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Earthing system

Pompey boy

Recently mobile welfare cabins with integral generators were used on site.

Test sheets supplied gave the earthing system as IT. 

2 phase 3 wire

NO earth electrode was used when the suppliers tested before arrival on site.

On arrival on site an earth electrode was installed and the cabin was connected to this.

Is the cabin now a TT system?

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    2nd fault to Earth, the RCD will then operate.

    I'm not seeing how either - if both faults are downstream (to Earth or just exposed-conductive-parts) the two poles at the generator are still in balance.

    If all the exposed-conductive-parts are connected together and the two faults are on opposite poles, you might well get ADS - but it'll be though overcurrent protective device (or the generator stalling) rather than RCD.

       - Andy.

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  • 0

    2nd fault to Earth, the RCD will then operate.

    I'm not seeing how either - if both faults are downstream (to Earth or just exposed-conductive-parts) the two poles at the generator are still in balance.

    If all the exposed-conductive-parts are connected together and the two faults are on opposite poles, you might well get ADS - but it'll be though overcurrent protective device (or the generator stalling) rather than RCD.

       - Andy.

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