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Earthing: Any conducting part of a system which could conceivably become live under fault conditions and yet still be handled (eg: the external metal casing of electrical apparatus) MUST be earthed as a legal requirement   The reasons for this are: To prevent the accessible metal parts rising to a dangerous voltage under fault conditions (eg: such as a short circuit between the live conductors and casing) To ensure that a faulty circuit is automatically disconnected from the supply (by drawing sufficient current to blow the fuse or operate the circuit breaker or residual current device) CLASS 1 equipment (ie: all equipment designed with an earth) must be tested to ensure that it is properly earthed Bad or loose joints, rust or paint can cause the resistance to increase to a dangerous level   CLASS 2 Double-Insulated equipment is constructed in such a way to require no earthing Such equipment has the ‘double square’ logo and is categorised as ClASS 2 equipment "Double-Insulated" implies the use of two layers of insulation on all live parts Each layer of insulation being adequate to insulate and ensure no danger arising from insulation failure This arrangement avoids the need for any external metal work to be connected to earth Return to HOME page   All trademarks and rights belong to the OEM and are reproduced here for information purposes only

 

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