UPACs with an installed power greater than 20.7 kW are subject to periodic inspections, which are carried out with the following periodicity:
- 10 years, when the installed capacity of UPAC is less than 1 MW;
- Eight years, in the remaining cases.
UPACs with an installed power greater than 20.7 kW are subject to periodic inspections, which are carried out with the following periodicity: