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#41
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440 volt three phase question
In article , John Grabowski wrote:
*As I recall on a delta connection one of the phases will have a higher reading to ground than the other two. On a Y connection the reading to ground will be the same. In NJ, Public Service Electric and Gas will not permit that high leg to be installed in the same panel as the neutral. The NEC allows it though. What you are describing sounds to me like a 240V "star" system with high leg, a variant of Y. Two of the phases are 240V center tap with the center tap connected to neutral. That provides four 120V legs. The third is 240V with one end rather than the center tap of that transformer's winding connected to neutral to provide the "high leg". It is possible to use the center tap of that to provide a fifth 120V leg. *It's been a while since I have worked on three phase, but I seem to recall on a three phase 240 volt delta system, the high (Orange) leg is around 180 volts to ground. I only remember one phase as being center tapped. Next time I meet with someone from the power company I will ask them to refresh my memory. *I was just looking in my PSE&G handbook and found a drawing for three phase services. They supply 3 phase 4 wire 120/240 volt delta, Is that someting newer to me, as in 2 legs 120V from neutral and one leg 208V from neutral? 3 phase 4 wire 120/208 volt wye, No 240V here. That one is good for loads 120V from any of the 3 phases to ground, as well as 208V delta loads. 3 phase 4 wire 277/480 volt wye services That one appears to me to be a little common. That one gets to power 460-480 volt industrial motor loads and loads downstream of of step-down transformers downstream of the industrial customer's electic meter for 120V needs. For one thing, I have noticed recent presence of fluorescent lamp ballasts rated for 277V or 120-277 V as well as recent avilability of 277V incandescent lamps from bulbs.com. and they also list 3 phase 4 wire 265/460 volt wye but in parentheses they have "Obsolete". My guess is that's 4x 115V while more-usual is 4x 120V, for phase-to-phase. I guess the 460 is being or has been phased out (No pun intended). For the delta service they want the orange leg on the right terminal in the meter and of course after that it must go on the center terminal as per the NEC. As I mentioned before PSE&G wants the neutral in a separate panel from the high leg, therefore two panels must be installed; one single phase with neutral and one three phase without neutral. I think JCP&L will accept the neutral and high leg together, but I would have to double check. -- - Don Klipstein (Jr) ) |
#42
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440 volt three phase question
On 5/29/2010 6:29 PM, Don Klipstein wrote:
In , John Grabowski wrote: *As I recall on a delta connection one of the phases will have a higher reading to ground than the other two. On a Y connection the reading to ground will be the same. In NJ, Public Service Electric and Gas will not permit that high leg to be installed in the same panel as the neutral. The NEC allows it though. What you are describing sounds to me like a 240V "star" system with high leg, a variant of Y. Two of the phases are 240V center tap with the center tap connected to neutral. That provides four 120V legs. The third is 240V with one end rather than the center tap of that transformer's winding connected to neutral to provide the "high leg". It is possible to use the center tap of that to provide a fifth 120V leg. The secondaries are connected in delta. One of the secondaries has a CT that is used as the neutral for 120 VAC loads. |
#43
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440 volt three phase question
On 5/30/2010 3:25 AM, harry wrote:
On May 29, 7:52�pm, wrote: On 5/29/2010 11:08 AM, harry wrote: On May 29, 12:32 pm, �wrote: On 5/29/2010 3:14 AM, harry wrote: On May 28, 10:55 pm, � wrote: On 5/28/2010 3:44 PM, harry wrote: On May 28, 6:31 pm, Tom � wrote: On May 27, 5:22 pm, "Stormin Mormon" � wrote: Oh, thank you. I didn't know. -- Christopher A. Young Learn more about Jesus www.lds.org . � wrote in message ... No, it's 220 more or less, to ground It is entirely possible that the 440 volts is from a delta configured transformer that is not ground referenced or is corner grounded. Point is that one shouldn't assume that the transformer that is supplying the current is Y configured. -- Tom Horne It's only possible to determine how a three phase transformer is connected visually. Ie by checking the connections. You can make a very reliable determination with just a meter and knowing how 3 phase AC works.- Hide quoted text - - Show quoted text - That is completely wrong. Really? So if we take the original question where the OP could have used their meter and as an example observed 480 VAC between each phase leg and 277 from each phase leg to neutral we couldn't declare with confidence that the source transformers were connected in "Y" ?- Hide quoted text - - Show quoted text - If you read my post, If there are just three line �connections brought out, no, you can't tell whether its "star" or "delta" connected. I did. You didn't describe that limitation but you could still be a long way from completely wrong with only a meter if you only had access to the phase legs. Since a "Y" connection neutral is always bonded to ground I could still get the same readings I described by placing one of the meter probes on ground.- Hide quoted text - - Show quoted text - But you still wouldn't know whether it was star or delta connected. Consider the readings you would get if it were one or the other. |
