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#41
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Why are motors not current limited?
On Thu, 26 Apr 2018 05:09:28 +0100, Clare Snyder wrote:
On Wed, 25 Apr 2018 23:30:28 -0400, Ralph Mowery wrote: In article , says... I do have a couple of sockets wired so each outlet of the double outlet are connected to each side of a 240 volt line. The reason is it is next to a 240 volt socket that feeds that 120 volt one. I did that for my ham radio station so I can run an amplifier on 240 volts. I also have a 120 volt amplifier that draws lots of current so when using it, I have heaver wire. That is one place where your system of everything on a 240 volt line would have been handy. That (Edison circuit) isn't cricket. You can't guarantee the neutral current is within spec. I have 220V outlets wired with normal 12/2 (with white wire painted red) but a shared neutral between two 120V circuits on opposite legs of the 240V isn't legit. Dmned right it is. It's not only legal, it was REQUIRED BY CODE Why are you so obsessed with code? for kitchen countertop outlets in Canada for over 20 years. The last code revision is now requiring 20 amp countertop outlets instead of the "split" 15s. No reason I see that isn't just as sound as any other Edison circuit, as long as the breaker is sized for the conductors. If he has 12 gauge wiring, with a 20 amp double breaker, the neutral current will not exceed 20 amps. and if there is 20 amps on each side, there is NO neutral current. Unless you have inductive and capacitive loads.... -- President Bush was in South Dakota recently. There was an awkward moment at Mount Rushmore when President Bush said, "Hey, look, it's those guys on the money!" - Conan Obrien |
#42
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Why are motors not current limited?
On Sat, 28 Apr 2018 17:47:11 +0100, "Jimmy Wilkinson Knife"
wrote: On Thu, 26 Apr 2018 05:09:28 +0100, Clare Snyder wrote: On Wed, 25 Apr 2018 23:30:28 -0400, Ralph Mowery wrote: In article , says... I do have a couple of sockets wired so each outlet of the double outlet are connected to each side of a 240 volt line. The reason is it is next to a 240 volt socket that feeds that 120 volt one. I did that for my ham radio station so I can run an amplifier on 240 volts. I also have a 120 volt amplifier that draws lots of current so when using it, I have heaver wire. That is one place where your system of everything on a 240 volt line would have been handy. That (Edison circuit) isn't cricket. You can't guarantee the neutral current is within spec. I have 220V outlets wired with normal 12/2 (with white wire painted red) but a shared neutral between two 120V circuits on opposite legs of the 240V isn't legit. Dmned right it is. It's not only legal, it was REQUIRED BY CODE Why are you so obsessed with code? for kitchen countertop outlets in Canada for over 20 years. The last code revision is now requiring 20 amp countertop outlets instead of the "split" 15s. No reason I see that isn't just as sound as any other Edison circuit, as long as the breaker is sized for the conductors. If he has 12 gauge wiring, with a 20 amp double breaker, the neutral current will not exceed 20 amps. and if there is 20 amps on each side, there is NO neutral current. Unless you have inductive and capacitive loads.... Triplin harmonics really just affect 3 phase but maybe that is what you have there. |
#43
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Why are motors not current limited?
On Fri, 27 Apr 2018 17:14:47 +0100, wrote:
On Fri, 27 Apr 2018 13:56:59 +0100, "Jimmy Wilkinson Knife" wrote: That is really a Canadian thing. They like having two 120v circuits on one yoke in the kitchen. It is not that common in the US. Really handy to be able to run the toaster and the coffeemaker or kettle side by side without running cords across the contertop - and without tripping the breaker or blowing the fuse - - - But American kettles are only a few hundred watts :-) And most of them still use the ****ing stove to heat water. Most Americans would ask, what's a kettle? We don't drink that much tea and coffee comes from a coffee maker. Don't you cook anything in boiling water? Are you really a third world country? If they just want a cup of hot water they throw it in the microwave. Which takes ages to heat anything, the output is roughly only one kilowatt. -- Heard on a public transportation vehicle while in Orlando: "When you exit this vehicle, please be sure to lower your head and watch your step." "If you fail to do so, please lower your voice and watch your language." |
#44
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Troll-feeding Senile Yank Alert! LOL
On Sat, 28 Apr 2018 13:36:03 -0400, , the mentally
challenged, notorious, troll-feeding retard, blabbered again: Unless you have inductive and capacitive loads.... Triplin harmonics really just affect 3 phase but maybe that is what you have there. ALL the poor troll has is your senile gob around his cock, senile cocksucker! |
#45
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Why are motors not current limited?
On Fri, 27 Apr 2018 17:48:20 +0100, trader_4 wrote:
On Friday, April 27, 2018 at 12:16:25 PM UTC-4, Jimmy Wilkinson Knife wrote: The main distribution panel would have to be changed in EVERY house. Every breaker would need to be changed. Really? Does a breaker care what the voltage is? Even if they did, you can change a couple at a time. They do care, because a 120V breaker only contacts one hot. A 240V breaker contacts two hots and takes two slots in the panel So, you're going to run out of free breaker slots and need a new panel. All that expense to solve a problem that only you think exists. You must have some weird breakers. Ours make contact with live (er hot) and neutral (dunno what you call that) so they can tell if some as leaked to ground. Different weird. And one of your fundamental problems is that you can't understand anything that is different. Your breakers have to cope with two lives, ours don't. Why make things so complicated? Why don't you just have one breaker per side? 120V and neutral? Now if you only have the ****ty breakers without ground fault protection, you'd have two per dual-socket, as they're +120 and -120. So replace that with a dual line 240V breaker. Just how stupid and uneducable are you? It's been clearly explained to you several times here that while we have double receptacles all over the house, relatively few are wired as Edison circuits, shared neutral, which is what you're describing above My house for example has NONE wired that way. Not my fault you have such a dodgy wiring system. So much easier in the UK without two lives (er hots) to worry about. One line is zero volts, only one wire can give you a shock. We don't have to worry about isolating two lines. And that's how all the receptacles, all the lights in my house and most houses are wired, one hot, one neutral. The shared neutral arrangement is found here occasionally, it's a small percentage of all circuits. The light switches may or may not require changing (some are rated for 277 volts as used for lighting in some industrial/commercial 3 phase environments) Switches will work way above their voltage rating if you're not drawing maximum current. I've used a 12VDC switch rated at 10 amps to control a 240V light at 1 amp. Ain't that special? The village idiot