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Posted by Harold and Susan Vordos on July 9, 2009, 4:23 am
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> On Wed, 08 Jul 2009 18:39:31 -0400, Jamie
>
>>Doug Miller wrote:
>>
>>>
>>>>
>>>>>
>>>>>
>>>>>>The voltage declared indicates that the service is, indeed, delta.
>>>>>
>>>>>Nonsense. 245VAC could *easily* be a [nominal] 240V single-phase
>>>>>service.
>>>>
>>>>Yes, it could be, but we're talking about industrial machinery,
>>>>generally
>>>>powered by three phase. I have serious doubts that a single phase CNC
>>>>would contain a $4,000 board when you can buy the machines for that
>>>>amount
>>>>of money.
>>>>
>>>>I'm convinced the wiring in question is three phase. The only
>>>>remaining
>>>>question is whether it's delta or wye. Considering wye reads 208 volts
>>>>leg
>>>>to leg, I'm pretty sure its delta. You?
>>>
>>>
>>> The point is that a measurement of 245V, in and of itself, is not proof
>>> of
>>> 3-phase delta service. I measure 243V between the two legs of my
>>> residential
>>> service, and I'm quite sure that it's only single-phase.
>>How ever, it is most likely originating from a 3 phase source via a
>>single phase xformer.
>
> What's that got to do with the price of oats in China?
Not a lot, but it may have a profound effect on the tariff on peanuts in
Brazil.
Harold
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Posted by Harold and Susan Vordos on July 9, 2009, 4:22 am
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> Doug Miller wrote:
>
>>
>>>
>>>>
>>>>
>>>>>The voltage declared indicates that the service is, indeed, delta.
>>>>
>>>>Nonsense. 245VAC could *easily* be a [nominal] 240V single-phase
>>>>service.
>>>
>>>Yes, it could be, but we're talking about industrial machinery,
>>>generally powered by three phase. I have serious doubts that a single
>>>phase CNC would contain a $4,000 board when you can buy the machines for
>>>that amount of money.
>>>
>>>I'm convinced the wiring in question is three phase. The only remaining
>>>question is whether it's delta or wye. Considering wye reads 208 volts
>>>leg to leg, I'm pretty sure its delta. You?
>>
>>
>> The point is that a measurement of 245V, in and of itself, is not proof
>> of 3-phase delta service. I measure 243V between the two legs of my
>> residential service, and I'm quite sure that it's only single-phase.
> How ever, it is most likely originating from a 3 phase source via a
> single phase xformer.
>
It is always from a three phase source. That's the way it comes from the
generators, although only one leg is generally used for distribution.
Where I live, one leg of the three phase ran the power for everyone on the
hill. When they needed to increase capacity, I paid for the third leg to be
installed while they were upgrading the service with the second leg. That's
how I ended up with three phase service in my shop, having had the primary
lines extended for over two miles.
Harold
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Posted by krw on July 9, 2009, 8:00 pm
Please log in for more thread options On Thu, 09 Jul 2009 08:22:24 GMT, "Harold and Susan Vordos"
>
>> Doug Miller wrote:
>>
>>>
>>>>
>>>>>
>>>>>
>>>>>>The voltage declared indicates that the service is, indeed, delta.
>>>>>
>>>>>Nonsense. 245VAC could *easily* be a [nominal] 240V single-phase
>>>>>service.
>>>>
>>>>Yes, it could be, but we're talking about industrial machinery,
>>>>generally powered by three phase. I have serious doubts that a single
>>>>phase CNC would contain a $4,000 board when you can buy the machines for
>>>>that amount of money.
>>>>
>>>>I'm convinced the wiring in question is three phase. The only remaining
>>>>question is whether it's delta or wye. Considering wye reads 208 volts
>>>>leg to leg, I'm pretty sure its delta. You?
>>>
>>>
>>> The point is that a measurement of 245V, in and of itself, is not proof
>>> of 3-phase delta service. I measure 243V between the two legs of my
>>> residential service, and I'm quite sure that it's only single-phase.
