(a) General rule.--All contracts executed by any city which involve the construction or performance of any work involving the employment of labor shall contain a provision that the contractor shall accept and file with the city, proof of compliance with or exemption from the act of June 2, 1915 (P.L.736, No.338), known as the Workers' Compensation Act, insofar as the work covered by the contract is concerned.
(b) Certificate of exemption.--A certificate of exemption from issuance may be issued on the basis of either individual self-insurance or group self-insurance.
(c) Exception.--A contractor shall file with the city any proof that the Department of Labor and Industry, with respect to certain employees, has accepted the application to be excepted from the provisions of the Workers' Compensation Act on religious grounds.
(d) Violation.--Any contract executed in violation of this section is void.