Appliance classes, Appliance classes - Class 0, Appliance classes - Class I, Appliance classes - Class II, Appliance classes - Class III, Appliance classes - External link, Mains power plug, Electricity
In the electrical appliance manufacturing industry, the following IEC protection classes are used to differentiate between the protective-earth connection requirements of devices.
Appliance classes - Class 0.
These appliances have no protective-earth connection and feature only a single level of insulation. They were intended for use in dry areas. In most countries, the sale of Class 0 mains-voltage appliances is prohibited today, as a single fault could cause an electric shock or other dangerous occurrence ...
A Class II or double insulated electrical appliance is one which has been designed in such a way that it does not require (and must not have) a safety connection to electrical earth (US: ground).
The basic requirement is that no single failure can result in dangerous voltage becoming exposed so that it might cause an electric shock and that this is achieved without relying on an earthed metal casing. This is usually achieved at least in part by having two layers of insulating material surrounding ...
