ACS Core Commercial Heating & Appliances

ACS - Core Commercial Heating - Natural Gas Safety and Appliances

Qualification Details

ACS - Core Commercial Heating - Natural Gas Safety and Appliances

The following training and assessment packages are certificated by Logic Certification Ltd to industry led standards

Title Content type
Code: COCN1 (plus appliance and pipework codes) or CODNCO1 changeover
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.

COCN1 (or a suitable changeover) is required for any operative wishing to work on non-domestic gas installations and commercial heating and hot water appliances. In addition, the operative must hold the relevant appliance element to the work they wish to undertake.

Assessment overview:

The candidate will be assessed in the following areas:-

  • Gas safety legislation and Standards
  • Gas emergency actions and procedures
  • Installation of pipework and fittings
  • Tightness testing and purging (Natural Gas installations and total IV < 0.035 m³) appliance pipework connections
  • Unsafe situations, use of emergency notices and warning labels for pipework
  • Operation and positioning of emergency isolation controls and valves
  • Products and characteristics of combustion
  • Checking and/or setting meter regulators (and supply/appliance regulators)
  • Unsafe situations, use of emergency notices and warning labels
  • Operation and checking of appliance gas safety devices and controls
  • Re-establish existing gas supply and relight appliances
  • Ventilation
  • Installation of chimneys



For the initial assessment candidates must meet the entry requirements as laid out in guidance note 8 for category 1, 2, and 3 entrants (see ACS scheme rules).

For the re-assessment candidates must have held the element previously - if this has expired within 12 months of the assessment date the initial assessment must be undertaken.

The COCN1 core commercial gas safety certificate has an equivalence to a Level 3 qualification and satisfies the same criteria leading to a certificate of competence recognised by the Gas Safe Register.



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