ACS CCN1 Core Gas Safety Initial 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.

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