Re: Liability & responsibility of electrician?

>>> 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
>

That must have cost several pretty pennies.

Heh! I just commented on that in a different response. It cost just over
$22,000. They had quoted me over $30,000 originally, before they realized
they had to update the line. The time interval between the original
inquiry and the one where I committed was several years. Glad I waited!
We were still living in Utah, so it made no difference. We've had the three
phase service for about nine years now. Very convenient. I've had such
service since 1967.

Harold

Posted by Harold and Susan Vordos on July 9, 2009, 4:17 am

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>>>
>>>>
>>>>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.

Sigh! I'm through wasting my time with you. Take it up with someone that
gives a damn.

Harold

Posted by Martin H. Eastburn on July 8, 2009, 10:16 pm

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I'm concerned that the system engineer (was one) didn't know what
they were doing - no internal protection - or was the customer
to cheap and didn't buy an option.

I hate that kind of option - to lower the price and risk failures.

Power lines have gone from 200 to 245 in my lifetime and will likely
continue to inch up.

Remember 100v and then 107 and 110 and 115 and 120 and 125 and 130...

Pushing more power with the same cables - requires higher voltages.

Martin

Harold and Susan Vordos 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?
>
> Harold
>
>

Posted by Archimedes' Lever on July 8, 2009, 10:58 pm

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On Wed, 08 Jul 2009 21:16:52 -0500, "Martin H. Eastburn"

>I'm concerned that the system engineer (was one) didn't know what
>they were doing - no internal protection - or was the customer
>to cheap and didn't buy an option.
>
>I hate that kind of option - to lower the price and risk failures.
>
>Power lines have gone from 200 to 245 in my lifetime and will likely
>continue to inch up.
>
>Remember 100v and then 107 and 110 and 115 and 120 and 125 and 130...
>
>Pushing more power with the same cables - requires higher voltages.
>
>Martin

We have never gone above 120 anywhere in the lower 48 that I remember.

Please refrain from top posting.

Posted by RoyJ on July 9, 2009, 12:20 am

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I ALWAYS top post. Keeps from having to read the drivel.

But as for line voltage, I monitor my voltage with an accurate digital
meter. floats around 123 to 125 except during hot summer afternoons when
it sags appreciably.

As for the sag, the guys in our weld shop on the 4 PM to midnight shift
in the summer were constantly adjusting the heat levels down as the
voltage rose over their shifts.

Archimedes' Lever wrote:

> On Wed, 08 Jul 2009 21:16:52 -0500, "Martin H. Eastburn"
>

>> I'm concerned that the system engineer (was one) didn't know what
>> they were doing - no internal protection - or was the customer
>> to cheap and didn't buy an option.
>>
>> I hate that kind of option - to lower the price and risk failures.
>>
>> Power lines have gone from 200 to 245 in my lifetime and will likely
>> continue to inch up.
>>
>> Remember 100v and then 107 and 110 and 115 and 120 and 125 and 130...
>>
>> Pushing more power with the same cables - requires higher voltages.
>>
>> Martin

>
> We have never gone above 120 anywhere in the lower 48 that I remember.
>
>
> Please refrain from top posting.

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