Classification and Types of Appliances
The IEE's code of practice for In-service Inspection and Testing of Electrical Equipment 3rd Edition states that there are 5 classifications of electrical appliances these are class 0, 01, 1, 2, 3. Classes 0 and 01 are extremely rare and not commonly used.
Class 1 Equipment
Basic insulation and relies on an earth for protection and will receive an Earth Continuity test and Insulation test. Examples of Class 1 equipment are Kettles, Toasters, Irons, Microwaves, Electric Heaters, Fridges, Freezers, Washing Machines and Tumble Dryers etc.
Class 2 Equipment
Has supplementary insulation and therefore does not rely on an earth for protection and is easily identified by the double square symbol and will receive an insulation test. Examples of Class 2 equipment are Televisions, DVD Players, Lamps, Power Tools, Hair Dryers, etc.
Class 3 Equipment
Relies on protection from a SELV (Separated Extra-Low Voltage) supply, which is usually less than 50vac or 120vdc and therefore does not require testing. However the power supply will be tested.
Information Technology Equipment (IT)
Not manufactured to BS60950 will receive a soft earth continuity test of 100mA and an insulation test (at a reduced voltage of 250vdc) or a touch current test. Examples of IT Equipment are Computers, Visual Display Units, Printers and Scanners etc.
Appliances With Detachable Cables
E.g. IEC cables or Fig 8 cables are to be tested as a separate item and also tested attached to the appliance.
Types of Electrical Appliances
Electrical appliances can be categorised into the following types of appliances.
These appliances weigh less than 18kg and can easily be moved from one place to another when in operation e.g. Kettle, Toaster, Food Processor etc.
These appliances weigh less than 18kg and are usually fitted with either wheels or casters to enable the operator to move the appliance easily when required to perform work tasks e.g. Mobile Compressor, Power Washer, Oil Filled Heaters etc.Hand Held Appliances – these appliances are designed to be held in the hand under normal operational use e.g. Hair Dryers, Irons, Hand Blender, Power drill etc.
These appliances weigh in excess of 18kg and are not provided with a means of carrying e.g. Washing Machine, Tumble Dryer, and Chest Freezer etc.
These appliances includes such items as Computers, Mains Powered Telecommunications Equipment, Printers, Plotters, Photo copiers etc.
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