When it comes to securing critical infrastructure — from electrical substations to water treatment plants and industrial facilities — not just any door will do. That’s where LPS 1175 and SR2 certification come into play.
These industry standards are designed to help organisations specify and install doors, enclosures, and other physical security products that offer real protection against forced entry and vandalism.
In this article, we’ll break down what LPS 1175 is, what SR2 rating means, and why it’s essential for infrastructure security.
What is LPS 1175?
LPS 1175 is a globally recognised standard developed by the Loss Prevention Certification Board (LPCB). It stands for Loss Prevention Standard 1175 and provides a rigorous testing framework for evaluating the resistance of security products to forced entry.
Products are tested by simulating physical attacks using specific tools over set time periods. The goal is to evaluate how long the product can resist a determined intruder.
LPS 1175 tests are based on:
Attack tools used (e.g., crowbars, hammers, drills)
Attack duration (how long an attacker can persist)
Construction quality and locking mechanisms
What Does SR2 Mean?
Within the LPS 1175 standard, security products are categorised into different Security Ratings (SR), from SR1 to SR8, with increasing levels of protection.
An SR2-rated door offers more resistance than SR1, and is certified to withstand a sustained attack using a wider range of tools over a longer period.
SR2 doors are tested to:
Resist attacks for up to 3 minutes using tools such as bolt cutters, claw hammers, and hand drills
Protect against more determined and better-equipped intruders than SR1
Why SR2 Certification Matters for Infrastructure
1. Compliance with Client Requirements
Many UK infrastructure organisations — including electricity, water, and rail companies — require LPS 1175 SR2 certified doors for their sites. This ensures that physical security meets industry benchmarks.
2. Enhanced Security in Vulnerable Locations
Sites like remote substations and unmanned utility buildings are often targets for vandalism or theft. SR2 doors provide an added level of deterrent and protection.
3. Insurance and Liability
Specifying SR2-certified doors may be a requirement for insurance coverage or reduce risk premiums by demonstrating proactive security planning.
4. Peace of Mind
When you install an SR2-rated product, you’re not just installing steel — you’re installing certified, tested, and trusted protection.
AIG Enclosures: Your Partner for SR2-Rated Security Doors
At AIG Enclosures, we manufacture LPS 1175: Issue 8 SR2 certified steel doors for the UK’s most demanding infrastructure projects. Our doors are trusted by utility providers, local authorities, and major contractors.
Combined with our Beasall™ anti-vandal grit finish and precision engineering, our SR2-rated doors provide robust protection where it matters most.
Need help specifying a secure door for your project?
Contact us today to speak with our technical team or request a quote.