Canon 382. §1 A person who is promoted to the episcopate cannot become involved in the exercise of the office entrusted to him before he has taken canonical possession of the diocese. However, he is able to exercise offices which he already held in the same diocese at the time of his promotion, without prejudice to can. 409 §2.

§2 Unless he is lawfully impeded, one who is not already consecrated a Bishop and is now promoted to the office of diocesan Bishop, must take canonical possession of his diocese within four months of receiving the apostolic letters. If he is already consecrated, he must take possession within two months of receiving the apostolic letters.

§3 A Bishop takes canonical possession of his diocese when, personally or by proxy, he shows the apostolic letters to the college of consultors, in the presence of the chancellor of the curia, who makes a record of the fact. This must take place within
the diocese. In dioceses which are newly established he takes possession when he communicates the same letters to the clergy and the people in the cathedral church, with the senior of the priests present making a record of the fact.

§4 It is strongly recommended that the taking of canonical possession be performed with a liturgical act in the cathedral church, in the presence of the clergy and the people.