#44
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440 volt three phase question
The OP question is if one leg to ground provides 120 volts to run a
device like a vacuum cleaner, or pressure washer. -- Christopher A. Young Learn more about Jesus www.lds.org .. "harry" wrote in message ... - Show quoted text - That is completely wrong. Really? So if we take the original question where the OP could have used their meter and as an example observed 480 VAC between each phase leg and 277 from each phase leg to neutral we couldn't declare with confidence that the source transformers were connected in "Y" ?- Hide quoted text - - Show quoted text - If you read my post, If there are just three line connections brought out, no, you can't tell whether its "star" or "delta" connected. |
#45
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440 volt three phase question
The OP question is if one leg to ground provides 120 volts to run a
device like a vacuum cleaner, or pressure washer. -- Christopher A. Young Learn more about Jesus www.lds.org .. "George" wrote in message ... On 5/29/2010 11:08 AM, harry wrote: On May 29, 12:32�pm, wrote: On 5/29/2010 3:14 AM, harry wrote: If you read my post, If there are just three line connections brought out, no, you can't tell whether its "star" or "delta" connected. I did. You didn't describe that limitation but you could still be a long way from completely wrong with only a meter if you only had access to the phase legs. Since a "Y" connection neutral is always bonded to ground I could still get the same readings I described by placing one of the meter probes on ground. |
#46
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440 volt three phase question
The OP question is if one leg to ground provides 120 volts to run a
device like a vacuum cleaner, or pressure washer. Sounds like, no. -- Christopher A. Young Learn more about Jesus www.lds.org .. "Don Klipstein" wrote in message ... In article , George wrote: On 5/29/2010 11:08 AM, harry wrote: and 277 from each phase leg to neutral we couldn't declare with confidence that the source transformers were connected in "Y" ?- Hide quoted text - - Show quoted text - If you read my post, If there are just three line connections brought out, no, you can't tell whether its "star" or "delta" connected. I did. You didn't describe that limitation but you could still be a long way from completely wrong with only a meter if you only had access to the phase legs. Since a "Y" connection neutral is always bonded to ground I could still get the same readings I described by placing one of the meter probes on ground. It sounds easy enough for a 440V delta circuit to have all 3 legs measure 277 volts from ground. One way for that to happen is if there is significant and equal stray capacitance from each leg to ground. Another is if someone connects a "Y" load to the circuit, and connects the load's center point to ground. -- - Don Klipstein ) |
#47
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440 volt three phase question
In this particular instance, the maint people (mall management) didn't
know there was a roof ladder. How would they know the voltage of a device? -- Christopher A. Young Learn more about Jesus www.lds.org .. "Metspitzer" wrote in message ... I did. You didn't describe that limitation but you could still be a long way from completely wrong with only a meter if you only had access to the phase legs. Since a "Y" connection neutral is always bonded to ground I could still get the same readings I described by placing one of the meter probes on ground. If I was unsure of the voltage, what I would do is call maintenance and ask. |
#48
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440 volt three phase question
The OP question is if one leg to ground provides 120 volts to run a
device like a vacuum cleaner, or pressure washer. Hmm. Maybe need a transformer, then? -- Christopher A. Young Learn more about Jesus www.lds.org .. "George" wrote in message ... *As I recall on a delta connection one of the phases will have a higher reading to ground than the other two. On a Y connection the reading to ground will be the same. In NJ, Public Service Electric and Gas will not permit that high leg to be installed in the same panel as the neutral. The NEC allows it though. That is because of the way the power company arranges that type of service. One of the transformers used in the delta connection has a center tap. They did that it situations where most of the load would be 3 phase but the same service could still supply 120 general purpose loads without the need for an on premise transformer. |
