sounds like the phase voltage of a three-phase 480V Y-connected supply....


> -----Original Message-----
> From: Douglas Butler [mailto:dbutler@IMETRIX.COM]
> Sent: Friday, July 27, 2001 11:50 AM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Re: [EE]: Transformerless PSU
>
>
> > malfunctioning solid state controllers that provided 120
> Vac to "Exit
> > Lamps" from a 277 Vac main in all the international airports
> > throughout the
> > free world! Prior to this project, I didn't know that the typical
> > international airport has 2,000 "Exit Lamps".
>
> What an odd voltage!  I design stuff for seaports all over
> the world but
> I have never run into 277Vac.  Is this some derivative of airplane
> wiring?
>
> Sherpa Doug
>
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