Because the OP is only running conduit for the drops so he can do the chases and make good beforehand. Through the floor/ceiling space it's not going to be in conduit I don't imagine.
If you do all the calculations including grouping, the CCC of 2 x 2.5mm² in conduit buried in plaster is slightly less than 20A and so doesn't really comply for a ring final. So you could only ever try to put 1 x 2.5mm² through, and this is pretty easy.
I will suggest that you run two 20mm or one 25mm conduit for ring circuits as getting 2x2.5mm² T&E into a 20mm tube from an awkward space is tricky. The same is true for more than 2x lighting cables.
If you do all the calculations including grouping, the CCC of 2 x 2.5mm² in conduit buried in plaster is slightly less than 20A and so doesn't really comply for a ring final. So you could only ever try to put 1 x 2.5mm² through, and this is pretty easy.
If you do all the calculations including grouping, the CCC of 2 x 2.5mm² in conduit buried in plaster is slightly less than 20A and so doesn't really comply for a ring final. So you could only ever try to put 1 x 2.5mm² through, and this is pretty easy.
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