#49
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440 volt three phase question
The OP question is if one leg to ground provides 120 volts to run a
device like a vacuum cleaner, or pressure washer. Will a volt meter tell me if a transformer would help? -- Christopher A. Young Learn more about Jesus www.lds.org .. "John Grabowski" wrote in message ... That is because of the way the power company arranges that type of service. One of the transformers used in the delta connection has a center tap. They did that it situations where most of the load would be 3 phase but the same service could still supply 120 general purpose loads without the need for an on premise transformer. *So a volt meter will tell you if the service is a delta or a Y. |
#50
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440 volt three phase question
The OP question is if one leg to ground provides 120 volts to run a
device like a vacuum cleaner, or pressure washer. I can usually get a 120 volt device to run from 220 VAC single phase. -- Christopher A. Young Learn more about Jesus www.lds.org .. "Don Klipstein" wrote in message ... In article , John Grabowski wrote: *As I recall on a delta connection one of the phases will have a higher reading to ground than the other two. On a Y connection the reading to ground will be the same. In NJ, Public Service Electric and Gas will not permit that high leg to be installed in the same panel as the neutral. The NEC allows it though. What you are describing sounds to me like a 240V "star" system with high leg, a variant of Y. Two of the phases are 240V center tap with the center tap connected to neutral. That provides four 120V legs. The third is 240V with one end rather than the center tap of that transformer's winding connected to neutral to provide the "high leg". It is possible to use the center tap of that to provide a fifth 120V leg. -- - Don Klipstein ) |
#51
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440 volt three phase question
The OP question is if one leg to ground provides 120 volts to run a
device like a vacuum cleaner, or pressure washer. Please ask the power co person if it's possible to run a 120 volt device. -- Christopher A. Young Learn more about Jesus www.lds.org .. "John Grabowski" wrote in message ... What you are describing sounds to me like a 240V "star" system with high leg, a variant of Y. Two of the phases are 240V center tap with the center tap connected to neutral. That provides four 120V legs. The third is 240V with one end rather than the center tap of that transformer's winding connected to neutral to provide the "high leg". It is possible to use the center tap of that to provide a fifth 120V leg. *It's been a while since I have worked on three phase, but I seem to recall on a three phase 240 volt delta system, the high (Orange) leg is around 180 volts to ground. I only remember one phase as being center tapped. Next time I meet with someone from the power company I will ask them to refresh my memory. |
#52
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440 volt three phase question
The OP question is if one leg to ground provides 120 volts to run a
device like a vacuum cleaner, or pressure washer. Would that run a vacuum cleaner? -- Christopher A. Young Learn more about Jesus www.lds.org .. "John Grabowski" wrote in message ... *It's been a while since I have worked on three phase, but I seem to recall on a three phase 240 volt delta system, the high (Orange) leg is around 180 volts to ground. I only remember one phase as being center tapped. Next time I meet with someone from the power company I will ask them to refresh my memory. *I was just looking in my PSE&G handbook and found a drawing for three phase services. They supply 3 phase 4 wire 120/240 volt delta, 3 phase 4 wire 120/208 volt wye, 3 phase 4 wire 277/480 volt wye services and they also list 3 phase 4 wire 265/460 volt wye but in parentheses they have "Obsolete". I guess the 460 is being or has been phased out (No pun intended). For the delta service they want the orange leg on the right terminal in the meter and of course after that it must go on the center terminal as per the NEC. As I mentioned before PSE&G wants the neutral in a separate panel from the high leg, therefore two panels must be installed; one single phase with neutral and one three phase without neutral. I think JCP&L will accept the neutral and high leg together, but I would have to double check. |
#53
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440 volt three phase question
The OP question is if one leg to ground provides 120 volts to run a
device like a vacuum cleaner, or pressure washer. Long as it runs a vacuum cleaner. -- Christopher A. Young Learn more about Jesus www.lds.org .. "harry" wrote in message ... I did. You didn't describe that limitation but you could still be a long way from completely wrong with only a meter if you only had access to the phase legs. Since a "Y" connection neutral is always bonded to ground I could still get the same readings I described by placing one of the meter probes on ground.- Hide quoted text - - Show quoted text - But you still wouldn't know whether it was star or delta connected. |
