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PME Multiple Supplies Metal Frame

fiftyhertz
Hi All,


Wondering if someone can help, looking at the design of 5 metal sheds which will inevitably have a PME supply from NPG from a local TX. I know that the DNO will not allow more than one PME supply into this building due to circulating currents, so i am thinking of maybe placing a Ryefield board and cut out in either a landlords store within the building or in a separate feeder pillar and then distributing  to each unit in cabling with a separate neutral & bond for incoming services and a separate PME bond for the frame and connect to an earth bar within the pillar. Basically, the same as a private resi building but with a steel structure. Does this sound like a reasonable solution as upfront RCDs doesnt sound too appealing to a couple of potential tenants.


Whilst we are on the subject, has anyone put a ryefield and cut out inside a feeder pillar?


Thankyou for your help.
  • 0
    I know that the DNO will not allow more than one PME supply into this building due to circulating currents

    It might be worth double-checking that with your DNO. I know some DNOs are now happy to provide an earth terminal to multiple customers within a common steel structured building - as they avoid circulating currents by supplying each customer using a separate N & PE (SNE) cable from a common point outside (which is in turn supplied by a CNE cable in the normal way). It's still PME, but the earthing is arranged to avoid diverted N currents flowing through the building structure between customers.


       - Andy.
  • 0
    Andy, 


    Many things for the advice you were 100% correct. For other peoples benefit, the Ryefield solution was also acceptable, just not as simple.


    Thanks

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