34 Pa. Code § 123.302
For claims for injuries suffered on or after June 24, 1996, an insurer may demonstrate an employee's earning power by providing expert opinion evidence relative to the employee's capacity to perform a job. The evidence shall include joblistings with agencies of the Department, private job placement agencies and advertisements in the usual employment area within this Commonwealth. Partial disability applies if the employe is able to perform his previous work, or can, considering the employe's residual productive skill, education, age and work experience, engage in any other kind of substantial gainful employment in the usual employment area in which the employe lives within this Commonwealth. If the employe does not live within this Commonwealth, the usual employment area where the injury occurred applies.
34 Pa. Code § 123.302