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Cable calculations

MrJack96
Hi guys i wanted to calculate the maximum run when spuring of a ring final circuit is there any equations or is it just as simple as calculating VD to the furthest point in the ring and then VD to the end of the spur. The reason for the question is I want to spur of an existing socket using a 10meter run of 2.5 for an outside socket. Just want to Double check it’s sufficient 


thanks guys
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    The ring serves a room of approximately 20meters x 10 meters. It has only 3 x double RCD sockets. Protected by a BS88 type 2 fuse. ZS at the furthest point is 0.40ohms there is no Spurs on the circuit I was just going to come of the furthest socket at run a 2.5 to an outside RCD socket think it’s more like 8 meters from the furthest socket.
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    The ring serves a room of approximately 20meters x 10 meters. It has only 3 x double RCD sockets. Protected by a BS88 type 2 fuse. ZS at the furthest point is 0.40ohms there is no Spurs on the circuit I was just going to come of the furthest socket at run a 2.5 to an outside RCD socket think it’s more like 8 meters from the furthest socket.
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