New Jersey Statutes Title 34. Labor and Workmen's Compensation 34 § 15-81

a. At least ten days' notice in writing of the election to terminate such contract is given by registered mail by the party seeking cancellation thereof to the other party thereto; and

b. Until like notice shall be filed in the office of the commissioner of banking and insurance, together with a certified statement that the notice provided for by paragraph “a” of this section has been given; and

c. Until ten days have elapsed after the filing required by paragraph “b” of this section has been made.

The provisions “b” and “c” of this section shall not apply where the employer has replaced the contract to be canceled by other insurance, and notice of such replacement has been filed with the Commissioner of Banking and Insurance. In such event the notice required by provision “a” may, if given by the insurance carrier, recite as the termination date the effective date of the other insurance, and the contract shall be terminated retroactively as of that date. No notice of cancellation of any such contract need be filed in the office of the Commissioner of Banking and Insurance where the employer is not required by any law of this State to effect such insurance.