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Key Facts: C&G 6014 Gas Exam

100

Practice Questions

OpenExamPrep

Level 3 NVQ

Qualification Level

City & Guilds

~21 mbar

NG Working Pressure

GSIUR / BS 6891

0.004

Max CO/CO2 Ratio

Combustion guidance

IGEM/G/11

GIUSP Standard

IGEM

ACS-aligned

Gas Safe Recognised

City & Guilds

The City & Guilds 6014 Level 3 NVQ Diploma in Gas Utilisation is a competence-based gas industry qualification aligned to the ACS criteria and recognised by the Gas Safe Register. It is assessed through online unit knowledge tests, a workplace evidence portfolio and practical observation rather than a single timed exam, with knowledge tests typically requiring around 80%. The qualification covers gas safety legislation (GSIUR 1998 and the L56 ACOP), pipework sizing and tightness testing (BS 6891, the 1 mbar limit and ~21 mbar working pressure), combustion and flue gas analysis (CO/CO2 ratio thresholds), ventilation (BS 5440-2), flues and chimneys (BS 5440-1), appliance installation/commissioning/servicing, the Gas Industry Unsafe Situations Procedure (IGEM/G/11), and electrical safety in gas appliances. This free prep includes 100 research-based practice questions with explanations and an AI tutor.

Sample C&G 6014 Gas Practice Questions

Try these sample questions to review concepts for the C&G 6014 Gas exam. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1Which set of regulations places the principal legal duties on people carrying out work on domestic gas fittings and appliances in Great Britain?
A.The Building Regulations 2010 Part J
B.The Gas Safety (Installation and Use) Regulations 1998 (GSIUR)
C.The Pressure Systems Safety Regulations 2000
D.The Pipelines Safety Regulations 1996
Explanation: The Gas Safety (Installation and Use) Regulations 1998 (GSIUR), supported by the L56 Approved Code of Practice, are the principal statutory rules governing the installation, maintenance and use of gas fittings and appliances. They sit under the Health and Safety at Work etc. Act 1974.
2Under GSIUR, a person working on gas fittings in the course of business must be a member of a class of persons approved by the HSE. Which body currently holds that approval?
A.CORGI
B.Gas Safe Register
C.OFGEM
D.The Institution of Gas Engineers and Managers
Explanation: Since 1 April 2009 the Gas Safe Register is the HSE-approved body for businesses and engineers carrying out gas work in Great Britain, the Isle of Man and Guernsey. It replaced CORGI as the official registration scheme.
3An engineer holds a 6014 NVQ Diploma in Gas Utilisation but their ACS category certificates have lapsed. What is the correct position regarding carrying out domestic gas work?
A.The NVQ alone proves competence indefinitely so they may continue working
B.They must hold current ACS (or equivalent) certification and Gas Safe registration to be legally competent
C.They may work provided a registered engineer signs off the job afterwards
D.ACS is only advisory and registration is sufficient on its own
Explanation: Competence under GSIUR is demonstrated by current Accredited Certification Scheme (ACS) certificates renewed every five years, alongside Gas Safe registration. The 6014 NVQ supports the qualification route but does not replace current ACS certification for the work categories held.
4What is the principal purpose of the emergency control valve (ECV) in a domestic gas installation?
A.To regulate the appliance burner pressure
B.To allow the gas supply to the premises to be turned off in an emergency
C.To prevent backflow of flue gases
D.To filter debris from the incoming gas
Explanation: The emergency control valve is the consumer's means of shutting off the whole gas supply to the premises in an emergency. Under GSIUR it must be readily accessible, have a clearly indicated on/off position and be fitted as close as practicable to the meter or service entry.
5GSIUR requires that no gas appliance be installed in a private dwelling in certain rooms unless it is room-sealed or has a safety device. In which room is a non-room-sealed gas fire generally prohibited?
A.A kitchen
B.A bedroom or bathroom
C.A hallway
D.A living room
Explanation: GSIUR restricts the installation of open-flued and flueless appliances in rooms used for sleeping (bedrooms) and in bathrooms. In these rooms appliances must generally be room-sealed, or for bedrooms above a stated input fitted with an atmosphere-sensing device, because of the heightened carbon monoxide risk.
6What is the standard nominal operating (working) pressure for natural gas at the outlet of a domestic meter in the UK?
A.8 mbar
B.21 mbar
C.37 mbar
D.75 mbar
Explanation: Domestic natural gas (G20) is supplied at a nominal working pressure of about 21 mbar at the meter outlet, with appliances designed to operate at this low-pressure regime. The supply must remain within the permitted range (typically not below 19 mbar at the meter).
7When sizing low-pressure domestic gas pipework to BS 6891, what is the maximum permitted pressure drop between the meter outlet and any appliance at full rate for natural gas?
A.0.5 mbar
B.1.0 mbar
C.2.5 mbar
D.5.0 mbar
Explanation: BS 6891 limits the total pressure drop from the meter outlet to the most remote appliance to a maximum of 1 mbar for natural gas at maximum demand. Keeping within 1 mbar ensures every appliance still receives adequate working pressure.
8What is the approximate actual internal bore of standard 22 mm outside-diameter copper tube used for domestic gas pipework?
A.15 mm
B.19.5 mm
C.22 mm
D.25 mm
Explanation: Standard 22 mm OD copper tube has an actual internal bore of approximately 19.5 mm because of the wall thickness. Pipe-sizing tables in BS 6891 are based on this bore, and using nominal rather than actual bore would overstate capacity on long runs.
9During a let-by test on a domestic installation, what is the engineer checking for?
A.Gas passing through the emergency control valve when it is in the off position
B.The accuracy of the gas meter index
C.The free area of the ventilation opening
D.The CO/CO2 ratio at the appliance
Explanation: The let-by test confirms that the emergency control valve (or meter control) is holding tight and not allowing gas to pass into the test section while shut. Any rise on the gauge during the let-by period indicates the control is letting by and the tightness test cannot proceed.
10On a domestic low-pressure tightness test, to what pressure is the installation typically raised before the stabilisation and test period for natural gas?
A.10 mbar
B.20 to 21 mbar
C.37 mbar
D.100 mbar
Explanation: For natural gas the installation is pressurised to about 20-21 mbar (close to working pressure). After a one-minute stabilisation period to let temperature and pressure settle, the test is timed for two minutes and the gauge observed for any permissible or impermissible drop.

