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Connecting Multiple Bemco/Ryefield Boards

GHEC
Ok I have a new build project where one Bemco/Ryefield board is not large enough to cover all apartments. 


I will need to install 3 to cover the number of outgoing ways required.


My questions is this. Given that there is one incoming bulk supply, what options are there to split it between the three? I know Lucy do an MSDB with a vertical busbar. Would the DNO accept daisy chaining these together? Or should we use a busbar chamber and tap-off to each board?


Any advice would be gratefully received.
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    John Peckham:

    Not in UKPN land since they disowned the un-metered network inside the building.


    No metering before the panel board, or on smaller installations a Ryfield board. Just done a design for a small block of flats. Supply head to main isolator to Ryfield to supply 6 flats. and a landlords DB. No meter before Ryfield.


    Bigger installs say to 5 blocks of flats supply from transformer to panel board with MCCBs. MCCBs un-metered supply to Ryfields in each block via underground cabling. One supply for tenant's supplies then a separate  supply for landlords metered in each block. Separate primary metered supply to LSS MCCB panel in different location.


     




    Makes sense, suppose the BNO can always lock away the tenants panel board and restrict access. 


    Interesting seeing different IDNO approaches to these installations now the DNO's don't take ownership of rising and lateral sub-mains cabling within multi occupied buildings. Some wont let you take another primary metered supply to LSS in different location, they instead make you take the secondary supply from live side of the primary LV switchboard similar to what you would do for a sprinkler to supply the LSS, Others have no problem jointing into the primary supply before it comes into the building to provide the secondary supply via cut out which would be my preference as it remove the single point of failure at the primary intake.  


    Also, interested to understand why an IDNO uses so many fuses i.e BEMCO to series 8 cutout to fused switch. Id have thought it would be acceptable to only have the fuse to protect the 25mm SWA to each apartment within the BEMCO or worst case if a fuse is required outside of the sealed BEMCO use 1 fuse in the cut out or fused isolator.  

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  • 0

    John Peckham:

    Not in UKPN land since they disowned the un-metered network inside the building.


    No metering before the panel board, or on smaller installations a Ryfield board. Just done a design for a small block of flats. Supply head to main isolator to Ryfield to supply 6 flats. and a landlords DB. No meter before Ryfield.


    Bigger installs say to 5 blocks of flats supply from transformer to panel board with MCCBs. MCCBs un-metered supply to Ryfields in each block via underground cabling. One supply for tenant's supplies then a separate  supply for landlords metered in each block. Separate primary metered supply to LSS MCCB panel in different location.


     




    Makes sense, suppose the BNO can always lock away the tenants panel board and restrict access. 


    Interesting seeing different IDNO approaches to these installations now the DNO's don't take ownership of rising and lateral sub-mains cabling within multi occupied buildings. Some wont let you take another primary metered supply to LSS in different location, they instead make you take the secondary supply from live side of the primary LV switchboard similar to what you would do for a sprinkler to supply the LSS, Others have no problem jointing into the primary supply before it comes into the building to provide the secondary supply via cut out which would be my preference as it remove the single point of failure at the primary intake.  


    Also, interested to understand why an IDNO uses so many fuses i.e BEMCO to series 8 cutout to fused switch. Id have thought it would be acceptable to only have the fuse to protect the 25mm SWA to each apartment within the BEMCO or worst case if a fuse is required outside of the sealed BEMCO use 1 fuse in the cut out or fused isolator.  

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