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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?

  • 0

    As a 'mobile or transportable' unit, in some circumstances it's acceptable to use the chassis as if it were "Earth" and an electrode into the planet proper becomes optional. Section 717 of BS 7671 lists out quite a number of possibilities. We'd need some more detailed information about your system to be able to tell more I think (e.g. is there a N-PE link and/or an insulation monitor fitted).

       - Andy.

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