#54
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440 volt three phase question
The OP question is if one leg to ground provides 120 volts to run a
device like a vacuum cleaner, or pressure washer. Would it run a vacuum cleaner? -- Christopher A. Young Learn more about Jesus www.lds.org .. "George" wrote in message ... On 5/30/2010 3:25 AM, harry wrote: I did. You didn't describe that limitation but you could still be a long way from completely wrong with only a meter if you only had access to the phase legs. Since a "Y" connection neutral is always bonded to ground I could still get the same readings I described by placing one of the meter probes on ground.- Hide quoted text - - Show quoted text - But you still wouldn't know whether it was star or delta connected. Consider the readings you would get if it were one or the other. |
#55
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440 volt three phase question
The OP question is if one leg to ground provides 120 volts to run a device like a vacuum cleaner, or pressure washer. *No Chris. At 440 volts one leg to ground would be way over 200 volts. As you said there should be a 120 volt service receptacle within 50'. That requirement has been in the mechanical code before it made it into the electrical code. - Show quoted text - That is completely wrong. Really? So if we take the original question where the OP could have used their meter and as an example observed 480 VAC between each phase leg and 277 from each phase leg to neutral we couldn't declare with confidence that the source transformers were connected in "Y" ?- Hide quoted text - - Show quoted text - If you read my post, If there are just three line connections brought out, no, you can't tell whether its "star" or "delta" connected. |
#56
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440 volt three phase question
On 5/30/2010 7:36 AM, Stormin Mormon wrote:
The OP question is if one leg to ground provides 120 volts to run a device like a vacuum cleaner, or pressure washer. Will a volt meter tell me if a transformer would help? Sure, any particular reason why you insist on top posting in a newsgroup where 99% of the posts are bottom posted? Just plain old politeness says you "go with the flow". If you were in a crowded hallway and everyone was walking to the right would you walk on the left just to prove something? |
#57
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440 volt three phase question
In article ,
George wrote: On 5/30/2010 7:36 AM, Stormin Mormon wrote: The OP question is if one leg to ground provides 120 volts to run a device like a vacuum cleaner, or pressure washer. Will a volt meter tell me if a transformer would help? Sure, any particular reason why you insist on top posting in a newsgroup where 99% of the posts are bottom posted? Just plain old politeness says you "go with the flow". If you were in a crowded hallway and everyone was walking to the right would you walk on the left just to prove something? An issue that Chris refuses to discuss, other than to trot out the ridiculous "I don't like to scroll" argument that top-posters favor, completely ignoring the fact that his own top-posting saves him no scrolling. FWIW, I did once ask him if it was Brigham Young who first advocated top posting, and he said no, it was Joseph Smith. |
#58
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440 volt three phase question
In article , George wrote:
On 5/29/2010 6:29 PM, Don Klipstein wrote: In , John Grabowski wrote: *As I recall on a delta connection one of the phases will have a higher reading to ground than the other two. On a Y connection the reading to ground will be the same. In NJ, Public Service Electric and Gas will not permit that high leg to be installed in the same panel as the neutral. The NEC allows it though. What you are describing sounds to me like a 240V "star" system with high leg, a variant of Y. Two of the phases are 240V center tap with the center tap connected to neutral. That provides four 120V legs. The third is 240V with one end rather than the center tap of that transformer's winding connected to neutral to provide the "high leg". It is possible to use the center tap of that to provide a fifth 120V leg. The secondaries are connected in delta. One of the secondaries has a CT that is used as the neutral for 120 VAC loads. In that arrangement with 240V secondaries, there would be two legs that are 120V from neutral and one that is 208V from neutral. The situation that I experienced had a high leg 240V from neutral. That made me think of another time when I once saw an outlet labelled 208V 3-phase (three lines 120V from ground in Y arrangement?). -- - Don Klipstein ) |
#59
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440 volt three phase question
Thanks. That helps me refrain from frying a vacuum cleaner.
