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Formal visual inspections

​This is a process of simply inspecting the appliance, the cable and the plug for any obvious signs of damage. According to the HSE, this process can find more than 90% of faults.

PAT testing

At periodic intervals, it is essential to test the portable appliances to measure that the degree of protection to ensure that it is adequate. At these intervals, a formal visual inspection is carried out and then followed by PAT testing. Note the inside of the plug MUST be checked unless it is moulded or there is an unbroken seal covering the screws (bad internal wiring or an unsuitable fuse would cause the item to be classed as dangerous).

The tests that an individual must carry out to declare an item electrically safe is dependent on the class of construction. Some of these tests are:

• Earth Continuity
• Insulation Resistance
• Polarity of Wiring
• Earth leakage 
• Microwave Radiation leak test
• Current Leakage
• Microwave radiation testing power plug replacement

Power plug replacement

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Tags for passed and failed appliances

​Class I - Single insulated wiring, which requires an earth connection. There is no symbol for a Class I product so if a rating plate has no symbol on it then it is usually Class I.

Class II - Double insulated wiring, therefore no need for a earth lead. Class II is indicated by double box.

Class III - These are appliances that are supplied at a low voltage (usually called Separated Extra Low Voltage) which must be less than 50 V. These appliances are supplied with a transformer supply that is also marked