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What is the difference Between a TT & TNS Earthing system?

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تاريخ النشر: 2014/10/20
LABIB KOOLI
من قبل LABIB KOOLI , Director of the Sectoral Center for Training in Hotel Technologies at Southern Hammamet , Tunisian Vocational Training Agency (ATFP)

TT: Transformer neutral earthed and frame  earthed. 

In this earthing systems, the supply source has a directconnection to earth

All exposed conductive parts of the installation also are connected to an earth nelectrode.

 

A TN-S earthing system has seperate neutral and protective conductor throught out the system

The supply source is directly connected to earth.

All exposed conductors parts of an installation are connected to a protective conductor PE via the main earthing terminal of the installation 

Waseem Shamieh
من قبل Waseem Shamieh , Head Of Electrical Department , Abdoun For real Estate

TT : the source and the load separately connected to earth, there is no connection between earth and neutral too.

 

TN: the source connected to earth and the load is connected to the same earth

there is TN-C where common cable is used for earth and neutral, TN-S separate neutral and earth but same as source's earth, TN-C-S there is common point for earth and neutral but they both have cables.

Hossam fayed
من قبل Hossam fayed

TT  System , the neutral is earthed at Transformer side only ,  but in TNS  the neutral is earthed at load as well

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