The frequency of re-testing depends on the type of environment the appliance is being used in. For instance, computers that sit on desk and the cords are rarely disconnected require less testing than hand tools that are constantly being transported, moved from site to site and repeatedly plugged in and unplugged. The frequency of testing is clearly detailed in the standard known as AS/NZS 3760:2010. There is also a standard that especially relates to the construction industry. AS/NZS 3012;2010 These standards set down a lot of requirements for the correct testing that is required to ensure workplace safety.