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3-Phase question...need answer???
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Jason Gant
Hi group,
Could someone here please tell me what I need to be seeing inside my meter box? I have 4 wires feeding into my meter box from the pole (3 "hots" and a neutral). One "hot" is a blue wire and resides on the right inside the meter can...I assume this is the third leg and will refer to it as leg "B". Each of the 3 legs measure 120 volts AC to neutral. There is 240V between "A" and "C", and 240V between "A" and "B"(the blue '3rd' leg). I only measure 2V between "C" and "B"(the blue "3rd' leg). Is this right? Perhaps this is Delta connected rather than a Wye connected? I'm not too knowledgable on 3 phase. Also, "C" and "B"(the blue '3rd'leg) are the 2 legs pulled right out of my meter can into the 240V breaker can for my air conditioning unit. I feel bad filling everyones' mailbox with "non-Felder" related stuff. If this is a no-no please let me know, no problem here? But for me, this electrical project is the last hurdle before I "sign on the dotted line"...for my new KF700pro!!! Can anyone tell me what I have, and the readings I should be seeing? thanks, Jason Gant |
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Scott Slater
Hi,
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Don't worry about sending this type of info out, this is what the group is for. I am not sure about your electrical question, I would suggest that you call up an electrician who knows about commercial applications. A home electrician may not be as knowledgeable as one that works on commercial installations. From what you are saying about the power, my assumption is that B and C are the same. From what I understand, 3 phase power is made up of 3 different hot wires on 3 different phases. This is the way that you can get constant voltage to the motor. This does not explain why the 2 legs are going to the AC at 240 v. When I check the power from my phase converter I get the following readings: A - B 240 v A - C 265 v (c is the manufactured phase and will be higher with no load) B - C 275 v When equipment is turned on, the loads are about the same (230 - 245 v). Good luck finding out, and when you do get an answer, please post it to the FOG. Scott Slater scott@... www.studiouw.com -----Original Message-----
From: Jason Gant [mailto:rjasong@...] Sent: Tuesday, April 25, 2000 7:20 PM To: felder-woodworking@... Subject: [felder-woodworking] 3-Phase question...need answer??? Hi group, Could someone here please tell me what I need to be seeing inside my meter box? I have 4 wires feeding into my meter box from the pole (3 "hots" and a neutral). One "hot" is a blue wire and resides on the right inside the meter can...I assume this is the third leg and will refer to it as leg "B". Each of the 3 legs measure 120 volts AC to neutral. There is 240V between "A" and "C", and 240V between "A" and "B"(the blue '3rd' leg). I only measure 2V between "C" and "B"(the blue "3rd' leg). Is this right? Perhaps this is Delta connected rather than a Wye connected? I'm not too knowledgable on 3 phase. Also, "C" and "B"(the blue '3rd'leg) are the 2 legs pulled right out of my meter can into the 240V breaker can for my air conditioning unit. I feel bad filling everyones' mailbox with "non-Felder" related stuff. If this is a no-no please let me know, no problem here? But for me, this electrical project is the last hurdle before I "sign on the dotted line"...for my new KF700pro!!! Can anyone tell me what I have, and the readings I should be seeing? thanks, Jason Gant To Post a message, send it to: felder-woodworking@... To Unsubscribe, send a blank message to: felder-woodworking-unsubscribe@... Visit the group web site: |
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Rick Strom
Jason:
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I have Electrical Engineers who have worked for me for many years, heard this same comment so don't take offense: "don't touch it if you don't know what it is." Be carefull, you only get one chance at making a mistake when you mess with electricity, specifically 3 phase. If you are lucky, it will knock you on your ___, if your not, your children will inherit your tool. God was an electrical engineer, your nervous system is controlled by electrical pulses, if you hit it with high voltage, 60 cycles, your body, nervous system, will follow suit. Your heart rate cannot stand 60 cycles per second, that is exactly what happens when one gets electrocuted. First and foremost be carefull. Sermon is over. What you described is not right, something does not add up. Where did you check the voltage, was it on the line side or the load side of the meter? What type of meter are you using? How many times did you check it? A to B, A to C, B to C, on a 3 phase system should be the same. It would make no difference whether it be a Y or Delta system. You mentioned that all three legs to ground gave you 120v, which would be accurate for typical 120/240v 3p, 4w system. However, B to C should read 240v. Check it again, make sure you did not change the ratio on your meter. Rick Strom Virginia Operation -----Original Message-----
From: Jason Gant [mailto:rjasong@...] Sent: Tuesday, April 25, 2000 10:20 PM To: felder-woodworking@... Subject: [felder-woodworking] 3-Phase question...need answer??? Hi group, Could someone here please tell me what I need to be seeing inside my meter box? I have 4 wires feeding into my meter box from the pole (3 "hots" and a neutral). One "hot" is a blue wire and resides on the right inside the meter can...I assume this is the third leg and will refer to it as leg "B". Each of the 3 legs measure 120 volts AC to neutral. There is 240V between "A" and "C", and 240V between "A" and "B"(the blue '3rd' leg). I only measure 2V between "C" and "B"(the blue "3rd' leg). Is this right? Perhaps this is Delta connected rather than a Wye connected? I'm not too knowledgable on 3 phase. Also, "C" and "B"(the blue '3rd'leg) are the 2 legs pulled right out of my meter can into the 240V breaker can for my air conditioning unit. I feel bad filling everyones' mailbox with "non-Felder" related stuff. If this is a no-no please let me know, no problem here? But for me, this electrical project is the last hurdle before I "sign on the dotted line"...for my new KF700pro!!! Can anyone tell me what I have, and the readings I should be seeing? thanks, Jason Gant To Post a message, send it to: felder-woodworking@... To Unsubscribe, send a blank message to: felder-woodworking-unsubscribe@... Visit the group web site: |
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Charlie Norton
Are you sure this is 3 phase? It sounds as though the "c" and "b" legs are
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identical, which would means that there this just single phase coming into the box. If you only measure 2V between "b" and "c", how does this power the AC unit? Make sure your meter is on AC voltage and not DC. The DC measurement between these legs will be very low..should actually be under 2V. Good luck. -----Original Message-----
From: Jason Gant <rjasong@...> To: felder-woodworking@... <felder-woodworking@...> Date: Tuesday, April 25, 2000 7:25 PM Subject: [felder-woodworking] 3-Phase question...need answer??? Hi group,meter can...I assume this is the third leg and will refer to it as leg "B".felder-woodworking-unsubscribe@...
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Wolfgang Geiger
Dear Jason,
First of all I also would recommend to hire a qualified technician to help you with your electrical questions. You may also call you power supply service company and find out which hook up you have (or check your electricity bill). From what you mention in your e-mail I also would say you only have 1 phasesupply. In a 3 phase net you 240V between all phases. (L1 - phase 1, L2 - phase 2, L3 - phase 3). We you measure between L1 - L2, L1 - L3 and L2- L3 you should always get a voltage range of 208 V - 240 V, depending on where you live. Between any phase and ground you should measure approx. 110 V. If you measure only 2 V between any of the connections you either are making a measuring mistake or you are measuring the same phase. Wolfgang ----- Original Message ----- From: Jason Gant <rjasong@...> To: <felder-woodworking@...> Sent: Tuesday, April 25, 2000 7:19 PM Subject: [felder-woodworking] 3-Phase question...need answer??? Hi group,a neutral). One "hot" is a blue wire and resides on the right inside themeter can...I assume this is the third leg and will refer to it as leg "B".felder-woodworking-unsubscribe@...
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