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Sunpower UK's Electronics Glossary - IEC Protection Classes
IEC Protection Classes: Used in the electrical appliance manufacturing industry to differentiate between the protective earth connection requirements of devices.
Class I
These appliances must have their chassis connected to electrical earth (ground) by an earth conductor. A fault in the appliance which causes a live conductor to contact the casing will cause a current flow in the earth conductor. The current should trip either an over current device or a residual current circuit breaker, which will cut off the supply of electricity to the appliance.
Class II
A Class 2 or double insulated electrical appliance is designed in such a way that it does not require (and must not have) a safety connection to electrical earth (ground).
Class III
Designed to be supplied from a SELV power source. The voltage from a SELV supply is low enough that under normal conditions a person can safely come into contact with it without risk of electric shock. The extra safety features built into Class 1 and Class 2 appliances are therefore not required.
This Electronics Dictionary is a free service provided by Sunpower UK, and includes an ongoing list of current electronics vocabulary in use today. Sunpower UK sells a bespoke product range of electronics power supplies suitable for all your power supply needs, be it large or small.
Last Amendment: 11/10/2006 11:30:03
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