Normative documents and how to use them

The Regulations say what must be achieved: a flue must be effective, pipework must be tested. They rarely say how. That detail is in other documents, and an engineer needs to know which ones apply, how much weight each carries, and which edition is current.

From law to guidance

L56 prints all three together and marks which is which. The ACoP sets out recommended ways of meeting the Regulations, approved by HSE with the Secretary of State's consent. The guidance explains the law, gives technical detail and points to further information.

Normative documents

Below the law and L56 come the normative documents: the standards and codes that set out accepted ways of doing the work. For gas work, these include British Standards, IGEM standards and procedures (such as IGEM/UP/1B for tightness testing, and IGEM/G/11 for unsafe situations), and manufacturers' instructions.

L56 uses the term appropriate standard. It means a British Standard, or an equivalent standard or specification that gives the same level of safety, suitability and fitness for purpose, current at the time of the work.

Which comes first

When you're assessing whether an appliance or installation is correctly installed:

1. Check the manufacturer's instructions first, where they're available. They may differ from the standards, which is why you start with them.
2. If there are no instructions, assess against the current versions of the appropriate standards.

New installation work must be installed and fully commissioned in line with GSIUR, the manufacturer's instructions and the other appropriate industry standards.

Keeping up to date

Standards change, and the edition you trained on may not be the current one. M06 is an example: IGEM/UP/1B Edition 4 replaced Edition 3 on 1 October 2026 and changed how tightness tests are carried out. Even the ACS criteria can lag behind; CCN1 Issue 16 still refers to Edition 3 in places.

Gas Safe Register publishes a Legislative, Normative and Informative Document List (LNIDL) of the current normative documents, which L56 also points to. Registered engineers can view it online, along with Gas Safe technical bulletins and safety alerts.

Building Regulations' Approved Documents

The Building Regulations use a similar idea. Following an Approved Document (such as Approved Document J for combustion appliances) gives a presumption that you've complied with the requirement it covers, but you're free to meet the requirement another way. See 1.4.

Sources: L56 (2018) copyright page, paras 8–9ACoP and guidance status L56 (2018) Glossaryappropriate standard IGEM/G/11 Ed. 2 5.1instructions first, LNIDL Approved Document J (2010, 2022 amendments)presumption of compliance CCN1 Issue 16 §1assessed

▸Tutor notes

• Give learners a situation where the manufacturer's instructions and a British Standard disagree (for example on a clearance) and ask which applies, and why.
• Ask learners to find the current edition of a standard they use on the Gas Safe Register document list, and compare it with the copy in their van.
• Use the IGEM/UP/1B Edition 4 changes as a case study in why "current at the time of the work" matters.