No, I can just remember when is was in the news when the regulations got changed allowing home owners to do more of their own work.
As an electrician, I have seen some householders work, some was excellent, some was a fire hazard and some I am surprised the home owner is still alive !
When was that? The last major change to the Homeowner Code of Practice came in with the need for RCDs in 2004. The previous Code was dated 1993.
As an electrician you must have also seen shoddy work done by other electricians.
DIY work - updated in 2010: http://www.consumerbuild.org.nz/publish/diy/diylegal-electrical.php
but insurance companies can always argue that DIY work was not carried out correctly if it results in a fire etc, and potentially deny a claim based on negligence or faulty work