that's bitching because he thinks we should have a fuse in every plug for safety, now says it's OK to use equipment beyond it's rating. It isn't beyond its rating. The current is one tenth of the rating. Beyond the VOLTAGE rating, idiot. And since the current is so low, that makes up for it. Learn about arcing. Virtually NO benefit. People who litter their posts with capitals and exclamation marks have OCD! Your power cords for light duty appliances and lamps are not going to be smaller than awg18 (about 5.5 or 6mm diameter jacket for 3 wire (grounded) cords) At half the current, they are half as thick. I dread to think what your Hoover wires are like. In industrial/commercial use where advantages exist, higher voltage is already used for "fixed assetts". Not to mention there are WAY MORE variations of 240 volt plugs used world wide than 120. And magically you'd inherit all those? How many different plug adaptors do you need to connect a device to the mains just within the EEC??? At LEAST 5. Actually I have a couple of adapters on the desk to my left. They will take any plug from USA, Australia, China, EU or the UK, and some others, I think the total was 8 completely different types. They just have some odd shaped holes which are a combination of all the different prong positions. Very handy as I can buy cheap stuff off Ebay from abroad and just plug it straight in. Word wide there are AT LEAST 20 incompatible versions of the 240 volt power plug rated at under 17 amps. EVERY 15 amp 120 volt outlet whether in North America, Japan, or wherever, is FULLY COMPATIBLE, and will even fit into a 20amp outlet!! The transmission losses will not change appreciably as the distribution voltage would not change. There is just NO CASE TO BE MADE for converting to 240 volts - particularly with the power consumption of virtually EVERYTHING going down instead of up. Please disable your capslock key. Instead of 100 watt lamps, we are now getting as much or more light from 17 watts. Solid state flat screen video displays and TVs are using 1/4 (or less) the power the older versions used. But there are more things in use that draw power. Think back to when you were a child and had a single lightbulb and a TV set in the room. The big loads: Ovens Range Stove Dryer Central AC Water heater They are all 240V and with the exception of the dryer and stove are direct wired on their own circuits. The dryer and stove have their own dedicated 30 0r 40A receptacle where they are located. And where they stay. Unlike the UK, where apparently you move those around to various other rooms in the house. Go figure. We don't need AC over here. Your opinion. But then you're a cheapskate. Obviously other people do have AC in the UK and I've stayed in places in the UK that had AC, thank God. No, virtually nobody has it, as it rarely gets over 20C outside. Oven and range is the same thing, Now they are not, at least not here. An oven is just that, an oven. I have double wall ovens and a separate cooktop. A range is a stove that combines an oven and cooktop. Almost all ours have both together. we have something we call a "cooker", which has 4 hobs on top and two ovens inside with a grill. That and the water heater are indeed stationary like yours. But everything else can be moved. Washing machines, dryers, dishwashers, all using 3kW. I don't have to rewire my house to shift a couple of kitchen appliances. I don't have to either. I can move my coffee grinder, kettle, microwave and plug it into other receptacles in my kitchen. I have no need to move my disposal or dishwasher. And if I did, it would be part of a kitchen renovation which is involved and moving a circuit is no big deal. And I don't have to rewire, I just move the appliance and plug it in somewhere else, because the UK has a clue how to make sockets available for anything. The disposal, Why do Americans have those? Why do you put food down your drain? Don't you have something called a bin? dishwasher are on their own circuits behind/under the counters. Good grief, this is beyond stupid. Even the fridge, if you moved it, you need a new receptacle, There are sockets everywhere, I plug it in whatever is closest, 5 minutes of manually shifting the appliance and plugging it into whatever socket is closest. we don't just put extension cords on them and plug them into a counter receptacle. Same thing with the washing machine and dryer, we don't need to bring them into our living rooms. Capiche? No, of course not. Who said living room? Stop making up **** to help your waning point. -- A hammer is a device designed to break valuable objects next to the nail you are aiming at. |
#46
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Why are motors not current limited?
On Sat, 28 Apr 2018 19:52:07 +0100, "Jimmy Wilkinson Knife"
wrote: On Fri, 27 Apr 2018 17:14:47 +0100, wrote: On Fri, 27 Apr 2018 13:56:59 +0100, "Jimmy Wilkinson Knife" wrote: That is really a Canadian thing. They like having two 120v circuits on one yoke in the kitchen. It is not that common in the US. Really handy to be able to run the toaster and the coffeemaker or kettle side by side without running cords across the contertop - and without tripping the breaker or blowing the fuse - - - But American kettles are only a few hundred watts :-) And most of them still use the ****ing stove to heat water. Most Americans would ask, what's a kettle? We don't drink that much tea and coffee comes from a coffee maker. Don't you cook anything in boiling water? Are you really a third world country? If they just want a cup of hot water they throw it in the microwave. Which takes ages to heat anything, the output is roughly only one kilowatt. a couple minutes is not ages. |
#47
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Troll-feeding Senile Yank Alert! LOL
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#48
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Why are motors not current limited?
On Saturday, April 28, 2018 at 12:47:17 PM UTC-4, Jimmy Wilkinson Knife wrote:
On Thu, 26 Apr 2018 05:09:28 +0100, Clare Snyder wrote: On Wed, 25 Apr 2018 23:30:28 -0400, Ralph Mowery wrote: In article , says... I do have a couple of sockets wired so each outlet of the double outlet are connected to each side of a 240 volt line. The reason is it is next to a 240 volt socket that feeds that 120 volt one. I did that for my ham radio station so I can run an amplifier on 240 volts. I also have a 120 volt amplifier that draws lots of current so when using it, I have heaver wire. That is one place where your system of everything on a 240 volt line would have been handy. That (Edison circuit) isn't cricket. You can't guarantee the neutral current is within spec. I have 220V outlets wired with normal 12/2 (with white wire painted red) but a shared neutral between two 120V circuits on opposite legs of the 240V isn't legit. Dmned right it is. It's not only legal, it was REQUIRED BY CODE Why are you so obsessed with code? He's not obsessed with code, he merely pointed out to you that you don;t know WTF you're talking about, *again*, and Edison circuits are normal, safe, and MEET CODE. The neutral current will never be greater than the breaker rating. For example, a 20A circuit will have 20A breakers and use 12g wire. There will never be more than 20A flowing in the neutral. |
#49
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Why are motors not current limited?
