In alt.engineering.electrical Thomas Tornblom wrote:

| Residential power in Norway is normally 230V three phase btw, instead
| of 400V three phase. Their 230V outlets are two phase and ground
| instead of one phase, neutral and ground. Their three phase outlets
| therefore are blue instead of red and have four prongs instead of five.

Is this the system where the voltage is 133 volts relative to ground and 230
volts between phases (and formerly 127 volts relative to ground and 220 volts
between phases)?

If they still use that system, then I'm interested in buying a UPS designed
for that. But it is my understanding it is phased out in cities and hard to
find anymore in rural locations.

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