mbrooke
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And this is useful to the OP in what way?
Voltage trivia info IMO....non standard service.
Its another way to get 3 phase 240 if needed.
And this is useful to the OP in what way?
Voltage trivia info IMO....non standard service.
One other thought....kinda still on the subject. I'm old enough to have heard about 110/220, 115/230 and finally 120/240. Was it ever really 110/220? If so was it raised to allow for smaller wire to get the same watts? Just curious.....are we headed to 130/260? Or maybe 220 like Europe? Inquiring minds like mine want to know!:huh:
Its another way to get 3 phase 240 if needed.
You're still a child. I remember 110,112, 115, 117, and 118. (on appliances and equipment, not from services)I'm old enough to have heard about 110/220, 115/230 and finally 120/240.
Yes, back when a high leg was 190v.Was it ever really 110/220?
Yes, I know, but...
Non standard service. $$$
Non standard tranny. $$$
OP needs basic info, not esoteric designs that are not used everyday.
Depends on the POCO:
http://www.seattle.gov/light/engstd/docs2/U9-7.7.pdf
Page 157 or page 168 in the viewer tool box:
https://www.seattle.gov/light/engineerstd/docs/manuals/SES_2018_Online.pdf
Here under 3 phase common voltages:
https://www.mayerelectric.com/ASSETS/DOCUMENTS/CMS/EN/GEC9T10A1007.pdf
In the real world retired from service:
https://www.ebay.com/itm/ITC-Transf...240Y-138-Volt-3-Phase-34T85H4-C-/232571587937
https://www.caseyusa.com/products/s...v-pri-139-240y-v-sec-olsun-indoor-transformer
While less common than 120/208 and 277/480, they are indeed out there and being used without issue. There is nothing esoteric about practical solutions to various real world problems. As is the OP will need "delta" breakers for 3 phase and anything that lands on the high leg, so no extra cost in that regard.
Yes, more than a hundred years ago. Edison's first lighting systems (c.1880 or so) specified 100-volt light bulbs (a nice round number) and 110-volt generators, the difference being an allowance for voltage drop. A few years later, the 3-wire Edison circuit was implemented to reduce the amount of copper wire needed. The red wire was +100 volts DC to ground; the black wire was -100 volts DC.... Was it ever really 110/220? ...
Sigh.....I know this crap....useless to OP......OP s specing a simple service or feeder.
Seen many motors only marked 230 volts that run fine on 208 volt systems. Where you may have more troubles is when your 208 volt system is running at the low end of voltage tolerance, but if it is running at high end of tolerance you are still within the low tolerance range of the motor.It's been my experience that unless a motor has a nameplate rating of 208-230 (some do, but may require different wiring connections), a 230V motor will not work well (or at all) on 208. 230 on 240 is fine, 460 on 480 is fine.
Most of my motor experience has been with larger 3 phase, though.
"Delta breakers" are an item from the past. I'm guessing you meant a straight 240 volt breaker vs a 120/240 volt rated breaker. That said AFAIK all of today's common miniature three pole breakers are straight 240 volt rated and you only need to be concerned with that "slash vs straight" rating for two pole breakers at times.Depends on the POCO:
http://www.seattle.gov/light/engstd/docs2/U9-7.7.pdf
Page 157 or page 168 in the viewer tool box:
https://www.seattle.gov/light/engineerstd/docs/manuals/SES_2018_Online.pdf
Here under 3 phase common voltages:
https://www.mayerelectric.com/ASSETS/DOCUMENTS/CMS/EN/GEC9T10A1007.pdf
https://www.google.com/search?q=139...68DcAhXLqVQKHfmqBOg4ChCzGAhx&biw=1440&bih=725
In the real world retired from service:
https://www.ebay.com/itm/ITC-Transf...240Y-138-Volt-3-Phase-34T85H4-C-/232571587937
https://www.caseyusa.com/products/s...v-pri-139-240y-v-sec-olsun-indoor-transformer
While less common than 120/208 and 277/480, they are indeed out there and being used without issue. There is nothing esoteric about practical solutions to various real world problems. As is the OP will need "delta" breakers for 3 phase and anything that lands on the high leg, so no extra cost in that regard.
"Delta breakers" are an item from the past. I'm guessing you meant a straight 240 volt breaker vs a 120/240 volt rated breaker. That said AFAIK all of today's common miniature three pole breakers are straight 240 volt rated and you only need to be concerned with that "slash vs straight" rating for two pole breakers at times.
Aren't they straight rated - 120?Correct- straight rated- not those old 4 pole breakers that took two busses and looped through a high leg. Sadly I've gotten into the habit of calling straight rated breakers "delta breakers" because I think of them as typically being used on 120/240 3 phase delta. Also true about today's 3 poles being all straight rated. If only they would offer a straight rated single pole :angel:
Aren't they straight rated - 120?
I guess I was thinking how would you ever use them for 240, but I suppose a 120/240 rating would be possible considering use with a handle tie and at least one more breaker.
I have made use of it before, but never for a line to neutral connected circuit. May not have complied with the slash rating of a two pole breaker though:blink: but was not as educated on this topic at one time either.Straight rated 240Would make use of the high leg for lighting, water heaters, ect. I've known of cases where people wanted to make use of that empty every third space.
I have made use of it before, but never for a line to neutral connected circuit. May not have complied with the slash rating of a two pole breaker though:blink: but was not as educated on this topic at one time either.
They have their place. If you have primarily 120 volt loads that is not their place, unless you are in remote area and choose to go with open instead of full delta to have less distribution involved and still need three phase for certain loads.Personally I have a strong dislike for delta systems as you can see from this thread :lol:
They have their place. If you have primarily 120 volt loads that is not their place, unless you are in remote area and choose to go with open instead of full delta to have less distribution involved and still need three phase for certain loads.
If your load is mostly three phase motors - why not go with 240 instead of 208 volts?
And this is useful to the OP in what way?
Voltage trivia info IMO....non standard service.
Ha thanks for not clouding up the waters...
Everyone thanks for your responses. I appreciate the help and looks like it led to a decent conversation on distribution.
As for the "I've had to explain this far too many times..." comment, It's these kind of comments that make people not want to ask the questions. (I have a feeling it was probably multiple times to a few people) Perhaps if you were better at explaining you wouldn't have to do it so many times. I have a feeling you never asked that question and was born with that knowledge.
Thanks again everyone
Ha thanks for not clouding up the waters...
Everyone thanks for your responses. I appreciate the help and looks like it led to a decent conversation on distribution.
As for the "I've had to explain this far too many times..." comment, It's these kind of comments that make people not want to ask the questions. (I have a feeling it was probably multiple times to a few people) Perhaps if you were better at explaining you wouldn't have to do it so many times. I have a feeling you never asked that question and was born with that knowledge.
Thanks again everyone