On Saturday, April 28, 2018 at 4:46:17 PM UTC-4, wrote:
On Sat, 28 Apr 2018 19:52:07 +0100, "Jimmy Wilkinson Knife" wrote: On Fri, 27 Apr 2018 17:14:47 +0100, wrote: On Fri, 27 Apr 2018 13:56:59 +0100, "Jimmy Wilkinson Knife" wrote: That is really a Canadian thing. They like having two 120v circuits on one yoke in the kitchen. It is not that common in the US. Really handy to be able to run the toaster and the coffeemaker or kettle side by side without running cords across the contertop - and without tripping the breaker or blowing the fuse - - - But American kettles are only a few hundred watts :-) And most of them still use the ****ing stove to heat water. Most Americans would ask, what's a kettle? We don't drink that much tea and coffee comes from a coffee maker. Don't you cook anything in boiling water? Are you really a third world country? If they just want a cup of hot water they throw it in the microwave. Which takes ages to heat anything, the output is roughly only one kilowatt. a couple minutes is not ages. Especially when most times you have other things you can be doing in the meantime. IK guess JWS can't multitask, he just sits there waiting for his kettle, can't do anything else, one small step at at time. He could fire up that 2200 watt 9" angle grinder he keeps harping about and cut up some steak or polish his nails while waiting. |
#50
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Why are motors not current limited?
On Sat, 28 Apr 2018 18:36:03 +0100, wrote:
On Sat, 28 Apr 2018 17:47:11 +0100, "Jimmy Wilkinson Knife" wrote: On Thu, 26 Apr 2018 05:09:28 +0100, Clare Snyder wrote: On Wed, 25 Apr 2018 23:30:28 -0400, Ralph Mowery wrote: In article , says... I do have a couple of sockets wired so each outlet of the double outlet are connected to each side of a 240 volt line. The reason is it is next to a 240 volt socket that feeds that 120 volt one. I did that for my ham radio station so I can run an amplifier on 240 volts. I also have a 120 volt amplifier that draws lots of current so when using it, I have heaver wire. That is one place where your system of everything on a 240 volt line would have been handy. That (Edison circuit) isn't cricket. You can't guarantee the neutral current is within spec. I have 220V outlets wired with normal 12/2 (with white wire painted red) but a shared neutral between two 120V circuits on opposite legs of the 240V isn't legit. Dmned right it is. It's not only legal, it was REQUIRED BY CODE Why are you so obsessed with code? for kitchen countertop outlets in Canada for over 20 years. The last code revision is now requiring 20 amp countertop outlets instead of the "split" 15s. No reason I see that isn't just as sound as any other Edison circuit, as long as the breaker is sized for the conductors. If he has 12 gauge wiring, with a 20 amp double breaker, the neutral current will not exceed 20 amps. and if there is 20 amps on each side, there is NO neutral current. Unless you have inductive and capacitive loads.... Triplin harmonics really just affect 3 phase but maybe that is what you have there. I can't be bothered doing the calculations, but are you telling me that an inductive load in series with a resistive load will produce no neutral current in the middle? -- You are The One. But not The One. The One who is not The One, but is Another One. But you are that One who is The One who is The Other One who is, in fact, The One. All is lost. |
#51
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Why are motors not current limited?
On Sat, 28 Apr 2018 17:47:11 +0100, "Jimmy Wilkinson Knife"
wrote: On Thu, 26 Apr 2018 05:09:28 +0100, Clare Snyder wrote: On Wed, 25 Apr 2018 23:30:28 -0400, Ralph Mowery wrote: In article , says... I do have a couple of sockets wired so each outlet of the double outlet are connected to each side of a 240 volt line. The reason is it is next to a 240 volt socket that feeds that 120 volt one. I did that for my ham radio station so I can run an amplifier on 240 volts. I also have a 120 volt amplifier that draws lots of current so when using it, I have heaver wire. That is one place where your system of everything on a 240 volt line would have been handy. That (Edison circuit) isn't cricket. You can't guarantee the neutral current is within spec. I have 220V outlets wired with normal 12/2 (with white wire painted red) but a shared neutral between two 120V circuits on opposite legs of the 240V isn't legit. Dmned right it is. It's not only legal, it was REQUIRED BY CODE Why are you so obsessed with code? for kitchen countertop outlets in Canada for over 20 years. The last code revision is now requiring 20 amp countertop outlets instead of the "split" 15s. No reason I see that isn't just as sound as any other Edison circuit, as long as the breaker is sized for the conductors. If he has 12 gauge wiring, with a 20 amp double breaker, the neutral current will not exceed 20 amps. and if there is 20 amps on each side, there is NO neutral current. Unless you have inductive and capacitive loads.... Or, worse, harmonics. |
#53
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Why are motors not current limited?
On 4/28/2018 8:33 PM, trader_4 wrote:
He's not obsessed with code, he merely pointed out to you that you don;t know WTF you're talking about,*again*, and Edison circuits are normal, safe, and MEET CODE. The neutral current will never be greater than the breaker rating. For example, a 20A circuit will have 20A breakers and use 12g wire. There will never be more than 20A flowing in the neutral. Yes, Edison circuits MEET CODE but because of the potential mayhem lurking with an unbalanced load and a loose neutral, you won't find one in my house. Too much risk, not enough reward. |
#54
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Why are motors not current limited?
On Sat, 28 Apr 2018 22:09:00 -0400, Jack wrote:
On 4/28/2018 8:33 PM, trader_4 wrote: He's not obsessed with code, he merely pointed out to you that you don;t know WTF you're talking about,*again*, and Edison circuits are normal, safe, and MEET CODE. The neutral current will never be greater than the breaker rating. For example, a 20A circuit will have 20A breakers and use 12g wire. There will never be more than 20A flowing in the neutral. Yes, Edison circuits MEET CODE but because of the potential mayhem lurking with an unbalanced load and a loose neutral, you won't find one in my house. Too much risk, not enough reward. Then you better move to England or somewhere else that does not use a center tapped power supply, because your whole house is fed by a large edison circuit, and a single loose neutral throws the whole house system off-kilter. You are going after the wrong boogey-man |
#55
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Why are motors not current limited?
On Saturday, April 28, 2018 at 10:09:06 PM UTC-4, Jack wrote:
On 4/28/2018 8:33 PM, trader_4 wrote: He's not obsessed with code, he merely pointed out to you that you don;t know WTF you're talking about,*again*, and Edison circuits are normal, safe, and MEET CODE. The neutral current will never be greater than the breaker rating. For example, a 20A circuit will have 20A breakers and use 12g wire. There will never be more than 20A flowing in the neutral. Yes, Edison circuits MEET CODE but because of the potential mayhem lurking with an unbalanced load and a loose neutral, you won't find one in my house. Too much risk, not enough reward. Yes, that's a different question, whether they are worth it or not. I don't necessarily disagree with you. Another issue is that some homeowner who knows something about electricity, but like JWS doesn't understand how they work, screws around with it in the future. But the point here was that they do work, they don't somehow overload the neutral and that is recognized by them being described in the code and acceptable. |
#56
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Why are motors not current limited?
