Gas, Oil, Plumbing, Electrical, Renewable Energy, Solid Fuel and Street Works Training and Assessment Centre CSCS Cards and Online Courses
Gas, Oil, Plumbing, Electrical, Renewable Energy, Solid Fuel and Street WorksTraining and Assessment CentreCSCS Cards and Online Courses 

Assessment Information



The ACS assessment scheme covers a range of sectors within the downstream gas industry: domestic, commercial, liquid petroleum gas (LPG) and emergency service provider (ESP).

Depending upon the work area specified, the candidate would normally undertake a ‘core’ assessment e.g. CCN1 or COCN 1 followed by one or more appliance or specialised assessments e.g. CENWAT or CIGA1. Changeover assessments are also available.




For the initial ACS assessments, candidates must satisfy the entry requirements defined by the Assessment Scheme Rules (Category 1, 2 and 3).

Candidates wishing to take re-assessment must have held the assessment element previously – if this element has expired within 12 months of the assessment date, it will be necessary to take the initial assessment.

Any applicants that fully meet the prerequisite requirement to undertake ACS assessments do not need to undertake refresher training. Should any applicant wish to undertake refresher training it may better prepare them for the ACS assessment process.


Further Information


Assessments normally consist of a combination of practical and theory examinations.


Expiry Information


ACS certificates are normally valid for 5 years. On expiry, candidates are eligible to take re-assessment. The re-assessment can be taken up to 6 months prior to the expiry date of the initial qualification without losing out (MOT Style). Previous certificates must be presented to the assessment centre as evidence of holding the initial qualification


Useful Information

Gas Safety Regulations

Scheme Rules


Training Materials



Training is NOT a pre-requisite for assessment although most candidates do elect training prior to the assessment.

Training materials are available


Course Duration   Domestic core gas CCN1 

Training and Asessment   3 days 

Assessment only    2 days 



Domestic Natural Gas Safety.pdf
Adobe Acrobat document [623.0 KB]
2. ACS.pdf
Adobe Acrobat document [655.4 KB]
4. Domestic Natural Gas Safety Manual.pd[...]
Adobe Acrobat document [649.3 KB]

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