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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, at least in the N-E bond sense there is clear continuity, A truly floating system, in my mind at least would be able to pass an insulation test between L+N to E as say a shaver socket would. AKA "IT"

    The other kind of floating with a bond is TN- x without the terra-firma, so NE bond but no electrode or building steels. I'm not sure that figure is the best  example of one of those either. Are the extraneous parts serving as an adventitious  electrode ?

    Mike

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  • 0

    Despite the caption on Figure 4 I'd not consider that to be floating, at least in the N-E bond sense there is clear continuity, A truly floating system, in my mind at least would be able to pass an insulation test between L+N to E as say a shaver socket would. AKA "IT"

    The other kind of floating with a bond is TN- x without the terra-firma, so NE bond but no electrode or building steels. I'm not sure that figure is the best  example of one of those either. Are the extraneous parts serving as an adventitious  electrode ?

    Mike

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