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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
    AJJewsbury:

    Will the container really be a 'mobile or transportable unit' as far as the wiring is concerned? E.g. is it likely to be moved elsewhere and just hooked up to another supply?

     


    717.1 (ii) - but I agree if it's not readily "transportable" then perhaps 717 doesn't apply - but it's still a metal-frame structure, and as the forum user known as UKPN has quite rightly stated in another thread along these lines recently, in some cases where PME conditions apply, particularly rural, it may well be best to follow the same rules as Section 717 in any case.


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  • 0
    AJJewsbury:

    Will the container really be a 'mobile or transportable unit' as far as the wiring is concerned? E.g. is it likely to be moved elsewhere and just hooked up to another supply?

     


    717.1 (ii) - but I agree if it's not readily "transportable" then perhaps 717 doesn't apply - but it's still a metal-frame structure, and as the forum user known as UKPN has quite rightly stated in another thread along these lines recently, in some cases where PME conditions apply, particularly rural, it may well be best to follow the same rules as Section 717 in any case.


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