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Home > Archive > Electrical Engineering > March 2006 > Determining 480 delta vs 480 wye
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Determining 480 delta vs 480 wye
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| We are buying a furnace that will be manufactured with 480 delta.
How do I determine if we have 480 delta or 480 wye in our panel? (other
than carefully)
Is it true that 480 delta can be run from either 480 delta or 480 wye,
and that 480 wye equipment can only be run from a 480 wye source (as
was listed in one post)?
CD
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| Dale Farmer 2006-03-13, 6:21 pm |
| CD wrote:
> We are buying a furnace that will be manufactured with 480 delta.
>
> How do I determine if we have 480 delta or 480 wye in our panel? (other
> than carefully)
>
> Is it true that 480 delta can be run from either 480 delta or 480 wye,
> and that 480 wye equipment can only be run from a 480 wye source (as
> was listed in one post)?
>
> CD
>
You talk to your plant maintainence folks, who will want to know
about this thing, and know the answer to your real question.
--Dale
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| I agree that they should know this answer, but we are a small shop with
limited capabilities. Since they did not know the answer, I seek
outside help.
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| Ben Miller 2006-03-13, 6:21 pm |
| "CD" <cduston@techassess.com> wrote in message
news:1142283736.838028.223820@u72g2000cwu.googlegroups.com...
> We are buying a furnace that will be manufactured with 480 delta.
>
> How do I determine if we have 480 delta or 480 wye in our panel? (other
> than carefully)
>
> Is it true that 480 delta can be run from either 480 delta or 480 wye,
> and that 480 wye equipment can only be run from a 480 wye source (as
> was listed in one post)?
>
> CD
>
Your facility should have a one-line diagram of the electrical system, which
shows the power configuration.
Any load that only requires three wires, whether connected wye or delta
internally, will run fine on either a delta or wye supply system. If the
load requires four wires then the supply would need to be a wye in order to
provide the neutral.
If the furnace is wired delta, then it only needs three wires and will work
fine on any 480 volt three-phase system. It doesn't matter how the supply
transformer is wired.
Ben Miller
--
Benjamin D. Miller, PE
B. MILLER ENGINEERING
www.bmillerengineering.com
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| Long Ranger 2006-03-14, 3:21 am |
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"Ben Miller" <benmiller@worldnet.att.net> wrote in message
news:UOidnc7JCNtSe4jZnZ2dnUVZ_tCdnZ2d@comcast.com...
> "CD" <cduston@techassess.com> wrote in message
> news:1142283736.838028.223820@u72g2000cwu.googlegroups.com...
>
> Your facility should have a one-line diagram of the electrical system,
> which shows the power configuration.
>
> Any load that only requires three wires, whether connected wye or delta
> internally, will run fine on either a delta or wye supply system. If the
> load requires four wires then the supply would need to be a wye in order
> to provide the neutral.
>
> If the furnace is wired delta, then it only needs three wires and will
> work fine on any 480 volt three-phase system. It doesn't matter how the
> supply transformer is wired.
>
>
> Ben Miller
Good answer, but what about 4 wire delta?
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| Ben Miller 2006-03-14, 4:21 pm |
| "Long Ranger" <worpylorpkins@mindspring.com> wrote in message
news:YjtRf.4488$Bj7.3661@newsread2.news.pas.earthlink.net...
-> Good answer, but what about 4 wire delta?
You are not likely to find that on the load side. A typical four-wire load
would be a wye with neutral. That would not work on a four wire center-tap
delta supply. At some point, you need to pay attention to wiring diagrams
and understand what kind of power system you have!
Ben Miller
-
Benjamin D. Miller, PE
B. MILLER ENGINEERING
www.bmillerengineering.com
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| BFoelsch 2006-03-14, 9:21 pm |
| On Tue, 14 Mar 2006 13:32:45 -0600, "Ben Miller"
<benmiller@worldnet.att.net> wrote:
>"Long Ranger" <worpylorpkins@mindspring.com> wrote in message
>news:YjtRf.4488$Bj7.3661@newsread2.news.pas.earthlink.net...
>
>-> Good answer, but what about 4 wire delta?
>
>You are not likely to find that on the load side. A typical four-wire load
>would be a wye with neutral. That would not work on a four wire center-tap
>delta supply. At some point, you need to pay attention to wiring diagrams
>and understand what kind of power system you have!
>
I don't recall ever having seen a piece of factory-built equipment
that needed a 480V 4 wire supply. Other than in premises wiring, where
there are rules that change above 300V, why would a machine tool, for
example, need 277V single phase?. I'm sure there is a reason, but I
don't know what it is.
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| Ben Miller 2006-03-14, 10:21 pm |
| "BFoelsch" <BFoelsch@comcast.net> wrote in message
news:d7pe121e64bqg2di5oiinammncu6ksge9g@4ax.com...
> I don't recall ever having seen a piece of factory-built equipment
> that needed a 480V 4 wire supply. Other than in premises wiring, where
> there are rules that change above 300V, why would a machine tool, for
> example, need 277V single phase?. I'm sure there is a reason, but I
> don't know what it is.
I agree. I have never seen one either on 480. I was just telling him that on
a general basis, if there was one it would need a four-wire system feeding
it.
Ben Miller
--
Benjamin D. Miller, PE
B. MILLER ENGINEERING
www.bmillerengineering.com
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| Don Kelly 2006-03-15, 12:21 am |
| "BFoelsch" <BFoelsch@comcast.net> wrote in message
news:d7pe121e64bqg2di5oiinammncu6ksge9g@4ax.com...
> On Tue, 14 Mar 2006 13:32:45 -0600, "Ben Miller"
> <benmiller@worldnet.att.net> wrote:
>
>
> I don't recall ever having seen a piece of factory-built equipment
> that needed a 480V 4 wire supply. Other than in premises wiring, where
> there are rules that change above 300V, why would a machine tool, for
> example, need 277V single phase?. I'm sure there is a reason, but I
> don't know what it is.
----------------------------
I believe that there are installations in some office buildings where the
fluorescent lighting is 277V. This may be more common in Canada than in the
US.
--
Don Kelly @shawcross.ca
remove the X to answer
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| BFoelsch 2006-03-15, 6:21 am |
|
"Don Kelly" <dhky@shaw.ca> wrote in message
news:RZLRf.144872$B94.111698@pd7tw3no...
> "BFoelsch" <BFoelsch@comcast.net> wrote in message
> news:d7pe121e64bqg2di5oiinammncu6ksge9g@4ax.com...
load[color=darkred]
center-tap[color=darkred]
diagrams[color=darkred]
> ----------------------------
> I believe that there are installations in some office buildings where the
> fluorescent lighting is 277V. This may be more common in Canada than in
the
> US.
Oh yes, absolutely, that is common in the US. However, those are really
single phase loads connected to a 3 phase 4 wire premises wiring system.
Certainly 277 volt single phase loads exist and require a wye supply system.
My point is that I have never seen a 480 volt 3 phase machine tool or other
factory-built piece of utilization equipment that requires a neutral
connection.
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