-- Christopher A. Young Learn more about Jesus www.lds.org .. "John Grabowski" wrote in message ... The OP question is if one leg to ground provides 120 volts to run a device like a vacuum cleaner, or pressure washer. *No Chris. At 440 volts one leg to ground would be way over 200 volts. As you said there should be a 120 volt service receptacle within 50'. That requirement has been in the mechanical code before it made it into the electrical code. |
#60
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440 volt three phase question
Do you spend equal time, trying to reform people who leave a lot of
quoted text? -- Christopher A. Young See me on the web http://www.chrisyoungsshop.com/ .. .. "Smitty Two" wrote in message news An issue that Chris refuses to discuss, other than to trot out the ridiculous "I don't like to scroll" argument that top-posters favor, completely ignoring the fact that his own top-posting saves him no scrolling. FWIW, I did once ask him if it was Brigham Young who first advocated top posting, and he said no, it was Joseph Smith. |
#61
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440 volt three phase question
On May 30, 12:40�pm, "Stormin Mormon"
wrote: The OP question is if one leg to ground provides 120 volts to run a device like a vacuum cleaner, or pressure washer. Would it run a vacuum cleaner? -- Christopher A. Young Learn more about Jesus �www.lds.org . "George" wrote in message ... On 5/30/2010 3:25 AM, harry wrote: I did. You didn't describe that limitation but you could still be a long way from completely wrong with only a meter if you only had access to the phase legs. Since a "Y" connection neutral is always bonded to ground I could still get the same readings I described by placing one of the meter probes on ground.- Hide quoted text - - Show quoted text - But you still wouldn't know whether it was star or delta connected. Consider the readings you would get if it were one or the other. Look at the whole issue this way. Let's suppose you have an electric circuit inside a box with two terminals. You can measure the resistance of that circuit. For any given frequency of a current you pass through it, you can measure the impedance (XL or Xc). And that's it. There's absolutely nothing else you can tell. The same applies with a motor, transformer or whatever. If there are more terminals, you can only determine resistance and impedance between them.. Nothing whatever about the circuit inside the box. It's down to Kirchhoffs laws. Read all about it. http://en.wikipedia.org/wiki/Kirchhoff%27s_circuit_laws The bit about summation of currents at a node =0 is the bit you want. |
#62
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440 volt three phase question
So, yes, it would run a vacuum cleaner?
