63. If conciliation has not resulted in an agreement, the Board, at the request of an interested party, shall order arbitration of the dispute in the manner proposed or, if there is no proposal, in the manner it determines.
However, the Board may, if it considers it expedient in the circumstances, alter the proposed mode of arbitration, or act itself as arbitrator at the request of one of the parties.
Arbitration must begin and continue diligently and the Board may fix the delay within which the decision must be rendered.