Its also only good for the moment its tagged.
Could well develope a fault 2 seconds later
Could develop a fault one second later, or it may never develop a fault in the rest of its lifetime. But the point is that it is the seller's legal obligation (if he is a business) to tag and test the device. It is the law ;
http://www.esv.vic.gov.au/Electricity-Professionals/Electrical-equipment-and-appliances/Sale-and-supply-of-second-hand-equipment
6 months QLD from memory.. mind you this ONLY applies if the machine is sited. It is though the obligation of the seller to ensure that product conforms to electrical safety act.. which as correctly stated requires test and tag by qualified personnel ( restricted licence or above).
Once its in home use, it no longer requires 6 month T&T.. its ONLY if sited
