Code of Practice for Light Trailers NZ STANDARDS NZS5467:1993

Section 8.1, Page 12

Every Trailer shall have a safety connection(s).

Section 8.2,  Page 13  

Safety connection (s) shall have a minimum breaking strength equal to two times the trailer Maximum Towing Mass.

Section 8.7,  Page 13

Safety connections shall be indelibly marked by the component manufacturer with their rating. The rating shall enable the minimum breaking load of the component to be identified.

NZ Standards copy purchased by HES NZ Ltd 21/04/2013 for clarification regarding "Safety Connections" and the required ratings and markings of the "Safety Chain" and "Shackle".