3-phase power

[Jon Elson]

On 1/4/22 10:03 AM, Noel Chiappa via cctalk wrote:
>      > From: Scott Quinn
>
>      > I have seen some roads where the utility has 2 of the phases plus
>      > neutral going down them, not true 2-phase power, but 2 phases 120/240
>      > degrees apart with the third phase just not present.
>
>
>
> My house has something like that; the previous owner wanted '3-phase service'
> for machine tools (I think - could have been a compressor, or something) in
> his basement workshop, so they sold him a pseudo-3-phase service. I forget
> the exact details of how it works, but the 3rd phase is at 170V to neutral,
It should be 208V - see center grounded delta online.  240 * 
sin 60 degrees = 207.8 V.
Jon