ban-all-sheds said:Stuffed, then. (anyway - isn't it 21.3A minimum?)
2.5mm² is rated at 23A in conduit.
But we know from his other questions that our supplicant has put two cable in his conduit, so there's a grouping factor of 0.8, making the rating of the cable 18.4A.
MarkG - looks like you have done something which will not pass inspection, does not comply with the wiring regulations and could be dangerous....
It's not that it's not allowed, but you didn't design it properly, and now it won't carry the current that you expect.Mark G said:I have rippped out all my old rubber which was in the existing conduit and replaced it with new and now I find that it's not allowed ?
Pretty sure it shouldn't, if the inspection is done properly, unless you reduce the rating of the MCB on the circuit. 25A would be my view, but it would be good to get that confirmed.Are you absolutely certain that this won't pass inspection ?
I don't think it would have helped - the cable would still be in conduit and would still be grouped....Would 25mm steel have been ok ?
Yes.I suppose 2 x 20 mm would rectify the situation ?
Mark G said:The original steel conduit was the imperial equivalent of 20mm and yes there was only one conduit carrying both cables to each socket.
Mark G said:Is it possible to route the return cable from the farthest socket back through the previous sockets so that the same conduit can be used for both tails of the run ?
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