A UPAC with an installed power of 350 W or less is not subject to prior control. UPACs with installed power greater than 350 W and less than or equal to 30 kW are subject to mere prior communication.
See No. 206 of October 25, 2019 Page 49 Diário da República, 1st series of August, in its current wording.
For more information on prior control, see DL no. 162/2019, of 25 October.