ACS CCN1 Core Domestic Natural Gas Safety Assessment Vocabulary Game
Exam terms with clues and explanations by OpenExamPrep.
About the ACS CCN1 Core Domestic Natural Gas Safety Assessment Vocabulary Game
A free word game for the ACS CCN1 Core Domestic Natural Gas Safety Assessment exam. Each round shows a clue for one of 20 exam terms across 10 topics. Recall the term, spell it out, then read a short explanation. Rounds pick a random term, so you can keep playing as long as you like.
How to Play
- 1Read the clue and type a term with the right number of letters (3 to 6). Abbreviations count: type the letters only.
- 2Press Check Answer or Enter. Each letter changes color to show how close you are.
- 3You have 6 tries. Stuck? Need a hint? asks the AI tutor for a nudge without giving the term away, and Skip moves to a new term.
- 4After the round, read the explanation, ask the AI to explain it, share your result, or press Next.
- ARight letter, right spot
- AIn the term, wrong spot
- ANot in the term
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Topics in the ACS CCN1 Core Domestic Natural Gas Safety Assessment Vocabulary Game
Gas legislation
Emergency actions
Emergency isolation
Combustion
Ventilation
Pipework
Tightness testing
Gas rating
Chimney systems
Unsafe situations
Sources for these terms (8)
- Domestic gas: frequently asked questions · Source checked 2026-11-03
- Gas safety - Carbon monoxide awareness frequently asked questions · Source checked 2026-11-03
- The Gas Safety (Installation and Use) Regulations 1998, Regulation 2 · Source checked 2026-11-03
- The Gas Safety (Installation and Use) Regulations 1998, Regulation 37 · Source checked 2026-11-03
- CCN1 Safety Assessment Criteria Initial Domestic Natural Gas, Issue 20.1 · Source checked 2026-11-03
- The Gas Safety (Management) Regulations 1996, Regulation 7 · Source checked 2026-11-03
- The Gas Safety (Installation and Use) Regulations 1998, Regulation 22 · Source checked 2026-11-03
- The Reporting of Injuries, Diseases and Dangerous Occurrences Regulations 2013, Regulation 11 · Source checked 2026-11-03
About the ACS CCN1 Exam
The ACS CCN1 Core Domestic Natural Gas Safety Assessment is the core competence assessment required for Gas Safe registration in domestic natural gas work. It is an open-book assessment combining written theory (multiple-choice, short-written and scenario questions) with an observed practical, covering GSIUR 1998, tightness testing, gas rating, ventilation, flueing, combustion analysis and unsafe situations.
Exam sponsor: Gas Safe Register via ACS-approved assessment centres (e.g. LCL Awards, BPEC). The requirements and fees below concern the certification or admission exam, separate from our free practice resources.
Assessment
Open-book written theory (multiple-choice, short-written and scenario questions on GSIUR, tightness testing, ventilation, flueing and combustion) plus an observed practical assessment; each subject area must be passed. This practice bank is 118 selected-response items for the theory knowledge.
Time Limit
Varies by ACS centre and assessment package
Passing Score
Each subject area must be passed (centres typically require around 80% on theory components)
Exam / Certification Fees
Approximately £350-£600 (varies by centre; initial vs re-assessment differ)
Exam sponsor websiteFees, eligibility, and exam policies can change. Confirm them with the exam sponsor before applying or paying.
Official sources
Frequently Asked Questions
Is the ACS CCN1 vocabulary game free?
Yes. The game is free to play with no sign-up. Signing in adds AI explanations for any term.
How does the ACS CCN1 vocabulary game work?
Each round shows a clue for one of 20 ACS CCN1 terms. Guess the term in six tries: green means the right letter in the right spot, yellow means the letter is in the term but in another spot, and gray means it is not in the term. After the round, read the explanation and play the next term.
Where do the ACS CCN1 terms come from?
OpenExamPrep researched each term from the Gas Safe Register via ACS-approved assessment centres (e.g. LCL Awards, BPEC) content outline and primary sources, listed under Sources on this page. The game is independent study material, not an official exam resource.
What is the ACS CCN1 assessment and why do I need it?
CCN1 is the Core Domestic Natural Gas Safety assessment. It is the core competence required to register with the Gas Safe Register for domestic natural gas work, so you must hold it (alongside relevant appliance modules) to work legally on domestic gas in Great Britain.
How is the CCN1 assessment structured?
CCN1 is open book and combines written theory (multiple-choice, short-written and scenario questions) with an observed practical. Each subject area must be passed, and theory components at most centres require around 80%.