About the C&G 6014 Gas Exam

The City & Guilds 6014 Level 3 NVQ Diploma in Gas Utilisation is a competence-based gas industry qualification that supports Gas Safe registration. It combines online knowledge tests with a workplace portfolio and practical assessment, covering gas safety legislation, pipework and tightness testing, combustion analysis, ventilation, flues, appliance work, unsafe situations and electrical safety.

Exam sponsor: City & Guilds (delivered via approved centres). The requirements and fees below concern the certification or admission exam, separate from our free practice resources.

Assessment

NVQ Diploma combining online unit knowledge tests, a workplace evidence portfolio and practical assessment; aligned to the ACS criteria for Gas Safe registration. This practice bank is 100 selected-response gas-utilisation theory questions.

Time Limit

Varies by knowledge test module

Passing Score

Pass/competent (knowledge tests typically ~80%; assessor sign-off for the NVQ)

Exam / Certification Fees

Bundled in the centre/course fee (varies; typically several thousand GBP for the full programme)

Exam sponsor website

Fees, eligibility, and exam policies can change. Confirm them with the exam sponsor before applying or paying.

Our practice resources: topics covered

We aim to reflect publicly available exam outlines and topic information in our study resources. Coverage, format, and difficulty may differ from the actual exam, and we cannot guarantee that every detail is accurate or current. Confirm exam requirements, fees, and policies with the official exam sponsor.

14%

Gas Safety Legislation (GSIUR 1998)

GSIUR 1998 and L56 ACOP, Gas Safe Register and competence, ACS alignment, landlord duties (CP12), odorant and gas properties

16%

Pipework Sizing & Tightness Testing

BS 6891 pipe sizing and the 1 mbar limit, ~21 mbar working pressure, let-by and tightness testing, stabilisation, purging and leak detection

13%

Combustion & Flue Gas Analysis

Complete vs incomplete combustion, CO/CO2 ratio thresholds (0.004/0.008), analyser calibration/zeroing, flame appearance, calorific value and stoichiometric air

