Hi all,
Test and Tag is the industry term for the Safety Inspection and Testing of Electrical Appliances, under the Australian Standard AS/NZS 3760:2003.
In NSW, the relevant legislation is the Occupational Health and Safety Act 2000, and the OH&S Regulation 2001, Sections 64 and 65:
"(1) An employer must ensure that any risk of injury from electricity at a place of work is eliminated or, if elimination is not reasonably practicable, the risk is controlled. " Etc, etc.
There are heaps of local companies that do "Test and Tag". But you 'd be best off sticking with one of the bigger companies.
There is lots of info on the whole subject at www.sydneyappliancetesting.com.au
Assuming you are in NSW (and not Queensland where the rules are more strict) you would need to have any appliances, leads, powerboards etc which are in a "hostile" environment inspected, tested and tagged. Hostile can mean wet. moist, dusty, hot, rough, exposed to harsh treatment from staff or the public.
If you are in an industrial setting, say construction or manufacturing, then just about everything needs to be tested and tagged regularly, and an appliance test log/ asset register/ database / logbook kept for all items that were inspected or tested.
Best of luck.