Discuss Cable size when burying in the UK Electrical Forum area at ElectriciansForums.net
Perhaps as important, what is the nature of the load?2 × 70.0 three core?
That is unusual as above what is the nature of the supply.
EV car chargers 22kw each x 6As westward10 said ''See Table 4D4A of BS7671.'' Still need to know what type of loads you are expecting to supply.
Is your intention 3 on each cable?EV car chargers 22kw each x 6
Yes, 22Kw EV charge points are 3 phase. The only one I've seen in the flesh required a neutral.I am no expert on EV chargers but I would be very surprised if 22kW units are not 3-phase, and also need neutral, so you would be looking at 4C cable for the feeds.
HIAlso check what the OCPD requirements are, it might be each charger needs its own protection so you would be needing either 6 cables from the DB, one per charger, or a sub-DB at the end to distribute power.
I am no expert on EV chargers but I would be very surprised if 22kW units are not 3-phase, and also need neutral, so you would be looking at 4C cable for the feeds.
Also are the two cables you mention going in separate ducts, or shared duct? Then you have to allow a grouping factor as well as the buried-method de-rating.
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