Answer ... The parties shall bear the costs of arbitration, which are determined by the arbitral tribunal (Article 18). When making their decision on costs, which is a necessary part of the arbitral award, the arbitrators should consider all facts of the case, including the outcome. The parties also have the duty to advance the costs of arbitration upon an order of arbitral tribunal to that effect (Article 18(3)).
Answer ... There are no restrictions in this respect under the Arbitration Act. The determination of costs is generally left to the arbitrators.