Canon 455. §1 The Episcopal Conference can make general decrees only in cases where the universal law has so prescribed, or by special mandate of the Apostolic See, either on its own initiative or at the request of the Conference itself.
[NB see Authentic Interpretation of canon 455 §1, 5.VII.1985]

§2 For the decrees mentioned in §1 validly to be enacted at a plenary meeting, they must receive two thirds of the votes of those who belong to the Conference with a deliberative vote. These decrees do not oblige until they have been reviewed by the
Apostolic See and lawfully promulgated.

§3 The manner of promulgation and the time they come into force are determined by the Episcopal Conference.

§4 In cases where neither the universal law nor a special mandate of the Apostolic
See gives the Episcopal Conference the power mentioned in §1, the competence of each diocesan Bishop remains intact. In such cases, neither the Conference nor its president can act in the name of all the Bishops unless each and every Bishop has given his consent.

§1. Episcoporum conferentia decreta generalia ferre tantummodo potest in causis, in quibus ius universale id praescripserit aut peculiare Apostolicae Sedis mandatum sive motu proprio sive ad petitionem ipsius conferentiae id statuerit.

§2. Decreta de quibus in §1, ut valide ferantur in plenario conventu, per duas saltem ex tribus partibus suffragiorum Praesulum, qui voto deliberativo fruentes ad conferentiam pertinent, proferri debent, atque vim obligandi non obtinent, nisi ab Apostolica Sede recognita, legitime promulgata fuerint.

§3. Modus promulgationis et tempus a quo decreta vim suam exserunt, ab ipsa Episcoporum conferentia determinantur.

§4. In casibus in quibus nec ius universale nec peculiare Apostolicae Sedis mandatum potestatem, de qua in §1, Episcoporum conferentiae concessit, singuli Episcopi dioecesani competentia integra manet, nec conferentia eiusve praeses nomine omnium Episcoporum agere valet, nisi omnes et singuli Episcopi consensum dederint.