N.J. Stat. § 34:1-44
Any citizen of the State having had at least 5 years' experience as engineer in the maintenance and operation of steam boilers, or as boiler maker, or as inspector for an insurance company specializing in the inspection and insurance of boilers and licensed to do business within the State, who shall satisfactorily pass the examination held by the examining board as required by section 34:1-45 of this Title, and who shall meet the requirements of the Civil Service Commission with regards to character, fitness and physical condition, shall receive from the commissioner a certificate of competency which shall authorize him to inspect boilers, pressure vessels and refrigeration plants within the State and which shall make him eligible for examination by the Civil Service Commission for the position of boiler, pressure vessel and refrigeration plant inspector in the department.
N.J.S. § 34:1-44