-- Christopher A. Young Learn more about Jesus www.lds.org .. "harry" wrote in message ... Look at the whole issue this way. Let's suppose you have an electric circuit inside a box with two terminals. You can measure the resistance of that circuit. For any given frequency of a current you pass through it, you can measure the impedance (XL or Xc). And that's it. There's absolutely nothing else you can tell. The same applies with a motor, transformer or whatever. If there are more terminals, you can only determine resistance and impedance between them.. Nothing whatever about the circuit inside the box. It's down to Kirchhoffs laws. Read all about it. http://en.wikipedia.org/wiki/Kirchhoff%27s_circuit_laws The bit about summation of currents at a node =0 is the bit you want. |
#63
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440 volt three phase question
On 5/30/2010 12:03 PM, Smitty Two wrote:
In , wrote: On 5/30/2010 7:36 AM, Stormin Mormon wrote: The OP question is if one leg to ground provides 120 volts to run a device like a vacuum cleaner, or pressure washer. Will a volt meter tell me if a transformer would help? Sure, any particular reason why you insist on top posting in a newsgroup where 99% of the posts are bottom posted? Just plain old politeness says you "go with the flow". If you were in a crowded hallway and everyone was walking to the right would you walk on the left just to prove something? An issue that Chris refuses to discuss, other than to trot out the ridiculous "I don't like to scroll" argument that top-posters favor, completely ignoring the fact that his own top-posting saves him no scrolling. FWIW, I did once ask him if it was Brigham Young who first advocated top posting, and he said no, it was Joseph Smith. And as I said it is a simple politeness thing. I participate in groups where the norm for the group is top posting and I go with it because it makes perfect sense for that situation. |
#64
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440 volt three phase question
On May 29, 3:41*pm, (Don Klipstein) wrote:
In article , George wrote: On 5/29/2010 11:08 AM, harry wrote: On May 29, 12:32 pm, *wrote: On 5/29/2010 3:14 AM, harry wrote: On May 28, 10:55 pm, * wrote: On 5/28/2010 3:44 PM, harry wrote: On May 28, 6:31 pm, Tom * wrote: On May 27, 5:22 pm, "Stormin Mormon" * wrote: Oh, thank you. I didn't know. -- Christopher A. Young Learn more about Jesus www.lds.org . * wrote in message ... No, it's 220 more or less, to ground It is entirely possible that the 440 volts is from a delta configured transformer that is not ground referenced or is corner grounded. Point is that one shouldn't assume that the transformer that is supplying the current is Y configured. -- Tom Horne It's only possible to determine how a three phase transformer is connected visually. Ie by checking the connections. You can make a very reliable determination with just a meter and knowing how 3 phase AC works.- Hide quoted text - - Show quoted text - That is completely wrong. Really? So if we take the original question where the OP could have used their meter and as an example observed 480 VAC between each phase leg and 277 from each phase leg to neutral we couldn't declare with confidence that the source transformers were connected in "Y" ?- Hide quoted text - - Show quoted text - If you read my post, If there are just three line *connections brought out, no, you can't tell whether its "star" or "delta" connected. I did. You didn't describe that limitation but you could still be a long way from completely wrong with only a meter if you only had access to the phase legs. Since a "Y" connection neutral is always bonded to ground I could still get the same readings I described by placing one of the meter probes on ground. * It sounds easy enough for a 440V delta circuit to have all 3 legs measure 277 volts from ground. *One way for that to happen is if there is significant and equal stray capacitance from each leg to ground. *Another is if someone connects a "Y" load to the circuit, and connects the load's center point to ground. -- *- Don Klipstein ) Don If the load had a "center point," i.e. if it is star configured, It would create a ground fault that would either trip the ground detector if present or just sit there until a fault occurred on another phase were upon the completely different voltage will probably damage that load. -- Tom Horne |
#65
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440 volt three phase question
In ,
