N.J. Stat. § 40:23-25
The board of chosen freeholders shall not exercise jurisdiction under the provisions of this article in any city, the governing body of which may have adopted the provisions of an act entitled "An act to authorize cities in this state to provide by ordinance for the regulation and inspection of electrical wires, appliances and currents for furnishing light, heat and power in certain cases, and to fix the penalty for the failure to comply with the provisions of such ordinance and to make it unlawful when an ordinance for such regulation is passed by any city in this state, for insurance companies, and those engaged in furnishing electricity for light, heat or power purposes, to charge for inspection covered by such ordinance," approved March twenty-ninth, one thousand nine hundred and twelve (L.1912, c. 271, p. 477).
N.J.S. § 40:23-25