ACS CCN1 Core Gas Safety Initial Assessment

The ACS CCN1 assessment is for existing gas professionals whose CCN1 qualification has run out for longer than 1 year or candidates who have undergone specialist training (GGFO course certification holders) towards gaining the ACS Core Gas Safety (CCN1) qualification or fully qualified NVQ heating or plumbing operatives wishing to acquire domestic gas qualifications.

This is a two day course, as follows:

Day 1: Theory assessments
Day 2: Practical assessment tasks


Practical Assessment

  • Candidates are required to demonstrate safe working practice and competence upon installing, commissioning and servicing domestic gas installations and appliances to include:
  • Visual inspection of gas installation pipe work, flues and appliances (identification of faults and defects).
  • Inspection and calculation of ventilation for open flue, flueless and room sealed appliances in various multiple scenarios.
  • Full gas tightness testing on both low and medium pressure installations.
  • Purging procedures for metric and imperial metered gas installations.
  • Checking the standing pressure, meter regulator working pressure and appliance inlet supply pressure.
  • Checking and setting appliance burner pressures and conducting gas rates on both imperial and metric gas meters.
  • Visually checking burner flame pictures for complete and incomplete combustion.
  • Testing and confirming the shut-down times for flame supervision devices fitted to various appliance burners.
  • Checking and confirming catchment spaces and conducting a flue flow test and a spillage test on open flue appliances.
  • Checking and testing flue and case seals on room sealed appliances.
  • Identification and classification of the Gas Industry Unsafe Situations and Procedures for various scenarios.
  • Demonstrating the safe and effective jointing of gas pipes to include soldered and compression fittings on copper tube and screwed joints on steel tube.
  • Demonstrating the correct use of the Temporary Earth Continuity bond and conducting an Air Test to ensure integrity.
  • Calculating the correct size of gas pipe required (in accordance with current standards) for a theoretical scenario.
  • Demonstrating the correct use of the electronic flue gas analyser by conducting a series of performance tests on open flue, flueless and room sealed gas appliances.
  • The identification, operation and testing of gas appliance safety devices and controls. Explain by written descriptor their function and operation and identify any controls not operating correctly.  

Entry Requirements

Candidates must already hold CCN1 or have undergone specialist gas training such as the Guild of Gas Fitters Course (for new entrants) or are fully qualified plumbing/heating engineers who are able to provide evidence of on-site gas related experience. Prior to undertaking ACS CCN1 initial assessment for the first time as a new entrant to the gas industry, candidates are required to hold a current and valid full plumbing qualification (C&G/NVQ 6089 or equivalent) or the ERS (GGFOD1) Guild of Gas Fitters Certificate or equivalent  relevant qualification via another approved awarding body. Copies of plumbing certificates MUST be submitted to the centre when applying for assessments. PLEASE NOTE: NVQ 6129 plumbing technical certificates are not deemed as acceptable for application for CCN1 initial assessment. The route for such applicants is via the ERS (GGFOD1) Guild of Gas Fitters Course or equivalent via another awarding body. Regardless of these pre-requisite requirements, all applications for CCN1 initial assessment as a new entrant to the gas industry MUST be supported with a record of gas related field experience of a minimum of 25 weeks prior to assessment taking place. This is because the registration body GAS SAFE REGISTER, require each and every new entrant to provide a minimum of 25 weeks relevant field experience of working on gas installations prior to applying for registration for the CCN1 Core Gas Safety qualification. A log book detailing experience and relevant hours may be presented as evidence to GAS SAFE REGISTER providing it is endorsed by a GAS SAFE registered installer who has personally and directly supervised all the related gas work experience being submitted. Such evidence must be checkable, legible and legitimate otherwise the application for assessment and registration will be rejected. Log books for recording such evidence are available at this center.


The assessment will take two days (8:15am start both days)

Additional Information

Upon the first day of attendance all candidates must bring with them, 2 recent passport size photographs, their National Insurance Number, relevant NVQ plumbing/heating qualifications and workplace log containing a minimum of 25 weeks of domestic gas related experience. The assessment may not take place without these requirements.

Fees £400.00 (payable in advance)


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