Commercial to Domestic Changeover (COCDN:1)

Commercial to Domestic Changeover (COCDN:1)

To enable experienced commercial operatives to work in domestic dwellings.

Entrants must have a current CCCN:1 qualification.

Course Duration
4 days (2½ days training and 1½ days assessment).

Maximum Number
8 persons

Training Aids
Lecture notes, audio visual presentation and a range of domestic gas appliances and models.

Written and practical test in line with ACS scheme requirements.

On successful completion of the course candidates will receive CCN:1 Core Gas Safety qualification.

Additional Information
This tailored assessment for domestic work will cover changes which a commercial operative will encounter when working in a domestic dwelling.

Meeting the needs and expectations of service users is of the highest priority to our staff. Therefore if you have any concerns or wish to make a comment about the service please contact:


On successful completion of this course learners will be able to demonstrate competence in relation to:

  • Gas Safety Legislation
  • Gas emergency actions and procedures
  • Characteristics of combustion
  • Ventilation
  • Installation of pipework and fittings
  • Tightness testing / purging
  • Checking and/or setting meter regulators
  • Identifications of unsafe situations
  • The operation of and positioning of emergency isolation controls and valves
  • Emergency notices and warning labels
  • Checking and setting appliance burner pressures and gas rates
  • The operation and checking of appliance Gas safety devices and controls
  • Flueing / chimney standards
  • Flue / chimney testing
  • Installation of open, balanced and fan assisted flue / chimney assemblies
  • Re-establish existing gas supply and relight appliances


  • Gas safety regulations, British Standards and manufacturer’s instructions
  • Emergency actions, procedures, labels and warning notices
  • Unsafe situations, landlord checks and related documentation
  • Combustion, gas rates, burner/ installation pressures
  • Tightness testing, purging and relighting appliances
  • Pipework and fittings
  • Operation of appliance gas safety devices and controls
  • Ventilation
  • Flueing/chimney standards, installation and testing