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What earthing arrangement is this and will RCDs operate

vantech

Hi, 

I found the below image on an IET forum. 

electrical.theiet.org/.../

The voltage potential between L&N (well, line and line) is 230V, with the voltage between each of these lines and the CPC sitting at 115V. 

The article states this is a TN-S earthing arrangement if a reference to earth is made using a rod, however I note there is no N-E relay/bond. 

Can anyone confirm this is correct and that this is indeed a TN-S earthing arrangement? 

Will RCDs connected to the output of the supply operate correctly, I presume so because current can flow between line(s) and CPC. 

Thanks. 

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    Despite the caption on Figure 4 I'd not consider that to be floating

    I agree. Not only does N-PE link rule it out of being a separated or IT system the fact it's connected to an extraneous-conductive-part (by definition, something that has a potential) means it can't be floating. It's more tike the off-planet TN-S systems - e.g. on mobile units.

       -  Andy.

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  • 0

    Despite the caption on Figure 4 I'd not consider that to be floating

    I agree. Not only does N-PE link rule it out of being a separated or IT system the fact it's connected to an extraneous-conductive-part (by definition, something that has a potential) means it can't be floating. It's more tike the off-planet TN-S systems - e.g. on mobile units.

       -  Andy.

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