Article 89

Any person sufficiently interested in a suit between other parties may intervene therein at any time before judgment. The intervention is allowed whenever it is based on a right given by law or whenever the applicant has an interest that is related to the action of the original parties and the applicant is so situated that disposition of the action might impair or impede the applicant’s ability to protect that interest, unless the applicant’s interest is adequately represented by the existing parties.

The intervention shall be made by filing a separate statement containing all the grounds which justify such person in intervening.

Where the intervention is allowed, the intervening party shall be served with a copy of the statement of claim and defense and the proceedings shall be stayed until the parties have been served with a copy of the statement of the intervening party.

Where for a reason attributable to the intervening party, his statement is not served within the time fixed by the court, he shall be deemed to have withdrawn his intervention.