Article 234 TEC

The Court of Justice shall have jurisdiction to give preliminary rulings concerning:
(a) the interpretation of this Treaty;
(b) the validity and interpretation of acts of the institutions of the Community and of the ECB;
(c) the interpretation of the statutes of bodies established by an act of the Council, where those statutes so provide.

Where such a question is raised before any court or tribunal of a Member State, that court or tribunal may, if it considers that a decision on the question is necessary to enable it to give judgment, request the Court of Justice to give a ruling thereon.

Where any such question is raised in a case pending before a court or tribunal of a Member State against whose decisions there is no judicial remedy under national law, that court or tribunal shall bring the matter before the Court of Justice.