CCN1
The core domestic natural gas safety assessment under ACS. Most domestic gas engineers hold it and reassess every five years.
CCN1 covers core gas safety for domestic natural gas work. Appliance categories, such as boilers or cookers, are assessed separately.
Tickzu can remind you before your qualifications expire, so renewals are not missed.
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Sources
A plain-language explanation, not a technical procedure or legal advice. Follow the current regulations, industry procedures and manufacturer’s instructions.