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'[EE] 280VAC in EXIT sign'
2006\06\02@174714 by Gus S Calabrese

face picon face
I was asked to repair some EXIT signs ( in Colorado, USA ) in an office.

I discovered the sign was being fed 280VAC.  This was stepped down
to 120VAC for the lights in the sign.  Is this a common practice ?

POD    Gus Calabrese

2006\06\02@175655 by Bob Axtell

face picon face
Gus S Calabrese wrote:
> I was asked to repair some EXIT signs ( in Colorado, USA ) in an office.
>
> I discovered the sign was being fed 280VAC.  This was stepped down
> to 120VAC for the lights in the sign.  Is this a common practice ?
>
> POD    Gus Calabrese
>  
Yes. Its cheaper power.

--Bob

2006\06\02@181959 by Spehro Pefhany

picon face
At 03:47 PM 6/2/2006 -0600, you wrote:
>I was asked to repair some EXIT signs ( in Colorado, USA ) in an office.
>
>I discovered the sign was being fed 280VAC.  This was stepped down
>to 120VAC for the lights in the sign.  Is this a common practice ?

No, but 208VAC is. (sqrt(3) * 120VAC)

>Best regards.

Spehro Pefhany --"it's the network..."            "The Journey is the reward"
spam_OUTspeffTakeThisOuTspaminterlog.com             Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog  Info for designers:  http://www.speff.com




2006\06\02@182700 by Dave Lag

picon face
Bob Axtell wrote:
> Gus S Calabrese wrote:
>
>>I was asked to repair some EXIT signs ( in Colorado, USA ) in an office.
>>
>>I discovered the sign was being fed 280VAC.  This was stepped down
>>to 120VAC for the lights in the sign.  Is this a common practice ?
>>
>>POD    Gus Calabrese
>>  
>
> Yes. Its cheaper power.
>
> --Bob

Cheaper wire anyways, once out of the residential realm don't be
surprised by anything, 600v wall heaters etc.
D

2006\06\02@184220 by Dwayne Reid

flavicon
face
At 03:47 PM 6/2/2006, Gus S Calabrese wrote:
>I was asked to repair some EXIT signs ( in Colorado, USA ) in an office.
>
>I discovered the sign was being fed 280VAC.  This was stepped down
>to 120VAC for the lights in the sign.  Is this a common practice ?

Yes, it is.

I think that you will find that all the room lighting is running at
277 Vac.  That's one leg of a 480 Vac distribution system.

There are good (almost compelling) reasons to do this . . . but I
won't get into that here.  Suffice to say that it is regarded as
common practice.

dwayne

--
Dwayne Reid   <.....dwaynerKILLspamspam@spam@planet.eon.net>
Trinity Electronics Systems Ltd    Edmonton, AB, CANADA
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2006\06\02@230201 by VULCAN20

picon face
When I worked building maint. in a large mall all the bulbs were rated
240 V fed with 120V.  They seemed to last for ever.

On a lot of other lighting, such as fluorescent, it was 277V.

Gus S Calabrese wrote:

>I was asked to repair some EXIT signs ( in Colorado, USA ) in an office.
>
>I discovered the sign was being fed 280VAC.  This was stepped down
>to 120VAC for the lights in the sign.  Is this a common practice ?
>
>POD    Gus Calabrese
>  
>

2006\06\07@123641 by Robert Ammerman

picon face
> At 03:47 PM 6/2/2006 -0600, you wrote:
>>I was asked to repair some EXIT signs ( in Colorado, USA ) in an office.
>>
>>I discovered the sign was being fed 280VAC.  This was stepped down
>>to 120VAC for the lights in the sign.  Is this a common practice ?
>
> No, but 208VAC is. (sqrt(3) * 120VAC)

What the above means is that 208VAC is the phase-to-phase voltage on a three
phase system with 120VAC phase-to-neutral.

This is commonly used for lighting in industrial/commercial settings.

IIRC, another common industrial practice is a three phase system with
nominal 480VAC from phase-to-phase and 277V from phase to neutral. This may
be what you are seeing.

Bob Ammerman
RAm Systems



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