[BC] to fluorescents

[Gary Glaenzer]

yes, but with 277 V, the requirement for barriers between adjacent switches
(as an example) does not come into play

I have no idea what other 'high voltage requirements' might be bypassed by
using 277 V, however


----- Original Message ----- 
From: "Mike McCarthy" <Towers at mre.com>
To: "Broadcasters' Mailing List" <broadcast at radiolists.net>
Sent: Tuesday, October 30, 2007 10:41 PM
Subject: Re: [BC] to fluorescents


> I would disagree with that 300V conclusion Peter.  Most 277 installations
> carry more than one phase in a conduit and come from a 600V class load
> center or panel. Therefore the all equipment and cabling used on that
> circuit would be subject to the 600V requirement. I know here the second
> 277/480 enters the picture nothing below 600V class equipment is allowed
> until a derived service of 240 or 208/120 is realized down stream.  At
> which point, 240V rated equipment is permitted on for those downstream
> circuits.
>
> That and you can't mix 120/208 and 277/480 circuits in the same conduit
> since they do not share a common overload/control point.
>
> Been there done it many times....
>
> MM.
>
> At 07:06 PM 10/30/2007 -0700, PeterH5322 wrote
>
> > >> I'll bet it was 277/480 fluorescents and not 120/240.
> > >>
> > >please elaborate
> >
> >Many older installations had 120 for lighting, regardless of the service,
> >even if it required a customer-owned "dry type" transformer.
> >
> >Most new installations are 277/480 Y, and the fluorescent lighting is
> >277, which is still "300 volt class", as is 120 volts, so the same wiring
> >methods and materials may be employed, yet there is no need for a
> >customer-owned transformer.
> >
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