, SR2 to B3, SR3 to C5, SR4 to D10, SR5 to E20, SR6 to F20, SR7 to G20 and SR8 to H20. Many products are still sold with SR ratings.
Who holds the certificate?
The certificate belongs to the manufacturer for a specific tested product. An installer does not become certified by fitting it. Ask for the certificate reference and check it against the LPCB's published listings before you buy, and make sure the product is installed as the manufacturer specifies.
Do I need a certified grille?
Most homes and many shops do not. Certified products make sense where an insurer, head office or specifier asks for them, or where the risk justifies the extra cost and weight. Start from the requirement, not the highest number available.
Sources
This guide is general information, not legal advice. Rules differ between England, Wales, Scotland and Northern Ireland; check with your council, building control or insurer where it matters.
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