Notwithstanding any other provisions of this act where representatives of units of guards at prisons or mental hospitals or units of employes directly involved with and necessary to the functioning of the courts of this Commonwealth have reached an impasse in collective bargaining and mediation as required in section 801 of this article¹ has not resolved the dispute, the impasse shall be submitted to a panel of arbitrators whose decision shall be final and binding upon both parties with the proviso that the decisions of the arbitrators which would require legislative enactment to be effective shall be considered advisory only.