PAT testing - what, when and why?

PAT testing (Portable Appliance Testing) is necessary to test electrical appliances and devices for their safe use. The purpose of these tests is to prevent electrical accidents in the workplace that could lead to fires and other hazards. Although security problems can often be detected visually, it is important that the instruments are tested on the PAT, as some defects can only be detected by testing the equipment. A full test checks the device grounding, wire polarity, and insulation resistance. At the end of the PAT test, the device will be marked as “passed” or “failed”, which must be recorded.

Simple answer

Frequently Asked Question - What does my business need to test PAT? Any device that needs to be connected to a generator or a fixed installation must be tested on a PAT.

7 categories of devices that may require PAT testing:

• Stationary appliances

• IT technology

• Portable equipment

• Mobile appliances

• Stationary appliances

• Cable and chargers

• Hand tools

Technical bit

These electrical appliances can be further assigned to class 1, 2 or 3 appliances.

Class 1 devices: this type of device is the most dangerous because it has only basic insulation, so rely on the ground for protection.

Class 2 appliances: This type of appliance has greater insulation, making it safer because it does not rest on the ground.

Class 3 devices: These are the safest devices since they have a low voltage, however, their chargers and wires must pass the PAT test.

For example, a cordless power tool should not be tested for PAT, as it does not connect directly to an electrical outlet. However, the charger that it uses to charge the device’s battery should be checked. Similarly, some larger appliances, such as dishwashers, may need PAT testing if they are connected to a power source.

Your responsibilities

There are no established rules regarding how often a device should pass PAT testing. However, enterprises are legally responsible for the safe maintenance of all electrical equipment to ensure the safety of their employees. London Property Inspectorates can check all of your electrical appliances to ensure they comply with the 1989 Electricity Law and you are confident that your facilities are safe to use. At the London Property Inspections, we recommend that all electrical appliances be inspected annually to maintain the highest standard of safety.