Gas Safe ACS - Accredited Certification Scheme Meters and Regulators Questions and Answers

Question 1

An engineer is installing a new U6 diaphragm meter in a purpose-built surface-mounted meter box on the external wall of a domestic property.
According to BS 6400-1, what is the minimum required horizontal clearance between the meter box regulator vent and an opening window?

Accepted Answer

300 mm

Answer

100 mm

Answer

500 mm

Answer

1000 mm

Question 2

What is the primary function of an Over-Pressure Shut-Off (OPSO) device fitted within a domestic gas meter regulator assembly?

Accepted Answer

To shut off the gas supply if the downstream pressure rises to an unsafe level.

Answer

To reduce the mains pressure to the required appliance operating pressure.

Answer

To shut off the gas supply if the downstream pressure drops too low.

Answer

To act as a secondary, finer filter for the gas supply.

Question 3

An engineer is assessing an existing gas meter installation in a domestic property and finds the Emergency Control Valve (ECV) is located in a kitchen cupboard, behind a fixed shelf stacked with tins and jars. According to the Gas Safety (Installation and Use) Regulations 1998, why is this positioning non-compliant?

Accepted Answer

The ECV is not in a readily accessible position for operation.

Answer

The ECV must be located within 2 metres of the property's main entrance.

Answer

The ECV is not painted bright yellow for easy identification.

Answer

The ECV must be fitted inside a purpose-built, ventilated housing.

Question 4

While checking the working pressure at a meter test point, you record a reading of 18.5 mbar with all appliances operating. The nominal working pressure for Natural Gas is 21 mbar. According to the Gas Industry Unsafe Situations Procedure (GIUSP), how should this situation be classified and managed?

Accepted Answer

At Risk (AR) - Turn off the supply at the ECV, apply a warning notice, and advise the customer to contact the Gas Transporter.

Answer

Immediately Dangerous (ID) - Disconnect the supply and report to the Gas Transporter.

Answer

Not to Current Standards (NCS) - Note the reading on the job sheet and advise the customer it is slightly low.

Answer

Acceptable - The pressure is within a safe operating tolerance.

Question 5

Before an engineer begins to physically remove an existing gas meter for replacement, what is the most critical safety check that must be performed immediately after closing the Emergency Control Valve (ECV)?

Accepted Answer

A check to ensure the ECV is not passing gas (let-by test).

Answer

A full tightness test of the entire installation.

Answer

A visual inspection of all downstream appliances for signs of corrosion.

Answer

A continuity test of the main equipotential bonding.

Question 6

Which of the following describes a key responsibility of a Gas Safe registered engineer when commissioning a new SMETS2 smart gas meter installation?

Accepted Answer

Demonstrating the functionality of the In-Home Display (IHD) to the customer.

Answer

Setting the customer's monthly budget on the In-Home Display (IHD).

Answer

Configuring the customer's home Wi-Fi router to connect to the communications hub.

Answer

Providing the customer with a comparison of different energy tariffs.

An engineer is installing a new U6 diaphragm meter in a purpose-built surface-mounted meter box on the external wall of a domestic property.According to BS 6400-1, what is the minimum required horizontal clearance between the meter box regulator vent and an opening window?

An engineer is installing a new U6 diaphragm meter in a purpose-built surface-mounted meter box on the external wall of a domestic property.
According to BS 6400-1, what is the minimum required horizontal clearance between the meter box regulator vent and an opening window?