N.J. Stat. § 17:14A-88
A safe shall weigh at least 750 pounds empty, or be securely anchored to the premises where located. The body shall consist of steel, at least one inch in thickness, either cast or fabricated, with an ultimate tensile strength of at least 50,000 pounds per square inch and be fastened in a manner equal to a continuous 1/4 inch penetration weld having an ultimate tensile strength of at least 50,000 pounds per square inch. The door shall be made of steel that is at least 1 1/2 inch in thickness and at least equivalent in strength to that specified for the body, and the door shall be equipped with a combination lock, or time lock, and with a relocking device that will effectively lock the door if the combination lock or time lock is punched. One hole not exceeding 1/2 inch diameter may be provided in the body to permit insertion of electrical conductors, but shall be located so as not to permit a direct view of the door or locking mechanism.
N.J.S. § 17:14A-88