On Sun, 29 Apr 2018 02:01:15 +0100, "Jimmy Wilkinson Knife"
wrote: On Sat, 28 Apr 2018 18:36:03 +0100, wrote: On Sat, 28 Apr 2018 17:47:11 +0100, "Jimmy Wilkinson Knife" wrote: On Thu, 26 Apr 2018 05:09:28 +0100, Clare Snyder wrote: On Wed, 25 Apr 2018 23:30:28 -0400, Ralph Mowery wrote: In article , says... I do have a couple of sockets wired so each outlet of the double outlet are connected to each side of a 240 volt line. The reason is it is next to a 240 volt socket that feeds that 120 volt one. I did that for my ham radio station so I can run an amplifier on 240 volts. I also have a 120 volt amplifier that draws lots of current so when using it, I have heaver wire. That is one place where your system of everything on a 240 volt line would have been handy. That (Edison circuit) isn't cricket. You can't guarantee the neutral current is within spec. I have 220V outlets wired with normal 12/2 (with white wire painted red) but a shared neutral between two 120V circuits on opposite legs of the 240V isn't legit. Dmned right it is. It's not only legal, it was REQUIRED BY CODE Why are you so obsessed with code? for kitchen countertop outlets in Canada for over 20 years. The last code revision is now requiring 20 amp countertop outlets instead of the "split" 15s. No reason I see that isn't just as sound as any other Edison circuit, as long as the breaker is sized for the conductors. If he has 12 gauge wiring, with a 20 amp double breaker, the neutral current will not exceed 20 amps. and if there is 20 amps on each side, there is NO neutral current. Unless you have inductive and capacitive loads.... Triplin harmonics really just affect 3 phase but maybe that is what you have there. I can't be bothered doing the calculations, but are you telling me that an inductive load in series with a resistive load will produce no neutral current in the middle? You can bother yourself if you want but it is true. Triplin harmonics in 3 phase are a problem but we do not see it in single phase. Even in 3 phase it takes a fairly specific load to cause the problem. A building full of solid state fluorescent ballasts seem to be the worst if they are not PF corrected. Most commercial grade are these days, just for that reason. Commercial lighting should make you happy though since it is usually 277 volts. |
#57
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Why are motors not current limited?
On Sat, 28 Apr 2018 21:40:25 -0400, wrote:
On Sat, 28 Apr 2018 13:36:03 -0400, wrote: On Sat, 28 Apr 2018 17:47:11 +0100, "Jimmy Wilkinson Knife" wrote: On Thu, 26 Apr 2018 05:09:28 +0100, Clare Snyder wrote: On Wed, 25 Apr 2018 23:30:28 -0400, Ralph Mowery wrote: In article , says... I do have a couple of sockets wired so each outlet of the double outlet are connected to each side of a 240 volt line. The reason is it is next to a 240 volt socket that feeds that 120 volt one. I did that for my ham radio station so I can run an amplifier on 240 volts. I also have a 120 volt amplifier that draws lots of current so when using it, I have heaver wire. That is one place where your system of everything on a 240 volt line would have been handy. That (Edison circuit) isn't cricket. You can't guarantee the neutral current is within spec. I have 220V outlets wired with normal 12/2 (with white wire painted red) but a shared neutral between two 120V circuits on opposite legs of the 240V isn't legit. Dmned right it is. It's not only legal, it was REQUIRED BY CODE Why are you so obsessed with code? for kitchen countertop outlets in Canada for over 20 years. The last code revision is now requiring 20 amp countertop outlets instead of the "split" 15s. No reason I see that isn't just as sound as any other Edison circuit, as long as the breaker is sized for the conductors. If he has 12 gauge wiring, with a 20 amp double breaker, the neutral current will not exceed 20 amps. and if there is 20 amps on each side, there is NO neutral current. Unless you have inductive and capacitive loads.... Triplin harmonics really just affect 3 phase but maybe that is what you have there. Not true. Show me |
#58
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Why are motors not current limited?
On Sat, 28 Apr 2018 19:56:21 -0700 (PDT), trader_4
wrote: On Saturday, April 28, 2018 at 10:09:06 PM UTC-4, Jack wrote: On 4/28/2018 8:33 PM, trader_4 wrote: He's not obsessed with code, he merely pointed out to you that you don;t know WTF you're talking about,*again*, and Edison circuits are normal, safe, and MEET CODE. The neutral current will never be greater than the breaker rating. For example, a 20A circuit will have 20A breakers and use 12g wire. There will never be more than 20A flowing in the neutral. Yes, Edison circuits MEET CODE but because of the potential mayhem lurking with an unbalanced load and a loose neutral, you won't find one in my house. Too much risk, not enough reward. Yes, that's a different question, whether they are worth it or not. I don't necessarily disagree with you. Another issue is that some homeowner who knows something about electricity, but like JWS doesn't understand how they work, screws around with it in the future. But the point here was that they do work, they don't somehow overload the neutral and that is recognized by them being described in the code and acceptable. The main advantage is reduced voltage drop on a circuit that goes to the far end of the house. You might even find them that you don't know about because they were not required to be on a 2 pole or handle tied breaker until fairly recently. The requirement to have a common trip was applied to multiwire circuits in 1987 but only if both sides landed on the same yoke. (a split receptacle) There was no requirement before that. It was not until 2008 that the NEC required all multi wire circuits to have a common trip. When you understand that most jurisdictions take a while to adapt the new code. you can have a pretty new house with a multiwire circuit landing on 2 single pole breakers that are not even required to be grouped, much less handle tied. The typical multiwire circuit in a house will feed bedrooms or general lighting loads on the far end of the house and be split out in a ceiling box so they never land on a single yoke. . |
#59
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Troll-feeding Senile Yank Alert! LOL
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#60
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Troll-feeding Senile Yank Alert! LOL
On Sat, 28 Apr 2018 17:33:40 -0700 (PDT), tardo_4, the notorious,
troll-feeding Yankietard, driveled again: Why are you so obsessed with code? He's not obsessed with code, he merely pointed out to you that you don;t know WTF you're talking about, *again*, He doesn't care, tardo_4! ALL he cares about is whether you will take all his baits or not! Gee ...just HOW senile are you? LOL |
#61
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Troll-feeding Senile Yank Alert! LOL
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#62
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Why are motors not current limited?
