N.J. Stat. Ann. § 45:16A-28

28. Notwithstanding any other provision of this act to the contrary, a licensed master plumber or a person with a Master HVACR license shall not perform any electrical work which has a potential of greater than 30 volts, involving the wiring of equipment used for heating, ventilating, air conditioning or refrigeration, except in the case of replacement installations as described in sections 2 and 27 of this act or as provided for in section 18 of P.L.1962, c.162 (C.45:5A-18).