[BC] 110 V DC

[Gary Glaenzer]

actually, the 277 V part was an offshoot of '480 V wye-connected' 3-phase

someone noticed that the NEC allowed 'adjacent devices with less than 300 V
potential differences' to be in the same box, and the 277 V ballast for
flourescents was born

and, since there is no 'high' or 'wild' phase, all positions in a breaker
panel can be used, not just 2 out of 3




----- Original Message ----- 
From: <nakayle at gmail.com>
To: "Broadcasters' Mailing List" <broadcast at radiolists.net>
Sent: Saturday, December 02, 2006 4:00 PM
Subject: Re: [BC] 110 V DC


> Most of the rest of the world used 230V for all single phase service
> which becomes 400V for 3-phase.  The higher voltage is more efficient,
> requires smaller wires and there is only one electrical system rather
> than the confusion of difference systems providing an asortment of
> voltages- 120,208,240,277,and 480 that we have here in the US.  (for
> those unfamiliar with 208 and 277- they are by-products of 3-phase 120
> and 480 systems and are common in commercial and industrial
> installations, not because they are particulaly useful but that's just
> the way 3-phase systems work- Volts x 1.732).
>
>  - Nat
>
> On 12/2/06, PeterH5322 <peterh5322 at rattlebrain.com> wrote:
> >
> > My utility, one of the largest in the country, had an average voltage of
> > 127.5, this which was for a nominal 120 volt system.
> >
> > 120, 240 and 480 are the U.S. standards.
> >
> > 115, 230 and 460 were earlier standards.
> >
> > And, 110, 220 and 440 before that.
> >
> > During the energy crisis, my utility experimented with lowering the line
> > voltage, initially all the way down to 110 volts.
> >
> > But, there were too many electric motor burnouts, and other failures, so
> > 115, and finally 117.5 was selected.
> >
> > We're still a 120, 240 and 480. nominal, country, however.
> > _______________________________________________
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