Schedule for testing and tagging
Australian Standard AS/NZS3760-2010
AS3760 sets out the recommended schedule for inspecting electrical equipment. Appliances and leads should be checked before use, and checked regularly by a competent person as prescribed in schedule.
The interval i determined by the environment where the appliance is used and use for which it is being used.
Wet dusty or dirty areas require frequent inspection and testing.
Examples cooking laundry and construction will require more frequent testing than offices.
Where appliance is to be unplugged frequently and or dragged around and subject to abuse will require more testing.
Examples commercial cleaning requires more frequent testing than domestic applications.