CCN1 Gas Appliance Installation and Commissioning

Question 1

What is the minimum distance a room-sealed balanced flue terminal must be from an openable window or air vent?

Accepted Answer

300mm

Answer

150mm

Answer

600mm

Answer

1200mm

Question 2

Which document must be completed and left with the customer after commissioning a new gas boiler?

Accepted Answer

Benchmark commissioning checklist

Answer

Gas Safe registration certificate

Answer

Local authority building notice

Answer

CORGI registration form

Question 3

What type of gas appliance does NOT require a permanent air vent in the room where it is installed?

Accepted Answer

Room-sealed (balanced flue) appliance

Answer

Open-flued appliance rated above 7kW

Answer

Flueless catalytic space heater

Answer

Open-flued appliance rated below 7kW

Question 4

What is the correct standing (static) gas pressure for natural gas at a domestic meter outlet?

Accepted Answer

21 mbar

Answer

10 mbar

Answer

17 mbar

Answer

37 mbar

Question 5

Which primary legislation requires all gas work on domestic premises to be carried out by a Gas Safe registered engineer?

Accepted Answer

The Gas Safety (Installation and Use) Regulations 1998

Answer

The Health and Safety at Work Act 1974

Answer

The Gas Act 1986

Answer

The Building Regulations 2010

Question 6

Before commissioning a new gas appliance, what electrical checks must the engineer perform?

Accepted Answer

Check that the appliance is correctly earthed and that polarity is correct

Answer

Verify the supply voltage is exactly 230V

Answer

Confirm the circuit uses 2.5mm² cable throughout

Answer

Ensure a 30mA RCD protects the appliance circuit

Question 7

Why is checking the gas rate important during appliance commissioning?

Accepted Answer

To verify the appliance is consuming gas within its designed input

Answer

To detect gas leaks in the pipework

Answer

To test the accuracy of the gas meter

Answer

To set the correct thermostat calibration