1
CERTSure LLP NICEIC CMA2LS LIMITED SCOPE DOMESTIC GAS
METER INSTALLATION EXAM FULL PACKAGE QUESTIONS
ANSWERS AND RATIONALES 2026-27 LATEST UPDATED VERSION
INSTANT DOWNLOAD PDF..!!
INTRODUCTION
The Certsure LLP NICEIC CMA2LS Limited Scope Domestic Gas Meter Installation Exam is a specialised
assessment designed to evaluate a candidate's competence in the safe installation of domestic gas meters with
a capacity not exceeding 6 m³/h, where the meter outlet is sealed off and labelled. This exam is a critical
milestone for gas engineers, meter installers, and new entrants to the gas industry who wish to gain
certification under the Accredited Certification Scheme (ACS) and register with the Gas Safe Register. The exam
format consists of multiple-choice and scenario-based questions covering gas safety legislation, emergency
actions, tightness testing, purging, meter regulator checking, and the correct positioning of emergency
isolation controls. This exclusive question bank has been meticulously crafted to mirror the difficulty and
structure of the actual assessment, covering all core competencies required for the CMA2LS certification. By
engaging with these advanced, application-level questions, you will move beyond rote memorisation and
develop the critical safety reasoning necessary to pass your exam and work competently in the field.
CORE DOMAINS TESTED
1. Gas Safety Legislation and Standards: The Gas Safety (Installation and Use) Regulations, British
Standards (BS 6400), IGEM standards, and the scope and limitations of the CMA2LS certification.
2. Gas Emergency Actions and Procedures: Responding to gas escapes, use of emergency notices and
warning labels, and the correct procedure for isolating gas supplies in emergency situations.
3. Installation of Pipework and Fittings (Meter Installation): Pipework within the meter installation,
selection of fittings, support and protection requirements, and connection methods.
4. Tightness Testing and Purging: Strength testing, tightness testing procedures, permissible pressure
drops, direct purging of meter installations, and safety precautions during purging.
5. Checking and Setting Meter Regulators: Operating principles of meter regulators, checking regulator
performance, adjusting outlet pressure, and identifying regulator faults.
6. Unsafe Situations, Use of Emergency Notices and Warning Labels: Classification of unsafe situations
(ID, AR, etc.), correct use of warning labels and notices, and procedures for dealing with unsafe
installations.
7. Operation and Positioning of Emergency Isolation Controls and Valves: Siting requirements for
emergency control valves (ECVs), meter inlet valves (MIVs), accessibility, labelling, and operation.
8. Ventilation Requirements for Gas Meters: Ventilation of meter enclosures and compartments,
internal meter locations, and compliance with IGE/GM8 and related standards.
9. Meter Installation Site Assessment: Checking the intended installation site, assessing suitability, and
identifying potential hazards.
10. Labelling, Recording, and Handover: Labelling of meter installations, recording installation details,
and handover procedures to the responsible person.
,2
QUESTIONS 1-200
Q1: A gas engineer is installing a primary domestic gas meter with a
capacity of 6 m³/h. The outlet of the meter is to be sealed off and left
in a labelled condition. Which of the following best describes the
scope of work permitted under the CMA2LS certification?
A) Installing the meter and connecting the outlet to the internal
installation pipework
B) Installing the meter, testing it for tightness, purging it, and
leaving the outlet sealed and labelled
C) Installing the meter and commissioning all downstream appliances
D) Installing the meter and exchanging the meter regulator for a
higher-capacity unit
Rationale: The correct answer is B. CMA2LS permits the installation of
domestic gas meters up to 6 m³/h where the outlet is sealed off and
labelled, with no connection to internal installation pipework. This
includes tightness testing and purging. Option A is incorrect because
connecting outlet pipework is outside the scope of CMA2LS. Option C
is incorrect because commissioning appliances is not permitted under
CMA2LS. Option D is incorrect because regulator exchange is not part
of the limited scope.
Q2: During a tightness test on a new meter installation, the pressure
gauge shows a drop of 0.5 mbar over a two-minute test period with a
test volume of 0.02 m³. According to IGEM/UP/1C, which action
should the gas engineer take?
A) Accept the result as the pressure drop is within permissible limits
B) Repeat the test with a longer duration to confirm the reading
C) Investigate the installation for a leak as the pressure drop
,3
exceeds the permissible limit
D) Increase the test pressure and re-test to ensure accuracy
Rationale: The correct answer is C. For a test volume of 0.02 m³, the
permissible pressure drop is typically 0.25 mbar over two minutes. A
drop of 0.5 mbar exceeds this limit and indicates a leak requiring
investigation. Option A is incorrect because the drop exceeds
permissible limits. Option B is incorrect because repeating the test
will not resolve the leak. Option D is incorrect because increasing test
pressure is unsafe and not a recognised procedure.
