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PAT Testing Examples

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. This page looks at some examples of PAT Testing.


PAT Testing Power Cords

Most modern PAT testers have a handy IEC lead test facility. All one has to do during PAT Testing is to plug in both ends of the lead and test Earth Continuity, Insulation Resistance and Polarity.


One aspect of electrical appliances that tends to cause a lot of confusion is the question "What fuse should this appliance have?". In this article, we look at fuses in detail and give guidelines on how to work out the correct fuse for the appliance.

PAT Testing FAQs

Frequently asked questions about PAT Testing


Earth Continuity Test

This test is carried out on all Class I appliances during PAT Testing. The purpose of the test is to check that there is a good connection between the Earth pin on the plug and the case of the appliance. A good connection is defined as having a resistance of less than 0.1 ohms (or 100 milli-ohms).


Insulation Resistance Test

This test is carried out on Class I and Class II appliances during PAT Testing. The purpose of this test is to ensure that there is adequate insulation between the Live parts of the appliances and the user touchable metal parts. Adequate insulation is defined as greater than 1 M ohm for Class I appliances and 2 M ohm for Class II appliances.

Selling Used Electrical Items


It is important to inspect and carry out PAT Testing on used electrical appliances prior to offering them for resale. In addition to this there are other precautions that need to be taken and these are presented in this chapter.



Testing Microwave Ovens

In addition to PAT Testing, microwave ovens need to be tested for leakage as well as heating power. Details on carrying out these tests are presented in this chapter.


Wiring a Plug

Wiring a plug is not difficult but you would be surprised how often people get it wrong. A wrongly wired (or fused) plug puts everyone at risk from electric shock or fire. Eight simple steps to a well wired plug:

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