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the purpose of a ring is to share the load between both legs. e.g. cable rated at 27A (2.5mm in UK) with a ring circuit it almost doubles the current capacity. at the mid point a 30A load will share current 15A each leg. so cable is not overloaded. at other points on the ring, the sharing is proportional to the respective lengths of each leg. near 1 end, the short leg will carry more current than the longer leg, due to lower resistance.In the US, the ring circuit is a totally different concept to me, everything is wired radial.
As I investigated this, it seems it's used to insure proper voltage & amperage depending on where the home is located in proximity to a power station.
Am, I correct?
Stateside, using a ring circuit, the issue would be to make sure it's connected back to the correct leg @ CU (panel)! If not, that'd be a dead short.