ACS Domestic Gas


Suitable for plumbing and heating engineers that hold a Level 2 NVQ in Plumbing and have been working alongside an experienced GasSafe registered engineer.

Course programme:

The candidate will be assessed in the following areas:

Gas safety legislation and standards

Gas emergency actions and procedures

Products and characteristics of combustion (inc. combustion performance analysis)


Installation of pipework and fittings

Tightness testing and purging

Checking and/or setting meter regulators

Unsafe situations

Emergency notices and warning labels

Operation and positioning of emergency isolation controls and valves

Checking and setting appliance burner pressures and gas rates

Operation and checking of appliance gas safety devices and controls

Chimney Standards

Chimney inspection and testing

Installation of open balanced and fan assisted chimneys

Re-establish existing gas supply and relight appliances

Inspect, test, commission and maintain gas appliances

For the initial CCN1 assessment candidates must meet the entry requirements as laid out in guidance note 8 for category 2, and 3 entrants

Delivery Method: 5 days training and 3-5 days assessment.

Assessment: Assessment is carried out using a variety of assessment methods including multiple choice, short written response and scenario questions and observed practical assessment.

Expiry: 5 years. Candidates can undertake the re-assessment of any element up to 6 months early without losing any time (MOT Style). Previous certificates must be produced at the time of assessment as evidence.