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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

 


 

  • Former Community Member
    0 Former Community Member
    Hello Andy, thanks for the response. A container has been selected as its a quick way of providing a space for the works and will probably stay in the same location until disposed of, so yes will consider using traditional methods, ie SWA cables to the sockets etc.. 

    The DNO transformer is for  the (remote) site only but as you state the DNO can alter the infrastructure.

    The container is around 60m away from the source with nothing surrounding it (above/below ground) and there is only an electrical connection required (ie no water etc)

    Thanks Mike.
  • Former Community Member
    0 Former Community Member
    Graham, re - the DNO may declare TN-S (usually older supplies), they have declared this on another similar supply to another area of the site.Mike

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