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ISO Containers Earthing & Bonding - TNCS (PNB) Supply

Former Community Member
Former Community Member
I have a project to provide a 63A TP supply terminating with a Type B DB within an ISO container. Final circuits from the DB will supply industrial sockets located in the ISO via RCBO's and an external fan.

The ISO container is located on several concrete pads and internally is fully (wooden) boarded out.

The supply is TNCS PNB.

My current proposals are for a connection via a SWA supply cable (4c) and separate CPC, fed via a 63A Type C MCB.

The CPC will terminate onto a EMT.

The ISO container will have a main protective bonding conductor to the EMT using finely stranded cable. In addition bonding via flexible 'straps' will be provided to the doors.

I have not allowed to TT the installation due to the PNB supply.


Looking for advice on whether a local earth rod or ring earth electrode is the best option to earth the container locally and also the resistance figure to achieve.


Thanks Mike

 


 

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  • 0
    lyledunn:

    You can use the PME terminal with one condition being

    PME earthing facility shall not be used as the means of earthing for an installation falling within the scope of this section except where:

    (i) the installation is continuously under the supervision of a skilled or instructed person(s), competent in such work, and...

    I have visions of a Spark dressed as a palace guard marching up and down outside the container! Can someone expand on this exception?


    It's historical and related to BBC outside broadcast units I understand.


    Take a look at the proposed change to that Regulation in the Amendment 2 DPC.


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  • 0
    lyledunn:

    You can use the PME terminal with one condition being

    PME earthing facility shall not be used as the means of earthing for an installation falling within the scope of this section except where:

    (i) the installation is continuously under the supervision of a skilled or instructed person(s), competent in such work, and...

    I have visions of a Spark dressed as a palace guard marching up and down outside the container! Can someone expand on this exception?


    It's historical and related to BBC outside broadcast units I understand.


    Take a look at the proposed change to that Regulation in the Amendment 2 DPC.


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