Can. 137

§1. Ordinary executive power can be delegated both for a single act and for all cases unless the law expressly provides otherwise.

§2. Executive power delegated by the Apostolic See can be subdelegated for a single act or for all cases unless the delegate was chosen for personal qualifications or subdelegation was expressly forbidden.

§3. Executive power delegated by another authority who has ordinary power can be subdelegated only for individual cases if it was delegated for all cases. If it was delegated for a single act or for determined acts, however, it cannot be subdelegated except by express grant of the one delegating.

§4. No subdelegated power can be subdelegated again unless the one delegating has expressly granted this.