100+ Free ACS MET1 Gas Meters Practice Questions
Prepare for the ACS MET1 Domestic Gas Meters Assessment exam with instant access — no signup required.
Loading practice questions...
Explore More UK Gas Safe / ACS Gas Assessments
Continue into nearby exams from the same family. Each card keeps practice questions, study guides, flashcards, videos, and articles in one place.
More From This Family
Videos and articles for deeper review.
Key Facts: ACS MET1 Gas Meters Exam
100 Q
Practice Questions
OpenExamPrep
Up to 6 m³/h
Meter Capacity Scope
Gas Safe / ACS MET1 Standard
20 mbar
Tightness Test Pressure
IGEM/UP/1B
Within 600 mm
Equipotential Bonding Distance
BS 7671 / GSIUR
Every 5 years
ACS Re-assessment Cycle
ACS Scheme Rules
0800 111 999
National Gas Emergency Number
Gas Safe Register
ACS MET1 (Domestic Gas Meters) is the UK assessment required for Gas Safe registered operatives installing or exchanging primary and secondary domestic gas meters up to 6 m³/h capacity. The official assessment combines open-book written theory with a mandatory practical test on meter rigs. Key topics include Gas Safety Regulations (GSIUR 1998), BS 6400-1 meter box clearances, BS 7671 main protective equipotential bonding (10 mm² copper within 600 mm of meter outlet), IGEM/UP/1B tightness testing (20 mbar for 2 minutes, 4 mbar max drop for existing U6 installations with no smell of gas), ECV let-by testing (9-10 mbar), purge volume calculations, standing and working pressure checks, and GIUSP unsafe situation classifications (ID, AR, NCS). This practice bank offers 100 English-language study questions for the theory component.
Sample ACS MET1 Gas Meters Practice Questions
Try these sample questions to test your ACS MET1 Gas Meters exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.
1Under the Gas Safety (Installation and Use) Regulations 1998 (GSIUR) Regulation 3, what qualification must an engineer hold before installing, exchanging, or commissioning a domestic gas meter in the UK?
2What is the maximum badged gas flow capacity for a domestic meter covered under the scope of the ACS MET1 module?
3What is the primary function of an Emergency Control Valve (ECV) installed on a domestic gas meter installation?
4According to BS 7671 and GSIUR Regulation 18, where must the main protective equipotential bonding connection be made on a domestic gas installation?
5What minimum copper conductor cross-sectional area is required for main protective equipotential bonding under BS 7671 for a standard domestic gas installation?
6What is the standard test pressure used when conducting a tightness test on a low-pressure natural gas domestic installation with a U6 meter per IGEM/UP/1B?
7What is the required stabilization period before commencing the 2-minute timed tightness test under IGEM/UP/1B?
8During a tightness test on an existing domestic installation with appliances connected and a calculated Installation Volume (IV) of 0.008 m³, what is the maximum permissible pressure drop over the 2-minute test under IGEM/UP/1B Edition 4 (natural gas) if NO gas smell is detected?
9What is the purpose of conducting a let-by test on the Emergency Control Valve (ECV) prior to performing a main tightness test?
10What is the nominal standing pressure expected at the test point of a low-pressure domestic natural gas meter when all appliances are turned off?
About the ACS MET1 Gas Meters Exam
The ACS MET1 assessment validates a gas engineer's competence to install, exchange, commission, disconnect, and service domestic gas meters up to 6 m³/h capacity (such as U6, G4, and E6 smart meters). Candidates must demonstrate comprehensive knowledge of GSIUR 1998, BS 6400-1 meter installation standards, BS 7671 protective equipotential bonding within 600 mm of the meter outlet, IGEM/UP/1B tightness testing and let-by procedures, operating pressure verification, metric/imperial gas rating, and GIUSP IGEM/G/11 unsafe situations procedures.
Assessment
Open-book written theory assessment combined with an observed practical performance test on domestic meter installation rigs. This practice bank provides 100 research-based multiple-choice study questions covering the underpinning theory syllabus.
Time Limit
Varies by ACS centre (typically 2 to 4 hours total)
Passing Score
100% on safety-critical practical criteria and ~80% on theory components
Exam Fee
Approximately £150-£300 (varies by ACS centre; often packaged with CCN1) (Gas Safe Register / ACS Approved Assessment Centres (e.g. LCL Awards, BPEC, City & Guilds))
ACS MET1 Gas Meters Exam Content Outline
Gas Safety Legislation & Standards
GSIUR 1998 Regulation 3, 14, 18, 25, 26, 33, BS 6400-1, BS 6891, and Gas Safe registration duties.
Meter Types & Components
Diaphragm U6/G4 meters, electronic ultrasonic E6 smart meters, regulators, ECVs, and meter box specifications.
Meter Installation & Exchange
Installing, exchanging, commissioning primary and secondary meters up to 6 m³/h, brackets, and clearances.
Equipotential Bonding
BS 7671 main bonding within 600 mm of meter outlet, 10 mm² copper cable, BS 951 clamps, and temporary continuity jumpers.
Tightness Testing & Purging
IGEM/UP/1B ECV let-by test (9-10 mbar), tightness test at 20 mbar, allowable pressure drops, and purge volume calculations.
Operating Pressures & Gas Rating
Standing pressure (18.5-21.5 mbar), working pressure (min 19 mbar), meter pressure absorption (<1 mbar), and gas rating.
Unsafe Situations & Emergencies
GIUSP IGEM/G/11 defect categories (ID, AR, NCS), warning notices, ECV locking, and Gas Emergency (0800 111 999).
How to Pass the ACS MET1 Gas Meters Exam
What You Need to Know
- Passing score: 100% on safety-critical practical criteria and ~80% on theory components
- Assessment: Open-book written theory assessment combined with an observed practical performance test on domestic meter installation rigs. This practice bank provides 100 research-based multiple-choice study questions covering the underpinning theory syllabus.
- Time limit: Varies by ACS centre (typically 2 to 4 hours total)
- Exam fee: Approximately £150-£300 (varies by ACS centre; often packaged with CCN1)
Keys to Passing
- Work through all 100 available questions
- Review every answer and explanation
- Track weak areas and revisit them
- Use our AI tutor for tough concepts
ACS MET1 Gas Meters Study Tips from Top Performers
Frequently Asked Questions
What is the ACS MET1 assessment and who needs it?
ACS MET1 is the Nationally Accredited Certification Scheme module for domestic gas meters up to 6 m³/h capacity (U6, G4, E6). It is required for Gas Safe registered engineers who install, exchange, commission, or disconnect domestic gas meters in the UK.
What core qualification is required before taking MET1?
Candidates must hold a current CCN1 (Core Domestic Natural Gas Safety) certificate or equivalent managed learning programme qualification.
Does this practice bank replace the practical ACS assessment?
No. The official ACS MET1 assessment includes a mandatory hands-on practical test on live gas meter rigs. This practice bank provides 100 multiple-choice questions as an English-language study adaptation to help candidates master the underpinning technical theory.
What are the key tightness testing pressures for MET1 under IGEM/UP/1B?
Let-by testing of the ECV is conducted at 9-10 mbar for 1 minute. Main tightness testing is conducted at 20 mbar over a 2-minute test period after a 1-minute stabilization. On existing U6 installations with appliances, a maximum 4 mbar drop is permitted provided there is no smell of gas.
Where must main protective equipotential bonding be connected?
Under BS 7671, main bonding must be attached using a BS 951 clamp to the consumer's hard metallic outlet pipework within 600 mm of the meter outlet connection, before any branch pipework, using a minimum 10 mm² copper conductor.