43 Pa. Stat. § 213.7
If the mediator, appointed by the Governor, is satisfied that the labor dispute cannot be settled within thirty (30) days of his intervention, the mediator shall within such time secure from, and it shall be the duty of each of the parties to furnish to him, a written statement of the best offer of each party for the settlement of the labor dispute. The mediator shall thereupon make a report to the Governor who shall require the Pennsylvania Labor Relations Board forthwith to conduct an election among all of the employes in the bargaining unit involved in the labor dispute on the question "Shall the employer's offer be accepted?" Such election shall be by secret ballot. If a majority of those voting on the question shall vote in favor of accepting the offer, then such offer shall become effective, and if the same involves a dispute relating to wages, hours or other conditions of employment that should be adjusted by collective bargaining, the effective period shall date from the date of the appointment of the mediator by the Governor and shall continue effective for one year from that date. In default of a majority vote in favor of accepting the offer the vote shall constitute a vote in favor of arbitration.
A full statement of the offer as made by each party shall be furnished simultaneously to each eligible voter at such election and to the employer or his representative.
43 P.S. § 213.7