Q3: An emergency control valve (ECV) is being installed for a
domestic gas meter. Which of the following siting requirements must
be met?
A) The ECV must be installed inside the property within 1 metre of
the meter
B) The ECV must be readily accessible, correctly labelled, and
operable without the use of tools
C) The ECV must be installed upstream of the meter and locked in the
open position
D) The ECV must be installed in a locked meter room accessible only
to the gas supplier
Rationale: The correct answer is B. The ECV must be readily accessible
to the consumer, correctly labelled, and operable without the use of
tools to allow emergency isolation. Option A is incorrect because the
ECV can be outside and its position depends on the meter location.
Option C is incorrect because the ECV must be operable, not locked.
Option D is incorrect because a locked room accessible only to the
supplier would not meet accessibility requirements.
, 4
Q4: A gas meter is to be installed in an internal meter compartment.
Which ventilation requirement must be satisfied according to
IGE/GM8?
A) The compartment must have ventilation openings at high level
only
B) The compartment must have ventilation openings at both high
and low level, with a minimum free area of 3% of the total floor
area
C) The compartment must be sealed to prevent gas accumulation
D) The compartment must be ventilated mechanically at a rate of 10
air changes per hour
Rationale: The correct answer is B. IGE/GM8 requires internal meter
compartments to have high and low-level ventilation with a minimum
free area of 3% of the floor area, equally distributed. Option A is
incorrect because both high and low-level ventilation are required.
Option C is incorrect because sealing would cause gas accumulation.
Option D is incorrect because mechanical ventilation is not the
standard requirement.
Q5: A gas engineer discovers that a newly installed meter regulator is
passing gas at a pressure of 30 mbar when it should be set to 21
mbar. Which action is most appropriate?
A) Leave the regulator as it is because the pressure will settle over
time
B) Adjust the regulator to the correct outlet pressure and re-check
the operating pressure
C) Replace the regulator immediately with a new unit
D) Increase the inlet pressure to compensate for the high outlet
pressure
CERTSure LLP NICEIC CMA2LS LIMITED SCOPE DOMESTIC GAS
METER INSTALLATION EXAM FULL PACKAGE QUESTIONS
ANSWERS AND RATIONALES 2026-27 LATEST UPDATED VERSION
INSTANT DOWNLOAD PDF..!!
INTRODUCTION
The Certsure LLP NICEIC CMA2LS Limited Scope Domestic Gas Meter Installation Exam is a specialised
assessment designed to evaluate a candidate's competence in the safe installation of domestic gas meters with
a capacity not exceeding 6 m³/h, where the meter outlet is sealed off and labelled. This exam is a critical
milestone for gas engineers, meter installers, and new entrants to the gas industry who wish to gain
certification under the Accredited Certification Scheme (ACS) and register with the Gas Safe Register. The exam
format consists of multiple-choice and scenario-based questions covering gas safety legislation, emergency
actions, tightness testing, purging, meter regulator checking, and the correct positioning of emergency
isolation controls. This exclusive question bank has been meticulously crafted to mirror the difficulty and
structure of the actual assessment, covering all core competencies required for the CMA2LS certification. By
engaging with these advanced, application-level questions, you will move beyond rote memorisation and
develop the critical safety reasoning necessary to pass your exam and work competently in the field.
CORE DOMAINS TESTED
1. Gas Safety Legislation and Standards: The Gas Safety (Installation and Use) Regulations, British
Standards (BS 6400), IGEM standards, and the scope and limitations of the CMA2LS certification.
2. Gas Emergency Actions and Procedures: Responding to gas escapes, use of emergency notices and
warning labels, and the correct procedure for isolating gas supplies in emergency situations.
3. Installation of Pipework and Fittings (Meter Installation): Pipework within the meter installation,
selection of fittings, support and protection requirements, and connection methods.
4. Tightness Testing and Purging: Strength testing, tightness testing procedures, permissible pressure
drops, direct purging of meter installations, and safety precautions during purging.
5. Checking and Setting Meter Regulators: Operating principles of meter regulators, checking regulator
performance, adjusting outlet pressure, and identifying regulator faults.
6. Unsafe Situations, Use of Emergency Notices and Warning Labels: Classification of unsafe situations
(ID, AR, etc.), correct use of warning labels and notices, and procedures for dealing with unsafe
installations.
