neb:John19612:. Oh, and forgot the more obvious problem: Since you need to fork out an arm and a leg to Standards NZ or whoever sells them, they're of limited use to anyone who doesn't already own a copy they can look up.
All of the necessary information is contained within AS/NZS 3010:2005
This is true, to a degree. It also assists with limiting access to information for those that don't have the technical qualifications and knowledge to use the information safely.