12%

Ventilation Requirements

BS 5440-2 ventilation (5 cm2/kW above the first 7 kW), open-flued vs room-sealed, compartment and internal-space ventilation, fan/spillage interaction

12%

Flues & Chimneys

Open-flue, room-sealed and flueless systems, BS 5440-1 terminal clearances, flue flow and spillage testing, chimney lining, draught diverters and terminals

13%

Appliance Installation, Commissioning & Servicing

Gas rate and burner pressure, calorific value, manufacturer's instructions, flame supervision devices, data plates, gas soundness, handover and notification

12%

Emergency & Unsafe Situations (GIUSP)

IGEM/G/11, Immediately Dangerous and At Risk classifications, warning notices, gas-escape actions, 0800 111 999 and RIDDOR reporting

8%

Electrical Safety in Gas Appliances

Safe isolation, earth continuity, polarity and insulation resistance, protective bonding (BS 7671, within 600 mm of entry), fuse rating and cable selection

Preparing for the C&G 6014 Gas Exam

What You Need to Know

  • Passing score: Pass/competent (knowledge tests typically ~80%; assessor sign-off for the NVQ)
  • Assessment: NVQ Diploma combining online unit knowledge tests, a workplace evidence portfolio and practical assessment; aligned to the ACS criteria for Gas Safe registration. This practice bank is 100 selected-response gas-utilisation theory questions.
  • Time limit: Varies by knowledge test module
  • Exam / certification fees: Bundled in the centre/course fee (varies; typically several thousand GBP for the full programme) Official sources

Using Our Practice Resources

  • Work through all 100 available questions
  • Review every answer and explanation
  • Track weak areas and revisit them
  • Use our AI tutor for tough concepts

C&G 6014 Gas: Suggested Study Strategy

1Learn the core values cold: NG working pressure ~21 mbar, 1 mbar maximum pressure drop (BS 6891), tightness test 20-21 mbar with 1-minute stabilisation and 2-minute test
2Memorise combustion thresholds: a clean appliance gives a CO/CO2 ratio of 0.004 or below, 0.004-0.008 needs servicing, and above 0.008 is a major fault
3Know the ventilation formula: 5 cm2 of free air per kW of net input above the first 7 kW for an open-flued appliance to BS 5440-2
4Be confident on GIUSP (IGEM/G/11): Immediately Dangerous vs At Risk, warning notices, and the emergency number 0800 111 999
5Don't neglect electrical safety: polarity, earth continuity, insulation resistance and protective bonding within 600 mm of the meter to BS 7671
6Complete all 100 practice questions and review every miss with the AI tutor before sitting the knowledge tests

Frequently Asked Questions

How is the City & Guilds 6014 Gas Utilisation qualification assessed?

The 6014 is a Level 3 NVQ Diploma assessed through online unit knowledge tests, a workplace evidence portfolio and practical observation by an assessor, rather than one timed exam. Knowledge tests typically require around 80% to pass, and the NVQ is competence-based.

Does the 6014 let me register with Gas Safe?

The 6014 is aligned to the ACS criteria recognised by the Gas Safe Register. Together with the relevant ACS category certificates (such as CCN1 plus appliance categories), it supports application to the Gas Safe Register so you can work legally on gas in Great Britain.

What topics does the 6014 cover?

It covers gas safety legislation (GSIUR 1998), pipework sizing and tightness testing, combustion and flue gas analysis, ventilation, flues and chimneys, appliance installation, commissioning and servicing, emergency and unsafe situations (GIUSP) and electrical safety in gas appliances.

What is the difference between this 6014 bank and an ACS CCN1 bank?

This bank focuses on the underpinning gas-utilisation theory and qualification framework of the 6014 NVQ across all eight content areas. An ACS CCN1 bank targets the specific core domestic natural gas safety assessment; the two complement each other.

What is a tightness test and what pressure is used?

A tightness test checks domestic pipework for leaks. For natural gas the installation is raised to about 20-21 mbar, allowed one minute to stabilise, then timed for two minutes; new pipework with no appliances must show no perceptible gauge movement.

Is this free 6014 practice as good as paid prep?

Our 100 practice questions cover the same gas-utilisation theory as the 6014 knowledge tests, with a teaching explanation for every answer plus free daily AI tutor interactions. All content is free forever and updated for 2026.