53 Pa.C.S. § 2974: Limitation on powers of optional plan.

The optional plan of any municipality adopted in accordance with this subpart shall not give any power or authority to diminish any rights or privileges of any present municipal employee in his pension or retirement system. No municipality shall exercise any powers or authority beyond the municipal limits except those conferred by statute, and no municipality shall engage in any proprietary or private business except as authorized by the General Assembly.