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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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    I am old enough to have driven a pickup with a Positive Ground and chrome bumpers, I was taught to keep the bumpers away from those on another vehicle when using jump leads to start it or sparks could fly.

    I know it’s now very rare, but vehicles can be positive earthed and with a First Fault on some wiring systems the vehicle body and chassis could be at a higher voltage without any one getting a shock.

    Hence I am very wary of people making an “earth” connection when there was never intended to be one.

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  • 0

     

    I am old enough to have driven a pickup with a Positive Ground and chrome bumpers, I was taught to keep the bumpers away from those on another vehicle when using jump leads to start it or sparks could fly.

    I know it’s now very rare, but vehicles can be positive earthed and with a First Fault on some wiring systems the vehicle body and chassis could be at a higher voltage without any one getting a shock.

    Hence I am very wary of people making an “earth” connection when there was never intended to be one.

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