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#63
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Why are motors not current limited?
On Sun, 29 Apr 2018 02:00:20 +0100, trader_4 wrote:
On Saturday, April 28, 2018 at 4:46:17 PM UTC-4, wrote: On Sat, 28 Apr 2018 19:52:07 +0100, "Jimmy Wilkinson Knife" wrote: On Fri, 27 Apr 2018 17:14:47 +0100, wrote: On Fri, 27 Apr 2018 13:56:59 +0100, "Jimmy Wilkinson Knife" wrote: That is really a Canadian thing. They like having two 120v circuits on one yoke in the kitchen. It is not that common in the US. Really handy to be able to run the toaster and the coffeemaker or kettle side by side without running cords across the contertop - and without tripping the breaker or blowing the fuse - - - But American kettles are only a few hundred watts :-) And most of them still use the ****ing stove to heat water. Most Americans would ask, what's a kettle? We don't drink that much tea and coffee comes from a coffee maker. Don't you cook anything in boiling water? Are you really a third world country? If they just want a cup of hot water they throw it in the microwave. Which takes ages to heat anything, the output is roughly only one kilowatt. a couple minutes is not ages. Especially when most times you have other things you can be doing in the meantime. IK guess JWS can't multitask, he just sits there waiting for his kettle, can't do anything else, one small step at at time. He could fire up that 2200 watt 9" angle grinder he keeps harping about and cut up some steak or polish his nails while waiting. I want to have a drink when I'm thirsty, not later on. That's why I never go to restaurants, why the **** does anyone want to wait half an hour to be fed? Why do you think McDonalds took off? -- Experience is what you got by not having it when you need it. |
#64
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Why are motors not current limited?
On Sun, 29 Apr 2018 04:24:42 +0100, wrote:
On Sun, 29 Apr 2018 02:01:15 +0100, "Jimmy Wilkinson Knife" wrote: On Sat, 28 Apr 2018 18:36:03 +0100, wrote: On Sat, 28 Apr 2018 17:47:11 +0100, "Jimmy Wilkinson Knife" wrote: On Thu, 26 Apr 2018 05:09:28 +0100, Clare Snyder wrote: On Wed, 25 Apr 2018 23:30:28 -0400, Ralph Mowery wrote: In article , says... I do have a couple of sockets wired so each outlet of the double outlet are connected to each side of a 240 volt line. The reason is it is next to a 240 volt socket that feeds that 120 volt one. I did that for my ham radio station so I can run an amplifier on 240 volts. I also have a 120 volt amplifier that draws lots of current so when using it, I have heaver wire. That is one place where your system of everything on a 240 volt line would have been handy. That (Edison circuit) isn't cricket. You can't guarantee the neutral current is within spec. I have 220V outlets wired with normal 12/2 (with white wire painted red) but a shared neutral between two 120V circuits on opposite legs of the 240V isn't legit. Dmned right it is. It's not only legal, it was REQUIRED BY CODE Why are you so obsessed with code? for kitchen countertop outlets in Canada for over 20 years. The last code revision is now requiring 20 amp countertop outlets instead of the "split" 15s. No reason I see that isn't just as sound as any other Edison circuit, as long as the breaker is sized for the conductors. If he has 12 gauge wiring, with a 20 amp double breaker, the neutral current will not exceed 20 amps. and if there is 20 amps on each side, there is NO neutral current. Unless you have inductive and capacitive loads.... Triplin harmonics really just affect 3 phase but maybe that is what you have there. I can't be bothered doing the calculations, but are you telling me that an inductive load in series with a resistive load will produce no neutral current in the middle? You can bother yourself if you want but it is true. Triplin harmonics in 3 phase are a problem but we do not see it in single phase. That can't be right. Just thinking about it simply - the current leads or lags the voltage with different types of load. So the centre point (neutral) has to have current going in different directions at different times. Even in 3 phase it takes a fairly specific load to cause the problem. A building full of solid state fluorescent ballasts seem to be the worst if they are not PF corrected. Most commercial grade are these days, just for that reason. Commercial lighting should make you happy though since it is usually 277 volts. Why 277?! -- Some people are alive only because it's illegal to kill them. |
#65
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Why are motors not current limited?
On Sun, 29 Apr 2018 08:43:33 -0400, Clare Snyder
wrote: Previous to 1974 in Canada. Had pullouts in my old fuse panel - house built in 1974. Helped my dad wire houses in the sixties and thry were all paired then too. That was for not only single yoke but any time the 2 circuits existed in the same box (lighting switch on one circuit and recepotacle on the other in a ganged box, as an example - or two lighting switches on different circuits) How do you "pair" fuses for general lighting circuits. They are usually screw in plug fuses. That is why the code did not require it. |
#66
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Why are motors not current limited?
On Sun, 29 Apr 2018 15:13:59 +0100, "Jimmy Wilkinson Knife"
wrote: On Sun, 29 Apr 2018 04:24:42 +0100, wrote: On Sun, 29 Apr 2018 02:01:15 +0100, "Jimmy Wilkinson Knife" wrote: On Sat, 28 Apr 2018 18:36:03 +0100, wrote: On Sat, 28 Apr 2018 17:47:11 +0100, "Jimmy Wilkinson Knife" wrote: On Thu, 26 Apr 2018 05:09:28 +0100, Clare Snyder wrote: On Wed, 25 Apr 2018 23:30:28 -0400, Ralph Mowery wrote: In article , says... I do have a couple of sockets wired so each outlet of the double outlet are connected to each side of a 240 volt line. The reason is it is next to a 240 volt socket that feeds that 120 volt one. I did that for my ham radio station so I can run an amplifier on 240 volts. I also have a 120 volt amplifier that draws lots of current so when using it, I have heaver wire. That is one place where your system of everything on a 240 volt line would have been handy. That (Edison circuit) isn't cricket. You can't guarantee the neutral current is within spec. I have 220V outlets wired with normal 12/2 (with white wire painted red) but a shared neutral between two 120V circuits on opposite legs of the 240V isn't legit. Dmned right it is. It's not only legal, it was REQUIRED BY CODE Why are you so obsessed with code? for kitchen countertop outlets in Canada for over 20 years. The last code revision is now requiring 20 amp countertop outlets instead of the "split" 15s. No reason I see that isn't just as sound as any other Edison circuit, as long as the breaker is sized for the conductors. If he has 12 gauge wiring, with a 20 amp double breaker, the neutral current will not exceed 20 amps. and if there is 20 amps on each side, there is NO neutral current. Unless you have inductive and capacitive loads.... Triplin harmonics really just affect 3 phase but maybe that is what you have there. I can't be bothered doing the calculations, but are you telling me that an inductive load in series with a resistive load will produce no neutral current in the middle? You can bother yourself if you want but it is true. Triplin harmonics in 3 phase are a problem but we do not see it in single phase. That can't be right. Just thinking about it simply - the current leads or lags the voltage with different types of load. So the centre point (neutral) has to have current going in different directions at different times. I used to say that too but it does not seem to be an issue. Even in 3 phase it takes a fairly specific load to cause the problem. A building full of solid state fluorescent ballasts seem to be the worst if they are not PF corrected. Most commercial grade are these days, just for that reason. Commercial lighting should make you happy though since it is usually 277 volts. Why 277?! One phase of a 480wye. |
#67
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Troll-feeding Senile Yank Alert! LOL
On Sun, 29 Apr 2018 10:58:15 -0400, , the mentally
challenged, notorious, troll-feeding retard, blabbered again: Commercial lighting should make you happy though since it is usually 277 volts. Why 277?! One phase of a 480wye. NOTHING makes him happier than a mentally challenged cretin like you sucking him off! BG |
#68
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Why are motors not current limited?