Tom Horne wrote: On May 29, 3:41*pm, (Don Klipstein) wrote: In article , George wrote: way from completely wrong with only a meter if you only had access to the phase legs. Since a "Y" connection neutral is always bonded to ground I could still get the same readings I described by placing one of the meter probes on ground. * It sounds easy enough for a 440V delta circuit to have all 3 legs measure 277 volts from ground. *One way for that to happen is if there is significant and equal stray capacitance from each leg to ground. *Another is if someone connects a "Y" load to the circuit, and connects the load's center point to ground. *- Don Klipstein ) Don If the load had a "center point," i.e. if it is star configured, It would create a ground fault that would either trip the ground detector if present or just sit there until a fault occurred on another phase were upon the completely different voltage will probably damage that load. It surely appears to me that many old buildings lack ground fault interruptors. Thankfully, many, probably most buildings with 480V 3-phase are fed by "Y" / "star" connected transformer secondaries. In which case, proper neutrals are run (or at least are supposed to be). There is a common star load in many of these buildings, often loading the 3 phases unequally: 277V lighting circuits. -- - Don Klipstein ) |
#66
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440 volt three phase question
Bottom posting makes the reader scroll through old text to get at the
new. If a poster properly trims old text, the reader can scroll down if s/he wants the context. A person who leaves four levels of forwarding marks (like you did) is neglectful. Wasting others bandwidth. -- Christopher A. Young Learn more about Jesus www.lds.org .. "harry" wrote in message ... On May 31, 11:23�am, George wrote: On 5/30/2010 7:36 AM, Stormin Mormon wrote: The OP question is if one leg to ground provides 120 volts to run a device like a vacuum cleaner, or pressure washer. Bottom posting enables the thread to be read consecutively and always makes sense. |
#67
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440 volt three phase question
On Jun 1, 1:16�pm, "Stormin Mormon"
wrote: Bottom posting makes the reader scroll through old text to get at the new. If a poster properly trims old text, the reader can scroll down if s/he wants the context. A person who leaves four levels of forwarding marks (like you did) is neglectful. �Wasting others bandwidth. -- Christopher A. Young Learn more about Jesus �www.lds.org . "harry" wrote in message ... On May 31, 11:23 am, George wrote: On 5/30/2010 7:36 AM, Stormin Mormon wrote: The OP question is if one leg to ground provides 120 volts to run a device like a vacuum cleaner, or pressure washer. Bottom posting enables the thread to be read consecutively and always makes sense. Not if there is to-ing and fro-ing on the topic. The whole continuity is lost. |
#68
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440 volt three phase question
In article , Stormin Mormon wrote:
Bottom posting makes the reader scroll through old text to get at the new. If a poster properly trims old text, the reader can scroll down if s/he wants the context. A person who leaves four levels of forwarding marks (like you did) is neglectful. Wasting others bandwidth. I am posting "interleaved", second-place welcome to "bottom", while "top" is "*at least* highly frowned upon" in Usenet. Even when there is a fair rate of private e-mails being done in "top post manner". Those who do what is expectable according to the societal norms of Usenet quickly scroll past the lines of text beginning with quotation symbols, even at expense of scrolling past and missing earlier ones lacking quotation symbols. "harry" wrote in message ... On May 31, 11:23�am, George wrote: On 5/30/2010 7:36 AM, Stormin Mormon wrote: The OP question is if one leg to ground provides 120 volts to run a device like a vacuum cleaner, or pressure washer. Bottom posting enables the thread to be read consecutively and always makes sense. In the case of Usenet as opposed to some "private e-mail cultures", I say "amen to amen-at-least-squared"! -- - Don Klipstein ) |
#69
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OT 440 volt three phase question
Didn't Hitler try to make everyone live by his rules ? Stormey gives me
the impression he is always right. He should keep his preeeeeeeching for Saturday and not tell every one how to live their lives. Jerry http://community.webtv.net/awoodbutc...oodWorkingPage http://community.webtv.net/awoodbutcher/1974RuppCentair |
#70
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440 volt three phase question
On Thursday, May 27, 2010 at 10:03:40 AM UTC-5, Stormin Mormon wrote:
I've had the moment to work on 440 volt roof top heating and AC. Once in a while, need some power to run a 120 volt device. Is it 120 volts from one leg to ground? (Yeah, I could just check it. But I was on the roof yesterday, and not sure how long until I get to another roof.) -- Christopher A. Young Learn more about Jesus www.lds.org . I've got a client looking to buy 50 - 100 acres with access to 440 3 phase electricity. Question 1 - is this a heavy electric capacity? 2 - How does one figure this information out. There are power poles that traverse the frontage of the property. There are 4 wires total on the poles. One of the poles has 3 transformers on it. Any idea? |