>> How ever, it is most likely originating from a 3 phase source via a
>> single phase xformer.
>>
>
>It is always from a three phase source. That's the way it comes from the
>generators, although only one leg is generally used for distribution.
All three legs are generally used for distribution.
>Where I live, one leg of the three phase ran the power for everyone on the
>hill. When they needed to increase capacity, I paid for the third leg to be
>installed while they were upgrading the service with the second leg. That's
>how I ended up with three phase service in my shop, having had the primary
>lines extended for over two miles.
That's unusual. All three phases are generally on each pole in
populated areas. Some rural areas do have only one phase distributed
down each road. It is uncommon to have all three phases run into a
home, though.
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Posted by Harold and Susan Vordos on July 10, 2009, 3:36 am
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> On Thu, 09 Jul 2009 08:22:24 GMT, "Harold and Susan Vordos"
>
>>
>>message
>>> Doug Miller wrote:
>>>
>>>>
>>>>>
>>>>>>and
>>>>>>
>>>>>>
>>>>>>>The voltage declared indicates that the service is, indeed, delta.
>>>>>>
>>>>>>Nonsense. 245VAC could *easily* be a [nominal] 240V single-phase
>>>>>>service.
>>>>>
>>>>>Yes, it could be, but we're talking about industrial machinery,
>>>>>generally powered by three phase. I have serious doubts that a single
>>>>>phase CNC would contain a $4,000 board when you can buy the machines
>>>>>for
>>>>>that amount of money.
>>>>>
>>>>>I'm convinced the wiring in question is three phase. The only
>>>>>remaining
>>>>>question is whether it's delta or wye. Considering wye reads 208 volts
>>>>>leg to leg, I'm pretty sure its delta. You?
>>>>
>>>>
>>>> The point is that a measurement of 245V, in and of itself, is not proof
>>>> of 3-phase delta service. I measure 243V between the two legs of my
>>>> residential service, and I'm quite sure that it's only single-phase.
>>> How ever, it is most likely originating from a 3 phase source via a
>>> single phase xformer.
>>>
>>
>>It is always from a three phase source. That's the way it comes from the
>>generators, although only one leg is generally used for distribution.
>
> All three legs are generally used for distribution.
>
>>Where I live, one leg of the three phase ran the power for everyone on the
>>hill. When they needed to increase capacity, I paid for the third leg to
>>be
>>installed while they were upgrading the service with the second leg.
>>That's
>>how I ended up with three phase service in my shop, having had the primary
>>lines extended for over two miles.
>
> That's unusual. All three phases are generally on each pole in
> populated areas. Some rural areas do have only one phase distributed
> down each road. It is uncommon to have all three phases run into a
> home, though.
Yeah, I should have been clear on how I said what I did. We live in a
remote area, with the smallest parcel being 5 acres. There are larger lots,
some of them as large as 60 acres. As a result, and the fact that it
hadn't developed much until the past ten years, only one leg ran on the
ridge. Growth necessitated the upgrade, but even then they had intended
to run only two of the legs. The three phase terminates at our residence,
and we are the only ones that are using all three legs.
I agree, having three phase run to a residence is not common, although I've
had it at the last three locations. First one was open delta. Second one
and this one are full blown three phase delta. Second one didn't cost us a
dime----all we had to do was guarantee a given amount of use over a given
amount of time. Wasn't so lucky here. It cost just over $22,000 to have
it run to us. Worth every damned penny as far as I'm concerned. I have a
50 kw induction furnace that I want to run, to say nothing of my numerous
three phase machine tools.
Harold
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Posted by on July 10, 2009, 11:44 pm
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>
>That's unusual. All three phases are generally on each pole in
>populated areas. Some rural areas do have only one phase distributed
>down each road. It is uncommon to have all three phases run into a
>home, though.
MANY street transformers are single phase only in residential areas.
The main feed would in all likelihood be 3 phase, with phases
separated to feed different streets/loops. Getting 3 phase power to a
building in areas like this is VERY expensive.
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