7. Operation and Positioning of Emergency Isolation Controls and Valves: Siting requirements for
emergency control valves (ECVs), meter inlet valves (MIVs), accessibility, labelling, and operation.
8. Ventilation Requirements for Gas Meters: Ventilation of meter enclosures and compartments,
internal meter locations, and compliance with IGE/GM8 and related standards.
9. Meter Installation Site Assessment: Checking the intended installation site, assessing suitability, and
identifying potential hazards.
10. Labelling, Recording, and Handover: Labelling of meter installations, recording installation details,
and handover procedures to the responsible person.
,2
QUESTIONS 1-200
Q1: A gas engineer is installing a primary domestic gas meter with a
capacity of 6 m³/h. The outlet of the meter is to be sealed off and left
in a labelled condition. Which of the following best describes the
scope of work permitted under the CMA2LS certification?
A) Installing the meter and connecting the outlet to the internal
installation pipework
B) Installing the meter, testing it for tightness, purging it, and
leaving the outlet sealed and labelled
C) Installing the meter and commissioning all downstream appliances
D) Installing the meter and exchanging the meter regulator for a
higher-capacity unit
Rationale: The correct answer is B. CMA2LS permits the installation of
domestic gas meters up to 6 m³/h where the outlet is sealed off and
labelled, with no connection to internal installation pipework. This
includes tightness testing and purging. Option A is incorrect because
connecting outlet pipework is outside the scope of CMA2LS. Option C
is incorrect because commissioning appliances is not permitted under
CMA2LS. Option D is incorrect because regulator exchange is not part
of the limited scope.
Q2: During a tightness test on a new meter installation, the pressure
gauge shows a drop of 0.5 mbar over a two-minute test period with a
test volume of 0.02 m³. According to IGEM/UP/1C, which action
should the gas engineer take?
A) Accept the result as the pressure drop is within permissible limits
B) Repeat the test with a longer duration to confirm the reading
C) Investigate the installation for a leak as the pressure drop
,3
exceeds the permissible limit
D) Increase the test pressure and re-test to ensure accuracy
Rationale: The correct answer is C. For a test volume of 0.02 m³, the
permissible pressure drop is typically 0.25 mbar over two minutes. A
drop of 0.5 mbar exceeds this limit and indicates a leak requiring
investigation. Option A is incorrect because the drop exceeds
permissible limits. Option B is incorrect because repeating the test
will not resolve the leak. Option D is incorrect because increasing test
pressure is unsafe and not a recognised procedure.
Q3: An emergency control valve (ECV) is being installed for a
domestic gas meter. Which of the following siting requirements must
be met?
A) The ECV must be installed inside the property within 1 metre of
the meter
B) The ECV must be readily accessible, correctly labelled, and
operable without the use of tools
C) The ECV must be installed upstream of the meter and locked in the
open position
D) The ECV must be installed in a locked meter room accessible only
to the gas supplier
Rationale: The correct answer is B. The ECV must be readily accessible
to the consumer, correctly labelled, and operable without the use of
tools to allow emergency isolation. Option A is incorrect because the
ECV can be outside and its position depends on the meter location.
Option C is incorrect because the ECV must be operable, not locked.
Option D is incorrect because a locked room accessible only to the
supplier would not meet accessibility requirements.
, 4
Q4: A gas meter is to be installed in an internal meter compartment.
Which ventilation requirement must be satisfied according to
IGE/GM8?
A) The compartment must have ventilation openings at high level
only
B) The compartment must have ventilation openings at both high
and low level, with a minimum free area of 3% of the total floor
area
C) The compartment must be sealed to prevent gas accumulation
D) The compartment must be ventilated mechanically at a rate of 10
air changes per hour
Rationale: The correct answer is B. IGE/GM8 requires internal meter
compartments to have high and low-level ventilation with a minimum
free area of 3% of the floor area, equally distributed. Option A is
incorrect because both high and low-level ventilation are required.
Option C is incorrect because sealing would cause gas accumulation.
Option D is incorrect because mechanical ventilation is not the
standard requirement.
Q5: A gas engineer discovers that a newly installed meter regulator is
passing gas at a pressure of 30 mbar when it should be set to 21
mbar. Which action is most appropriate?
A) Leave the regulator as it is because the pressure will settle over
time
B) Adjust the regulator to the correct outlet pressure and re-check
the operating pressure
C) Replace the regulator immediately with a new unit
D) Increase the inlet pressure to compensate for the high outlet
pressure
