PAT TESTING EXAMPLES
Examples of PAT testing Class 1 and Class 2 appliances and power cords
During PAT Testing, different tests are carried out depending on the Class of equipment. PAT Testing of appliances is slightly differently to that of power cords. Here we look at some examples of PAT Testing.
If the appliance does not have a rating plate then it is failed straight away. The lack of a rating plate presents the tester with many problems, It is impossible to determine the Class of the appliance, the power taken as well as any approval standards that the appliance has been designed to.
Appliances with a double box symbol are of Class 2 construction. In this case, just the Insulation Resistance test is carried out during PAT testing.
Appliances without the double box symbol are of Class 1 construction and need the Earth Continuity and the Insulation Resistance tests carried out during PAT testing. If the appliance is in a metal enclosure, like an electric fire or a washing machine, then it is relatively easy to clip the Earth Test lead to a metal point. These appliances are classified as Class 2 metal.
Class 1 plastic appliances are totally enclosed in plastic. It is not possible to carry out the Earth Continuity test on these appliances as there is no Earth Point to clip onto. In this case, one needs to do just the Insulation Resistance test when PAT testing is carried out. It is important to make appropriate notes as to why the earth Continuity test was not carried out.
Power cords such as Computer IEC cables or mains extension leads need three tests carried out on them during PAT testing. These are the Earth Continuity, Insulation Resistance and the Polarity test. The latter test checks that the Live and Neutral wires are correctly connected.
class 2 chopper
toaster class 1
power cord
extension lead
