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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

    Imagine this scenario.

    New build house with a combi-boiler that has wireless controls, the copper gas pipe does not have a Main Protective Bond because the supply is through a plastic pipe and the heating system has plastic pipework as well.

    The homeowner buys an inverter generator and then disconnects the boiler electric supply flex from the installation and fits a plug to the flex to supply it from the generator.

    The boiler will not run because the flame sensor completes its circuit through the body of the boiler and the earthing system.

    So the home owner fits a neutral/earth link inside the new boiler plug.

    Will the boiler run and if so why, conversely if not why; and will the boiler or generator be damaged doing so?

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  • 0

    Imagine this scenario.

    New build house with a combi-boiler that has wireless controls, the copper gas pipe does not have a Main Protective Bond because the supply is through a plastic pipe and the heating system has plastic pipework as well.

    The homeowner buys an inverter generator and then disconnects the boiler electric supply flex from the installation and fits a plug to the flex to supply it from the generator.

    The boiler will not run because the flame sensor completes its circuit through the body of the boiler and the earthing system.

    So the home owner fits a neutral/earth link inside the new boiler plug.

    Will the boiler run and if so why, conversely if not why; and will the boiler or generator be damaged doing so?

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