Can. 525
© Libreria Editrice Vaticana Source: vatican.va
When a see is vacant or impeded, it belongs to the diocesan administrator or another who governs the diocese temporarily:
1/ to install or confirm presbyters who have been legitimately presented or elected for a parish;
2/ to appoint pastors if the see has been vacant or impeded for a year.
Read the whole title TITLE IIIThe Internal Ordering of Particular Churches 460–572