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TPCP1 stands for Testing and Purging of Pipework (Domestic & Commercial) – Strength Testing, Tightness Testing and Purging up to 1 m³.

Brief Description:

This qualification is for gas engineers working on low-pressure gas pipework installations (up to 1 cubic metre in volume). It covers the procedures for:

• Strength testing – ensuring the pipework can handle pressure without leaks.
• Tightness testing – checking for leaks in the system once it’s installed.
• Purging – safely removing air or gas from pipework to avoid dangerous mixtures.

It’s typically required for those working on commercial or larger domestic gas installations and ensures safe commissioning and decommissioning of gas pipework.

EFJLP1 stands for Emergency First Joint Line Pipework (≤2 bar).

Brief Description:

This qualification is for gas engineers who install and work on the first joint of gas service pipework—that is, the section of pipework immediately after the emergency control valve (ECV), typically within a domestic setting, but it can also apply in other environments.

It covers:

• Installation of low-pressure pipework (up to 2 bar).
• Correct procedures for jointing, testing, and purging.
• Ensuring safety and compliance with emergency control and service pipework standards.

It’s particularly relevant for engineers working on emergency repairs or new gas supplies entering a property.

COMCAT2 stands for Commercial Catering Appliances – Gas Fired Deep Fat Fryers.

Brief Description:

This qualification is part of the Commercial Catering (COMCAT) suite, which certifies gas engineers to work on specific types of commercial catering equipment.

COMCAT2 specifically covers:

• Installation, commissioning, and servicing of gas-fired deep fat fryers.
• Understanding of safety devices, flame failure systems, and thermostat operation.
• Fault diagnosis and repairs specific to fryers used in commercial kitchens (e.g., restaurants, takeaways, etc.).
• Ventilation and combustion air requirements.

It’s essential for gas engineers working in the hospitality or foodservice industry, ensuring that commercial fryers are safe and compliant with gas safety regulations.

CODC1 stands for Changeover Domestic to Commercial Core Gas Safety.

Brief Description:

This qualification is for engineers who already hold a domestic core gas safety qualification (CCN1) and want to extend their scope to commercial gas work.

CODC1 covers:

• The differences between domestic and commercial gas systems, including pressures, pipe sizing, and appliance types.
• Commercial installation standards and safety checks.
• Ventilation and flueing requirements specific to commercial environments.
• Additional legislation and responsibilities for commercial premises.

It acts as a bridge qualification, so the engineer doesn’t have to take the full commercial core qualification (COCN1) from scratch—just the additional knowledge needed to safely work in commercial settings.

COCATA1 stands for Changeover Core Commercial to Core Appliance Testing & Assessment – Commercial Catering Appliances.

Brief Description:

This qualification is for engineers who already hold the commercial core gas safety qualification (COCN1) and want to extend their scope to include commercial catering appliances.

COCATA1 covers:

• The changeover knowledge required to safely install, service, and maintain gas appliances in commercial catering environments.
• Specific appliance categories like ovens, grills, fryers, and other catering equipment.
• Additional safety considerations such as combustion air, ventilation, interlock systems, and flueing in catering areas.

It’s essentially a conversion module, allowing a qualified commercial gas engineer to work on catering-specific installations.

TPCP1A stands for Testing and Purging of Pipework – Volume Over 1m³ (Non-Domestic).

Brief Description:

This qualification is an extension of TPCP1, specifically for larger commercial or industrial gas pipework systems with an installation volume exceeding 1 cubic metre.

It covers:

• Strength and tightness testing on larger gas installations.
• Purging procedures for pipework with a volume greater than 1m³, where risks and procedures differ significantly from smaller systems.
• Use of specialist purging equipment and techniques, including calculation of purge volumes and flow rates.
• Compliance with IGEM/UP/1 and IGEM/UP/1A standards (Industry guidelines for strength testing and purging).

Engineers working on large commercial or industrial gas systems (e.g., schools, factories, large plant rooms) would need this qualification.

ICPN1 stands for Installation of Commercial Pipework (First Fix).

Brief Description:

This qualification is for gas engineers installing commercial-sized pipework—specifically the first fix, which refers to the initial installation phase before appliances are connected.

It covers:

• Installation of low-pressure commercial gas pipework (up to 75mbar).
• Pipe sizing, routing, and material suitability.
• Compliance with regulations and standards for commercial environments.
• Bonding and earth continuity.
• Pressure drop allowances and the correct use of valves and supports.

It’s essential for engineers working on the infrastructure side of commercial gas systems, like plant rooms, mechanical rooms, or large buildings, before appliance connection and commissioning.

CODNCO1 stands for Changeover Domestic to Core Commercial Gas Safety – Non-Domestic.

Brief Description:

This qualification allows engineers who are already certified in domestic gas safety (CCN1) to transition into the commercial gas sector.

CODNCO1 covers:

• The core safety requirements for non-domestic (commercial) gas work, including commercial gas pressures, appliances, and installations.
• Key differences between domestic and commercial systems, such as pipe sizing, ventilation, flueing, and appliance types.
• Gas safety regulations specific to commercial environments, including workplaces and public buildings.
• Emergency procedures, tightness testing, and combustion analysis for commercial setups.

It’s essentially the commercial core gas safety qualification (COCN1), but streamlined for those with an existing domestic background—so no need to redo what’s already been learned in CCN1.

CIGA1 stands for Commercial Installation of Gas-Fired Appliances – Direct Fired Heating Appliances.

Brief Description:

This qualification covers the installation, commissioning, and servicing of direct-fired commercial heating appliances, such as:

• Warm air heaters (including cabinet and suspended types)
• Radiant tube or plaque heaters
• Direct-fired air handling units (AHUs)

CIGA1 includes:

• Appliance safety checks and operational testing
• Combustion analysis
• Ventilation and flueing requirements
• Fault diagnosis and repairs
• Compliance with commercial gas safety standards

It’s essential for gas engineers working in commercial buildings like warehouses, factories, sports halls, or large open-plan spaces where these types of heaters are used.