CoDNCO1 is the core Changeover from a Domestic to a Commercial core. As long as you hold a valid Domestic core (E.G CCN1) Then your CODNCO1 shall remain valid. This is the fastest route into commercial and industrial gas work as your Domestic core will cover many basic principles, this allows training to be specialised towards changeover learning modules.
The training will cover what you’ll need to know in order to understand the differences between Domestic and Commercial core gas safety. Training will show you how the changes differ upon testing and gas detection; also strength testing and purging of installations. The training also makes reference to the key differences between commercial appliances as opposed to domestic appliances and the varying tests and checks associated.