Any electrical appliance that is fitted with a plug is required by the Electricity at Work Regulation 4 (2) to be tested on a regular basis to ensure that it is in a safe working condition.

There are two main types of appliance:-

Class I - Earth bonded equipment such as kettles, drills, microwaves

Class II - Double Insulated such as IT equipment, portable radios, printers

The testing process does depend on the type of appliance:

Testing Process	Class I Appliances	Class II Appliances
1. Visual Inspection
2. Earth Continuity
3. Insulation Test
4. Leakage test
5. Load test