Class 1 and Class 2

Any appliance which plugs into the mains will be either Class 1 or Class 2

In simple terms, a Class 1 appliance has an earth connection, whereas a Class 2 appliance will have two layers of insulation protecting the user from the mains inside. Class 2 appliances are sometimes referred to as 'Double Insulated.'

PAT Testing

Some appliances do not need to be tested because they are 'Safety Extra Low Voltage' or 'Class 3'

Electrical Appliances

People are often confused as to what appliances should be PAT Tested - the simple answer is that 'if it has a plug on, it should be tested.'

Actually, it is more simple to explain that any appliance which has mains electricity going into it should be checked. This means that all computers, kettles, washing machines, firdges, microwave ovens, fax machines, printers, DVD players, radios, PA equipment, guitar amps, electric drills, angle grinders, jig saws, coffee machines, kettles, water coolers and photocopiers should be checked.

What about equipment which is fastened to the wall?

This would be regarded as 'fixed equipment' and should be wired directly to the mains. An example of this would be a wall heater, a big industrial machine, or an air-con unit built into the wall or ceiling. These do not come under the umbrella of PAT testing (although they are still electrical appliances) and so should be checked by an electrician.

What about Low Voltage Appliances?

Actually, you might be surprised to realise that appliances powered by the mains (230Volts in the UK) are actually called 'Low Voltage' appliances. But there are a growing number of appliances in use now which are Extra Low Voltage - usually around 9 or 12 Volts, and these include mobile phones, MP3 players, many IT devices and even some larger appliances such as computer monitors and printers. A laptop and a cordless power tool will also be Extra Low Voltage. This means that those appliances will NOT need to be regularly checked, unless there is a good reason why they need to be safe. However, the devices which power them, either the charger or the power supply will have mains going into it, and so will need to be checked. In the case of a laptop, the power supply (and also the power supply mains lead) will need to be checked, but there would not be a need to check the laptop itself.