In a residential installation if I am installing an additional CU to feed a EV charger and the existing installation has not been inspected for over 10 years for example.
In my mind in this situation I am considering the installation to be everything connected to the existing DB plus the new DB and putting a label on the main DB showing last inspection date unknown and next inspection due immediately.
Is this the correct approach or should I be labelling each DB with a different date?