(3)For the purposes of this section and of the Indian Limitation Act, 1908 (9 of 1908) an arbitration shall be deemed to be commenced when one party to the arbitration agreement serves on the other parties thereto a notice requiring the appointment of an arbitrator, or where the arbitration agreement provides that the reference shall be to a person named or designated in the agreement, requiring that the difference be submitted to the person so named or designated.