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#69
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Why are motors not current limited?
On Sunday, April 29, 2018 at 3:34:07 PM UTC-4, Clare Snyder wrote:
On Sun, 29 Apr 2018 10:54:41 -0400, wrote: On Sun, 29 Apr 2018 08:43:33 -0400, Clare Snyder wrote: Previous to 1974 in Canada. Had pullouts in my old fuse panel - house built in 1974. Helped my dad wire houses in the sixties and thry were all paired then too. That was for not only single yoke but any time the 2 circuits existed in the same box (lighting switch on one circuit and recepotacle on the other in a ganged box, as an example - or two lighting switches on different circuits) How do you "pair" fuses for general lighting circuits. They are usually screw in plug fuses. That is why the code did not require it. Fromwhat I remember, Canadian code required separation of the circuits UNLESS the fuses were "ganged". In MOST cases the circuits could be easily separated, not having 2 lseparate live feeds in a single box. In situations where that was not possible or feasible, the "ganged" fuses were required. In actual real-world situations, it was not common to run into the situation. My house had a "stove block" a "drier block" plus 4 ganged fuse pullouts - 2 for kitchen outlets, one for the AC and one for another "edison circuit" The fuse and drier blocks had cartridge fuses - the rest were plug fuses. Back in the 1969 code book - section 12-296 is states "conductors of different systems shall not be installed in the same box,, cabinet, or auxilliary gutter unless: 1 a barier of sheet steel not less than 0.0528 inch (16msg) or ane equivalent device of acceptable insulation material is used to devide the space into separate compartments for the conductors of each system - - - - - . Therer are exceptions listed I would take that to mean "different systems", eg low voltage signaling in the same box as 120V plus. Not different circuits of the same system. That is where they specify a divider if you're using the same box. An Edison circuit is actually the same branch circuit, at least I'd consider it to be one circuit. Also, in14-032 In branch circuits derived from a 3 wire grounded neutral systen (Edison circuit) 2 single pole manually operable circuit breakers may be used in lieu of a 2 pole b... |
#70
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Why are motors not current limited?
On Sun, 29 Apr 2018 15:34:02 -0400, Clare Snyder
wrote: On Sun, 29 Apr 2018 10:54:41 -0400, wrote: On Sun, 29 Apr 2018 08:43:33 -0400, Clare Snyder wrote: Previous to 1974 in Canada. Had pullouts in my old fuse panel - house built in 1974. Helped my dad wire houses in the sixties and thry were all paired then too. That was for not only single yoke but any time the 2 circuits existed in the same box (lighting switch on one circuit and recepotacle on the other in a ganged box, as an example - or two lighting switches on different circuits) How do you "pair" fuses for general lighting circuits. They are usually screw in plug fuses. That is why the code did not require it. Fromwhat I remember, Canadian code required separation of the circuits UNLESS the fuses were "ganged". In MOST cases the circuits could be easily separated, not having 2 lseparate live feeds in a single box. In situations where that was not possible or feasible, the "ganged" fuses were required. In actual real-world situations, it was not common to run into the situation. My house had a "stove block" a "drier block" plus 4 ganged fuse pullouts - 2 for kitchen outlets, one for the AC and one for another "edison circuit" The fuse and drier blocks had cartridge fuses - the rest were plug fuses. Back in the 1969 code book - section 12-296 is states "conductors of different systems shall not be installed in the same box,, cabinet, or auxilliary gutter unless: 1 a barier of sheet steel not less than 0.0528 inch (16msg) or ane equivalent device of acceptable insulation material is used to devide the space into separate compartments for the conductors of each system - - - - - . Therer are exceptions listed Also, in14-032 In branch circuits derived from a 3 wire grounded neutral systen (Edison circuit) 2 single pole manually operable circuit breakers may be used in lieu of a 2 pole breaker, providing that: 1) their handles are so interlocked that all ungrounded conductors will be opened by the manual operation of either handle; AND 2) each breaker has voltage ratings not less than that of the 3 wire grounded system So the linked breaker was required by (at least Canadian) code as early as 1969 for Edison circuits, and separate "systems" (read that as circuits) were not allowed in the same box.. I could look it up in 1966 code too if I could find my book. My '69 book was close at hand. "Different systems" does not apply, that refers to separately derived systems or services with different voltage characteristics. I am not quite sure how they could have specified "breakers" in 1969 since fuses were still pretty popular. The NEC had no such requirement. I agree if breakers were present, you might make that stick but multiwire circuits predate the first breakers by decades. |
#71
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Why are motors not current limited?
