N.J. Stat. Ann. § 48:3-48

On or before January 31 of each year, each public utility requiring the right of reasonable access to a customer's premises shall notify said customer by mail or other public means that no employee of said public utility shall have the right of reasonable access at set forth in section 1 of this act, unless he is wearing an identification badge. Each such public utility shall accompany said notice with a reproduction of an identification badge. The word "void" shall be stamped in large letters across the reproduction.