#72
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440 volt three phase question
. I've got a client looking to buy 50 - 100 acres with access to 440 3 phase electricity. Question 1 - is this a heavy electric capacity? 2 - How does one figure this information out. There are power poles that traverse the frontage of the property. There are 4 wires total on the poles. One of the poles has 3 transformers on it. Any idea? The four wires on the pole are 3 phase power + neutral. If the 3 cans on the pole are indeed step-down transformers you will see that they supply a service to nearby customers. they could be regulating transformers or reclosers ? If you look for the nearest major customer supplied from the line - it might give you a starting point to ask the power company about that line's capability and connection costs. If your client is considering feeding back into the grid with his wind or solar generation - it would require some extra approvals and installation costs. John T. |
#73
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440 volt three phase question
On Monday, April 23, 2018 at 5:08:44 PM UTC-4, wrote:
On Mon, 23 Apr 2018 13:54:22 -0700 (PDT), wrote: On Thursday, May 27, 2010 at 10:03:40 AM UTC-5, Stormin Mormon wrote: I've had the moment to work on 440 volt roof top heating and AC. Once in a while, need some power to run a 120 volt device. Is it 120 volts from one leg to ground? (Yeah, I could just check it. But I was on the roof yesterday, and not sure how long until I get to another roof.) -- Christopher A. Young Learn more about Jesus www.lds.org . I've got a client looking to buy 50 - 100 acres with access to 440 3 phase electricity. Question 1 - is this a heavy electric capacity? 2 - How does one figure this information out. There are power poles that traverse the frontage of the property. There are 4 wires total on the poles. One of the poles has 3 transformers on it. Any idea? 480v will usually be wye distribution and that is 277v to ground. You will need a transformer to get 120/240 but they are readily available. That is generally considered a "heavy" service What's missing is what's the objective, eg do they need 3 phase or just 240/120 for a house. How the cost to you is determined is probably going to vary greatly depending on the policy of the local utility and their costs. A call to the power company having the distances, whether it;s to be overhead or underground, what kind of service you want, eg 300A 240/120 splitphase or 3 phase, etc should produce some numbers. |
#74
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440 volt three phase question
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#75
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440 volt three phase question
wrote in message ... On Thursday, May 27, 2010 at 10:03:40 AM UTC-5, Stormin Mormon wrote: I've had the moment to work on 440 volt roof top heating and AC. Once in a while, need some power to run a 120 volt device. Is it 120 volts from one leg to ground? (Yeah, I could just check it. But I was on the roof yesterday, and not sure how long until I get to another roof.) -- Christopher A. Young Learn more about Jesus www.lds.org . I've got a client looking to buy 50 - 100 acres with access to 440 3 phase electricity. Question 1 - is this a heavy electric capacity? 2 - How does one figure this information out. There are power poles that traverse the frontage of the property. There are 4 wires total on the poles. One of the poles has 3 transformers on it. Any idea? Very disturbing post as Stormin died on a roof 2 years ago and cannot reply. |
#76
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440 volt three phase question
In article , says...
wrote in message ... On Thursday, May 27, 2010 at 10:03:40 AM UTC-5, Stormin Mormon wrote: I've had the moment to work on 440 volt roof top heating and AC. Once in a while, need some power to run a 120 volt device. Is it 120 volts from one leg to ground? (Yeah, I could just check it. But I was on the roof yesterday, and not sure how long until I get to another roof.) -- Christopher A. Young Learn more about Jesus www.lds.org . I've got a client looking to buy 50 - 100 acres with access to 440 3 phase electricity. Question 1 - is this a heavy electric capacity? 2 - How does one figure this information out. There are power poles that traverse the frontage of the property. There are 4 wires total on the poles. One of the poles has 3 transformers on it. Any idea? Very disturbing post as Stormin died on a roof 2 years ago and cannot reply. Yea, I never look at the dates. See that was written over 7 years ago. |
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