As used in this chapter, unless the context requires a different meaning:

“Employer” means any political subdivision of the Commonwealth, including any county, city, town, authority, or special district that employs fire protection employees except any locality with five or fewer paid firefighters that is exempt from overtime rules by 29 U.S.C. § 207 (k).

“Fire protection employee” means any person, other than an employee who is exempt from the overtime provisions of the Fair Labor Standards Act, who is employed by an employer as a paid firefighter, emergency medical services provider, or hazardous materials worker who is (i) trained in fire suppression and has the legal authority and responsibility to engage in fire suppression and is employed by a fire department of an employer or (ii) engaged in the prevention, control, or extinguishment of fires or response to emergency situations where life, property, or the environment is at risk.

“Law-enforcement employee” means any person who is responsible for the prevention and detection of crime and the enforcement of the penal, traffic or highway laws of the Commonwealth, other than an employee who is exempt from the overtime provisions of the Fair Labor Standards Act, and who is a full-time employee of either (i) a police department or (ii) a sheriff’s office that is part of or administered by the Commonwealth or any political subdivision thereof.

“Regularly scheduled work hours” means those hours that are recurring and fixed within the work period and for which an employee receives a salary or hourly compensation. “Regularly scheduled work hours” does not include on-call, extra duty assignments or any other nonrecurring and nonfixed hours.