Why does the USA use 110V and UK use 230-240V?

Re:Why does the USA use 110V and UK use 230-240V? by Kirby64 on Tuesday August 29, 2023 @04:49PM (#37313851)

I'm referring to the cost of the wiring, not raw copper stock price. Also, I mean the cost of the wire from the breaker panel to the HVAC unit. On average, I'd assume that the wire run is at least 50 feet. 100 feet wouldn't be unusual. 100 feet of single-wire 10 gauge THHN (enough to run most HVAC units here) would be ~$60. That also doesn't include any additional cost by upsizing certain things (conduit) that may add.

To note, as mentioned, copper is not the only cost here. You also need another pole to your breaker, which adds cost. Plus busbar upgrades. And more.

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Re:Why does the USA use 110V and UK use 230-240V? by timc3 on Tuesday August 29, 2023 @06:36PM (#37315051)

3 phases is cheaper than single line for delivering a houses power. You can get away with 3 smaller cables than the larger cables needed for 110V or 230V low voltage single phase at a particular amperage.

The cost of termination of 3 phases is insignificant compared to the cost of the rest of an electrical system in a modern home.

It’s the better system.

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