(1) For the purpose of Article 14(1), where there are multiple parties as claimants or respondents and unless the parties have agreed to another method of appointment of arbitrators, the multiple claimants or the multiple respondents shall jointly appoint an arbitrator.
(2) If the parties have agreed that the arbitral tribunal shall be composed of a number of arbitrators other than one or three, the arbitrators shall be appointed according to the method agreed upon by the parties.
(3) The arbitral tribunal is deemed constituted when the appointment of the sole arbitrator or of the third arbitrator, in case of an arbitral tribunal, has been confirmed by PDRCI. PDRCI shall send a notice of the confirmation to the parties and the arbitral tribunal, expressly providing for the date of the arbitral tribunal’s constitution.
(4) In case of failure to constitute the arbitral tribunal for any cause under the Rules, PDRCI shall, at the request of any party, constitute the arbitral tribunal and in doing so may revoke any appointment or confirmation already made and appoint or reappoint each of the arbitrators and designate one of them as the Chair.