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Cables Buried Direct

me1899
Hi All


Hope all are well.


I was wondering if I could ask for some advice on cables buried direct.


Basically I am looking at a proposal where 10No.35mm 3 core cables are to run from a Ryefield (60A fuses) in an external cupboard to flats about 50 odd metres away (internal runs about 20m).


Electrician is suggesting all 10 next to each other with no spacing at 600mm depth. 


I had a quick look for derating and saw that the tables in the Regs cover 6 cables max like that.


I would have thought that they could be split into 2 groups of 5 with a gap of say 125mm between and that would be OK since I am looking at the old BICC values of 154A (there are short ducted portions where entering/existing buildings).


Am I thinking right or is there something to consider further?


Regards


Muhammad

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  • 0
    Hi all


    Many thanks for responses all. 


    The cables are to be buried in earth outside. 


    Ryefield is fed by a 315A supply for 9 gas flats and 5 ev chargers. Bit weird and have queried. 


    The lengths of duct are a couple metres either end. 


    Also did not mention that the contractor wants for the duct runs to have 2 cables per duct. 


    The 10 cables are for flats. The EV charger canles are near the incomer position and follow a different route albeit they will have to cross under at one point. 


    Regards 


    Muhammad
Reply
  • 0
    Hi all


    Many thanks for responses all. 


    The cables are to be buried in earth outside. 


    Ryefield is fed by a 315A supply for 9 gas flats and 5 ev chargers. Bit weird and have queried. 


    The lengths of duct are a couple metres either end. 


    Also did not mention that the contractor wants for the duct runs to have 2 cables per duct. 


    The 10 cables are for flats. The EV charger canles are near the incomer position and follow a different route albeit they will have to cross under at one point. 


    Regards 


    Muhammad
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