ACS Gas Assessment (UK): CCN1 and Appliance Modules — Guides
ACS Appliance Modules (CENWAT, CKR1, HTR1) and Gas Safe Registration
Which ACS modules sit on top of CCN1, what each lets you work on, and who may register with Gas Safe: the law, the core qualification, probation and the annual renewal.
ACS Gas Assessment Format: Practical Tasks and Knowledge Questions
How the UK ACS gas assessment is built: who writes the criteria, who assesses, practical performance and knowledge, oral questioning, and the entry routes for new and experienced engineers.
ACS Gas Re-assessment Every 5 Years: What Lapses and How to Renew
ACS certificates of gas safety competence last five years. What runs out with your core, what Gas Safe needs at renewal, the two renewal routes and the checks to make before winter.
What Is on the CCN1 Gas Assessment? The 16 Areas, Issue 20.1
CCN1 is the core domestic gas safety assessment of the ACS scheme behind Gas Safe registration. The 16 areas of Issue 20.1, what is practical and what is knowledge, and the regulations it names.