On Sunday 07 Dec 2003 2:44 pm, Tom Brinkman wrote: > I don't > know the situation in the UK, but here in the US power is 110v > per leg. Two legs on the same circuit (what you refer to as a > ring?) yields 220v for things like electric clothes dryers, > range, ovens, and furnaces. Usually those are dedicated circuits, > but all circuits are fused/circuit breaker protected for > different voltage and amperage.
Just in the interests of completeness. Not in the UK. Here everything runs on 240V (actually a bit lower recently, IIUC.) The circuits are built as rings purely to allow extra current to flow without heating the wires too much or having too great an earth resistance. In every case only one live wire comes into the property. The neutral is almost equivilant to the earth, (but may actually only be earth back at the transformer.) So there is no possibility of doubling the voltage as you describe. Industrial premises have the option of taking all three phases instead of one, with a voltage between the phases of 440V. Standard domestic sockets have a current rating of 13A, with the ring fuse being 15A. Lighting circuits are 5A. The cooker circuit is 20A. The whole house is protected by a 30A fuse sealed by the distribution company. (These are all IIRC, I'm not getting the torch out and looking now.) -- Richard Urwin
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