On Sun, 29 Apr 2018 20:20:44 -0400, wrote:
On Sun, 29 Apr 2018 15:34:02 -0400, Clare Snyder wrote: On Sun, 29 Apr 2018 10:54:41 -0400, wrote: On Sun, 29 Apr 2018 08:43:33 -0400, Clare Snyder wrote: Previous to 1974 in Canada. Had pullouts in my old fuse panel - house built in 1974. Helped my dad wire houses in the sixties and thry were all paired then too. That was for not only single yoke but any time the 2 circuits existed in the same box (lighting switch on one circuit and recepotacle on the other in a ganged box, as an example - or two lighting switches on different circuits) How do you "pair" fuses for general lighting circuits. They are usually screw in plug fuses. That is why the code did not require it. Fromwhat I remember, Canadian code required separation of the circuits UNLESS the fuses were "ganged". In MOST cases the circuits could be easily separated, not having 2 lseparate live feeds in a single box. In situations where that was not possible or feasible, the "ganged" fuses were required. In actual real-world situations, it was not common to run into the situation. My house had a "stove block" a "drier block" plus 4 ganged fuse pullouts - 2 for kitchen outlets, one for the AC and one for another "edison circuit" The fuse and drier blocks had cartridge fuses - the rest were plug fuses. Back in the 1969 code book - section 12-296 is states "conductors of different systems shall not be installed in the same box,, cabinet, or auxilliary gutter unless: 1 a barier of sheet steel not less than 0.0528 inch (16msg) or ane equivalent device of acceptable insulation material is used to devide the space into separate compartments for the conductors of each system - - - - - . Therer are exceptions listed Also, in14-032 In branch circuits derived from a 3 wire grounded neutral systen (Edison circuit) 2 single pole manually operable circuit breakers may be used in lieu of a 2 pole breaker, providing that: 1) their handles are so interlocked that all ungrounded conductors will be opened by the manual operation of either handle; AND 2) each breaker has voltage ratings not less than that of the 3 wire grounded system So the linked breaker was required by (at least Canadian) code as early as 1969 for Edison circuits, and separate "systems" (read that as circuits) were not allowed in the same box.. I could look it up in 1966 code too if I could find my book. My '69 book was close at hand. "Different systems" does not apply, that refers to separately derived systems or services with different voltage characteristics. I am not quite sure how they could have specified "breakers" in 1969 since fuses were still pretty popular. The NEC had no such requirement. I agree if breakers were present, you might make that stick but multiwire circuits predate the first breakers by decades. They also pre-date "standards" |
#72
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Why are motors not current limited?
On Sun, 29 Apr 2018 20:55:25 -0400, Clare Snyder
wrote: On Sun, 29 Apr 2018 20:20:44 -0400, wrote: On Sun, 29 Apr 2018 15:34:02 -0400, Clare Snyder wrote: On Sun, 29 Apr 2018 10:54:41 -0400, wrote: On Sun, 29 Apr 2018 08:43:33 -0400, Clare Snyder wrote: Previous to 1974 in Canada. Had pullouts in my old fuse panel - house built in 1974. Helped my dad wire houses in the sixties and thry were all paired then too. That was for not only single yoke but any time the 2 circuits existed in the same box (lighting switch on one circuit and recepotacle on the other in a ganged box, as an example - or two lighting switches on different circuits) How do you "pair" fuses for general lighting circuits. They are usually screw in plug fuses. That is why the code did not require it. Fromwhat I remember, Canadian code required separation of the circuits UNLESS the fuses were "ganged". In MOST cases the circuits could be easily separated, not having 2 lseparate live feeds in a single box. In situations where that was not possible or feasible, the "ganged" fuses were required. In actual real-world situations, it was not common to run into the situation. My house had a "stove block" a "drier block" plus 4 ganged fuse pullouts - 2 for kitchen outlets, one for the AC and one for another "edison circuit" The fuse and drier blocks had cartridge fuses - the rest were plug fuses. Back in the 1969 code book - section 12-296 is states "conductors of different systems shall not be installed in the same box,, cabinet, or auxilliary gutter unless: 1 a barier of sheet steel not less than 0.0528 inch (16msg) or ane equivalent device of acceptable insulation material is used to devide the space into separate compartments for the conductors of each system - - - - - . Therer are exceptions listed Also, in14-032 In branch circuits derived from a 3 wire grounded neutral systen (Edison circuit) 2 single pole manually operable circuit breakers may be used in lieu of a 2 pole breaker, providing that: 1) their handles are so interlocked that all ungrounded conductors will be opened by the manual operation of either handle; AND 2) each breaker has voltage ratings not less than that of the 3 wire grounded system So the linked breaker was required by (at least Canadian) code as early as 1969 for Edison circuits, and separate "systems" (read that as circuits) were not allowed in the same box.. I could look it up in 1966 code too if I could find my book. My '69 book was close at hand. "Different systems" does not apply, that refers to separately derived systems or services with different voltage characteristics. I am not quite sure how they could have specified "breakers" in 1969 since fuses were still pretty popular. The NEC had no such requirement. I agree if breakers were present, you might make that stick but multiwire circuits predate the first breakers by decades. They also pre-date "standards" The first version of the NEC came out in 1898 in New York City. |
#73
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Why are motors not current limited?
On Sun, 29 Apr 2018 21:28:40 -0400, wrote:
On Sun, 29 Apr 2018 20:55:25 -0400, Clare Snyder wrote: On Sun, 29 Apr 2018 20:20:44 -0400, wrote: On Sun, 29 Apr 2018 15:34:02 -0400, Clare Snyder wrote: On Sun, 29 Apr 2018 10:54:41 -0400, wrote: On Sun, 29 Apr 2018 08:43:33 -0400, Clare Snyder wrote: Previous to 1974 in Canada. Had pullouts in my old fuse panel - house built in 1974. Helped my dad wire houses in the sixties and thry were all paired then too. That was for not only single yoke but any time the 2 circuits existed in the same box (lighting switch on one circuit and recepotacle on the other in a ganged box, as an example - or two lighting switches on different circuits) How do you "pair" fuses for general lighting circuits. They are usually screw in plug fuses. That is why the code did not require it. Fromwhat I remember, Canadian code required separation of the circuits UNLESS the fuses were "ganged". In MOST cases the circuits could be easily separated, not having 2 lseparate live feeds in a single box. In situations where that was not possible or feasible, the "ganged" fuses were required. In actual real-world situations, it was not common to run into the situation. My house had a "stove block" a "drier block" plus 4 ganged fuse pullouts - 2 for kitchen outlets, one for the AC and one for another "edison circuit" The fuse and drier blocks had cartridge fuses - the rest were plug fuses. Back in the 1969 code book - section 12-296 is states "conductors of different systems shall not be installed in the same box,, cabinet, or auxilliary gutter unless: 1 a barier of sheet steel not less than 0.0528 inch (16msg) or ane equivalent device of acceptable insulation material is used to devide the space into separate compartments for the conductors of each system - - - - - . Therer are exceptions listed Also, in14-032 In branch circuits derived from a 3 wire grounded neutral systen (Edison circuit) 2 single pole manually operable circuit breakers may be used in lieu of a 2 pole breaker, providing that: 1) their handles are so interlocked that all ungrounded conductors will be opened by the manual operation of either handle; AND 2) each breaker has voltage ratings not less than that of the 3 wire grounded system So the linked breaker was required by (at least Canadian) code as early as 1969 for Edison circuits, and separate "systems" (read that as circuits) were not allowed in the same box.. I could look it up in 1966 code too if I could find my book. My '69 book was close at hand. "Different systems" does not apply, that refers to separately derived systems or services with different voltage characteristics. I am not quite sure how they could have specified "breakers" in 1969 since fuses were still pretty popular. The NEC had no such requirement. I agree if breakers were present, you might make that stick but multiwire circuits predate the first breakers by decades. They also pre-date "standards" The first version of the NEC came out in 1898 in New York City. And I own a copy of the "american electrician's handbook" by terrell Croft first printed in 1913 and reprinted in 2014 by McGraw-Hill Book Co in New Yoirk - passed down through the family |
#74
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Why are motors not current limited?
