Wires Connecting Electrical Appliances
Posted in Appliances on February 15th, 2012 by admin – Comments Off
All electrical appliances using mains voltage have to provide at least 2 levels of protection to the user. This is to ensure that if one of the protection layers were to fail, there is the back-up of the second layer still in place. This makes electrical equipment very safe to use.
Depending on how exactly the protection is provided, electrical appliance are put into 5 Classes of equipment construction which are Class I, II, III, 0, 01. Of these the most important are Class I & II. For completeness all the Classes are described below.
Here the protection is provided by a combination of insulation and use of the mains Earth. It is best shown by referring to an electric fire that has been taken apart.
In the open plug the three wires connecting to the LIVE, NEUTRAL and EARTH pins. Inside the fire, the brown LIVE wire and the blue NEUTRAL wire connect to a plastic connector. The green/yellow Earth wire connects to the metal case of the fire.
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