Rules and Guidelines
Want to participate in the discussions? Please read our Community Rules and Guidelines. Need some help? Visit Support and Answers.

  • State Not Answered
  • Locked Locked
  • Replies 12 replies
  • Subscribers 32 subscribers
  • Views 2231 views
  • Users 0 members are here
Options
You may also be interested in
This discussion is locked.
You cannot post a reply to this discussion. If you have a question start a new discussion

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

 


 

Parents
  • 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.


Reply
  • 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.


Children
No Data

Join us to get the best from IET EngX.

Joining EngX lets you personalise your experience so you stay up to date on the topics that interest you, plus you’ll be able to make connections who are looking to collaborate, exchange ideas and more.

Join us Not now

Community Rules & Guidelines