Sorry, I'm not being pedantic but standard US home supply is NOT two phaes
plus ground, it is still single phase 120-0-120 Vac with the 0 volt being
grounded and tied to the neutral line for each of the two anti-phase hot
lines.
The power is distributed around the area as three phase and each of those
three phases is then typically split between three properties at the
outdoor powerpole.
--
73 Chris Cox, N0UK, G4JEC
chr...@chris.org
On Sat, 18 May 2019, Jim Brown wrote:
> On 5/18/2019 4:28 PM, Clay Autery wrote:
> > 230VAC on 3 wires? Never knew they did 3 wire 220V.... I always
> > assumed it was still 2 hots and ground (plus an optional neutral).
>
> Two hots (phases) and ground is three wires. Single-phase power normally
> comes into a building in North America as two phases and a neutral. We
> connect a 240V load between the two phases, and a 120V load between one
> phase and a neutral. It's not unusual to feed a sub-panel with both
> phases, neutral, and ground so that the panel can feed both 120V and
> 240V loads. The key here is that loads must NEVER be connected between a
> phase and ground, ALWAYS between phases or between phase and neutral.
>
> You probably know that EU runs on 230/240V, wired phase, neutral, and
> ground.
>
> 73, Jim K9YC
>
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