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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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  • 0

    Let’s go back to the original illustration, a bit long winded, but I’ll get there.

    If that is in a vehicle such as a lorry horse box with a 24 vDC system for the lorry electrics, a 12 vDC system for the leisure battery and equipment because the fridge and other appliances were made for recreational vehicles such as caravans and motor homes, then you add two 12 vDC batteries for a 24 vDC inverter that could presumably connected to both the 12 vDC and 24 vDC systems, the AC earth connection would be at +12 vDC to the chassis and everything grounded to it; and so would the earthed metalwork of the fridge and the other appliances?

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  • 0

    Let’s go back to the original illustration, a bit long winded, but I’ll get there.

    If that is in a vehicle such as a lorry horse box with a 24 vDC system for the lorry electrics, a 12 vDC system for the leisure battery and equipment because the fridge and other appliances were made for recreational vehicles such as caravans and motor homes, then you add two 12 vDC batteries for a 24 vDC inverter that could presumably connected to both the 12 vDC and 24 vDC systems, the AC earth connection would be at +12 vDC to the chassis and everything grounded to it; and so would the earthed metalwork of the fridge and the other appliances?

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