[BC] to fluorescents

[Mike McCarthy]

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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