Retail and wholesale outlets have a testing and tagging & Residual Current Device (RCD) Testing requirement for electrical equipment under AS/NZS 3760:2010. The standard does not apply to demonstration stock in retail or wholesale outlets.
Depending on the risk analysis, use and location, the electrical plug-in equipment should be checked from every 6-months (e.g. workshop), 12 months (e.g. a registrar in the shop as it is open to abuse), up to 5 years (e.g. back office computer devices). Table 4 of the AS/NZS 3670 is a useful guide an indicative testing and inspection intervals for electrical equipment.
Electrical equipment installed at the height of 2.5 meters or higher above the ground, platform or floor, where there is no reasonable chance of a person touching the devices and coming into contact with the earth, does not need to be tested under the AS/NZS 3760 standard.
Besides the low voltage plug-in equipment, we also test the RCD (or safety switch). An RCD is a permanently wired circuit breaker that trips when a loss of current is detected. Most common in retail outlets are Type II RCD's of 30mA.
We measure the trip time with a PAT tester by sending through a test-current. The maximum tripping time of a type II 30mA RCD is 300ms. The newer models have a tripping time around 9 to 20ms.