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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
    How on earth is he expecting to put them 600mm deep? Is there a duct in the wall? All sounds a bit odd. 35mm cables from 60A fuses sounds like a significant derating already, and one could also apply some diversity unless there is electric heating. Buried cables method 57 in concrete are rating C, so why not just spread them out? The short ducted sections may be ignored for derating unless filled with insulation.
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  • 0
    How on earth is he expecting to put them 600mm deep? Is there a duct in the wall? All sounds a bit odd. 35mm cables from 60A fuses sounds like a significant derating already, and one could also apply some diversity unless there is electric heating. Buried cables method 57 in concrete are rating C, so why not just spread them out? The short ducted sections may be ignored for derating unless filled with insulation.
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