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It's one reason why branched radials are that bit more tricky to work with, and why many folk avoid installing them, even if we do have the IET's blessing to install them. Personally, I have a branched 4mm 32amp radial supplying my kitchen sockets, pretty much as Richard has described. I wouldn't have installed it this way if rewiring from scratch, but as I added a bank of sockets to one side of the kitchen and left the existing sockets in place on the other side, it was the only way to do it without making a mess. Richard has described things pretty much bang on, the 'main' supply cable will be subject to all the voltage drop from both branches but as the circuit has two 'ends' I needed to calculate it twice. Actually it wasn't much of an issue in my example, cos it was an extremely short cable run, but you get my gist!