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Except for the fact that the NA standard is 120/240 volts (there are a
number of authorative references, feel free to Google them). So your
two 'phases' are almost dead on (probably measurement error) and the
240 is slightly low (measurement error, seems odd that it can be off
consdiering that it is supposed to be the sum of the two 120 legs.)
delivered at the service entrance,Was going to ask someone knowledgeable to post the percentage voltage
variation allowed in the USA (or wherever it is) for 'normal service'.
Average values of +5 to -10% of the nominal, in California, as
208 three phase isn't delta. It's wye.Assuming a nominal 240VAC supply, 245V is in no way "not correct" -- it's
only about a 2% overvoltage.
And since there is likely no load in shop when the install was taking
place, the 245 would be a higher than normal reading.
But I question the use of "3phase" and "245 volts" in the OP question.
Around here, 245 volts would be perfectly normal for a single phase
circuit, very high for a "standard" 208/3 phase delta.
Not much standardization at voltage over 600V, at all.It was determined that it
would be necessary to standardize all voltages (just not the low
voltages we are discussing here) to allow interconnection, and direct
substitution of equipment.
It seems that way to you. More study can reveal how thosePeterD <peter2@hipson.net> wrote:
It was determined that it
would be necessary to standardize all voltages (just not the low
voltages we are discussing here) to allow interconnection, and direct
substitution of equipment.
Not much standardization at voltage over 600V, at all.
13.8, 12.47, 12.00 KV are all fairly common MV distribution voltages
around here.
jk
So hire me and find out for yourself.On Mon, 06 Jul 2009 03:48:34 -0700, Gunner Asch
gunner@NOSPAMlightspeed.net> wrote:
Hummm perhaps you havent any idea that Im one of the cheapest
CNC service techs in So. Cal?
Bwuahahahahaha! I'll bet your skill set matches your price schedule.
Low and lame.
Hummm? Yeah, you'd probably be better at that.
I know exactly how they are related, (I some how doubt that you do13.8, 12.47, 12.00 KV are all fairly common MV distribution voltages
around here.
jk
It seems that way to you. More study can reveal how those
distribution voltages are related. You may bother or not.
Are we sure that the electrician was givenI have been asked to offer an opinion in a sensitive situation.
A machinist moved his shop across town and required some rewiring (3-phase
outlets, conduit, etc.) in order to locate some machines where he wanted
them.
He hires a guy who's not a pro (and later discovers is not insured) but has
done shop wiring before and had a good attitude and track record. The guy
does good work. No complaints about the quality of his work.
Owner throws the switch, all works fine.
The story continues 4 weeks later when the very expensive CNC fries its
controller PCB to the tune of $4000.
Turns out the voltage in the shop was upward of 245 and the taps in the CNC's
power supply were set for 220.
What is the legal and moral responsibility of each party?
What will not be helpful are replies about the character or intelligence of
either of the players or their actions.
Thanks.
--
John English
"Are we sure that the electrician was givenI have been asked to offer an opinion in a sensitive situation.
Your arrogance does not impress me. I have some understanding of"JosephKK"<quiettechblue@yahoo.com> wrote:
13.8, 12.47, 12.00 KV are all fairly common MV distribution voltages
around here.
jk
It seems that way to you. More study can reveal how those
distribution voltages are related. You may bother or not.
I know exactly how they are related, (I some how doubt that you do
given the phrasing in your post) and I know exactly who provides what,
and why, but that in NO way makes them 'standardized'.
"You may believe that or not", it matters nothing.
jk
Having knowledge is arrogance?I know exactly how they are related, (I some how doubt that you do
given the phrasing in your post) and I know exactly who provides what,
and why, but that in NO way makes them 'standardized'.
"You may believe that or not", it matters nothing.
jk
Your arrogance does not impress me.
SO ???? What does that have to do with standardization of MVI have some understanding of
transformers as well.
And i do not care if i impress you.
WHy should I care? Nor did I ask you to impress me, did I?
would I?Bring
electronics instead of insults.
And electronics being relevant not at all to MV distribution, why
I have been asked to offer an opinion in a sensitive situation.
A machinist moved his shop across town and required some rewiring (3-phase
outlets, conduit, etc.) in order to locate some machines where he wanted
them.
He hires a guy who's not a pro (and later discovers is not insured) but has
done shop wiring before and had a good attitude and track record. The guy
does good work. No complaints about the quality of his work.
Owner throws the switch, all works fine.
The story continues 4 weeks later when the very expensive CNC fries its
controller PCB to the tune of $4000.
Turns out the voltage in the shop was upward of 245 and the taps in the CNC's
power supply were set for 220.
What is the legal and moral responsibility of each party?
What will not be helpful are replies about the character or intelligence of
either of the players or their actions.
Thanks.
--
John English
On Jul 5, 2:40 am, John E. <incogn...@xbjcd.com> wrote:
I have been asked to offer an opinion in a sensitive situation.
A machinist moved his shop across town and required some rewiring (3-phase
outlets, conduit, etc.) in order to locate some machines where he wanted
them.
He hires a guy who's not a pro (and later discovers is not insured) but has
done shop wiring before and had a good attitude and track record. The guy
does good work. No complaints about the quality of his work.
Owner throws the switch, all works fine.
The story continues 4 weeks later when the very expensive CNC fries its
controller PCB to the tune of $4000.
Turns out the voltage in the shop was upward of 245 and the taps in the CNC's
power supply were set for 220.
What is the legal and moral responsibility of each party?
What will not be helpful are replies about the character or intelligence of
either of the players or their actions.
Thanks.
--
John English
TWO WORDS
LOS ALAMOS
I AM PROTEUS