CCN1 Unsafe Situations Procedure (RIDDOR) 2

Question 1

When an engineer identifies an Immediately Dangerous (ID) situation and the customer refuses to allow disconnection, what must the engineer do?

Accepted Answer

Turn off the appliance, attach an ID warning label, cap the supply, and report to the Gas Emergency Service on 0800 111 999

Answer

If a customer refuses disconnection of an Immediately Dangerous appliance, the engineer must turn off the appliance, attach an ID warning label, cap off the gas supply to the appliance where possible, and call the National Gas Emergency Service on 0800 111 999. The situation must also be reported under RIDDOR to the HSE.

Question 2

Which of the following situations would be classified as 'At Risk' (AR) under GIUSP?

Accepted Answer

An appliance with a flue that is incorrectly terminated but with no current evidence of fume spillage into the room

Answer

An incorrectly terminated flue with no current evidence of spillage would typically be classified as At Risk (AR). While not immediately spilling products of combustion, the incorrect termination means the flue could fail under certain conditions (e.g., adverse wind). A severed pipe or significant CO production would be ID classifications.

Question 3

Under RIDDOR, within what timeframe must a dangerous gas fitting be reported to the HSE?

Accepted Answer

As soon as is reasonably practicable

Answer

Under RIDDOR, a Gas Safe registered engineer must report a dangerous gas fitting to the HSE as soon as is reasonably practicable. There is no specific fixed deadline in hours, but it should be done promptly — typically the same day or as soon as the engineer has access to the online reporting system.

Question 4

What information must be recorded on a warning label attached to an unsafe gas appliance?

Accepted Answer

The engineer's Gas Safe registration number, date, and the classification of the defect (ID, AR, or NCS)

Answer

A warning label must include the engineer's name and Gas Safe registration number, the date of inspection, the classification of the unsafe situation (ID, AR, or NCS), details of the defect found, and a warning not to use the appliance. The label should be attached to the appliance in a visible location and must not be easily removed.

Question 5

An engineer servicing a gas fire finds the CO/CO₂ ratio is 0.006. What is the correct GIUSP classification?

Accepted Answer

Immediately Dangerous (ID) — the appliance must be disconnected immediately

Answer

A CO/CO₂ ratio of 0.006 exceeds the Immediately Dangerous threshold of 0.005 for a gas fire (the general ID threshold for room heaters). The appliance is producing dangerous levels of carbon monoxide and must be disconnected immediately, labelled as ID, and the situation reported under RIDDOR.

ACS CCN1 Practice Test

ACS CCN1 Practice Test

CCN1 Unsafe Situations Procedure (RIDDOR) 2