On Sun, 29 Apr 2018 15:58:15 +0100, wrote:
On Sun, 29 Apr 2018 15:13:59 +0100, "Jimmy Wilkinson Knife" wrote: On Sun, 29 Apr 2018 04:24:42 +0100, wrote: On Sun, 29 Apr 2018 02:01:15 +0100, "Jimmy Wilkinson Knife" wrote: On Sat, 28 Apr 2018 18:36:03 +0100, wrote: On Sat, 28 Apr 2018 17:47:11 +0100, "Jimmy Wilkinson Knife" wrote: On Thu, 26 Apr 2018 05:09:28 +0100, Clare Snyder wrote: On Wed, 25 Apr 2018 23:30:28 -0400, Ralph Mowery wrote: In article , says... I do have a couple of sockets wired so each outlet of the double outlet are connected to each side of a 240 volt line. The reason is it is next to a 240 volt socket that feeds that 120 volt one. I did that for my ham radio station so I can run an amplifier on 240 volts. I also have a 120 volt amplifier that draws lots of current so when using it, I have heaver wire. That is one place where your system of everything on a 240 volt line would have been handy. That (Edison circuit) isn't cricket. You can't guarantee the neutral current is within spec. I have 220V outlets wired with normal 12/2 (with white wire painted red) but a shared neutral between two 120V circuits on opposite legs of the 240V isn't legit. Dmned right it is. It's not only legal, it was REQUIRED BY CODE Why are you so obsessed with code? for kitchen countertop outlets in Canada for over 20 years. The last code revision is now requiring 20 amp countertop outlets instead of the "split" 15s. No reason I see that isn't just as sound as any other Edison circuit, as long as the breaker is sized for the conductors. If he has 12 gauge wiring, with a 20 amp double breaker, the neutral current will not exceed 20 amps. and if there is 20 amps on each side, there is NO neutral current. Unless you have inductive and capacitive loads.... Triplin harmonics really just affect 3 phase but maybe that is what you have there. I can't be bothered doing the calculations, but are you telling me that an inductive load in series with a resistive load will produce no neutral current in the middle? You can bother yourself if you want but it is true. Triplin harmonics in 3 phase are a problem but we do not see it in single phase. That can't be right. Just thinking about it simply - the current leads or lags the voltage with different types of load. So the centre point (neutral) has to have current going in different directions at different times. I used to say that too but it does not seem to be an issue. No it isn't. It won't exceed 20 amps. But it might not be zero. Even in 3 phase it takes a fairly specific load to cause the problem. A building full of solid state fluorescent ballasts seem to be the worst if they are not PF corrected. Most commercial grade are these days, just for that reason. Commercial lighting should make you happy though since it is usually 277 volts. Why 277?! One phase of a 480wye. Why do they use 480? -- Confucius say: "Man who lives in glass house should change in basement." |
#75
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Why are motors not current limited?
On Mon, 30 Apr 2018 14:28:40 +0100, "Jimmy Wilkinson Knife"
wrote: On Sun, 29 Apr 2018 15:58:15 +0100, wrote: On Sun, 29 Apr 2018 15:13:59 +0100, "Jimmy Wilkinson Knife" wrote: On Sun, 29 Apr 2018 04:24:42 +0100, wrote: On Sun, 29 Apr 2018 02:01:15 +0100, "Jimmy Wilkinson Knife" wrote: On Sat, 28 Apr 2018 18:36:03 +0100, wrote: On Sat, 28 Apr 2018 17:47:11 +0100, "Jimmy Wilkinson Knife" wrote: On Thu, 26 Apr 2018 05:09:28 +0100, Clare Snyder wrote: On Wed, 25 Apr 2018 23:30:28 -0400, Ralph Mowery wrote: In article , says... I do have a couple of sockets wired so each outlet of the double outlet are connected to each side of a 240 volt line. The reason is it is next to a 240 volt socket that feeds that 120 volt one. I did that for my ham radio station so I can run an amplifier on 240 volts. I also have a 120 volt amplifier that draws lots of current so when using it, I have heaver wire. That is one place where your system of everything on a 240 volt line would have been handy. That (Edison circuit) isn't cricket. You can't guarantee the neutral current is within spec. I have 220V outlets wired with normal 12/2 (with white wire painted red) but a shared neutral between two 120V circuits on opposite legs of the 240V isn't legit. Dmned right it is. It's not only legal, it was REQUIRED BY CODE Why are you so obsessed with code? for kitchen countertop outlets in Canada for over 20 years. The last code revision is now requiring 20 amp countertop outlets instead of the "split" 15s. No reason I see that isn't just as sound as any other Edison circuit, as long as the breaker is sized for the conductors. If he has 12 gauge wiring, with a 20 amp double breaker, the neutral current will not exceed 20 amps. and if there is 20 amps on each side, there is NO neutral current. Unless you have inductive and capacitive loads.... Triplin harmonics really just affect 3 phase but maybe that is what you have there. I can't be bothered doing the calculations, but are you telling me that an inductive load in series with a resistive load will produce no neutral current in the middle? You can bother yourself if you want but it is true. Triplin harmonics in 3 phase are a problem but we do not see it in single phase. That can't be right. Just thinking about it simply - the current leads or lags the voltage with different types of load. So the centre point (neutral) has to have current going in different directions at different times. I used to say that too but it does not seem to be an issue. No it isn't. It won't exceed 20 amps. But it might not be zero. Even in 3 phase it takes a fairly specific load to cause the problem. A building full of solid state fluorescent ballasts seem to be the worst if they are not PF corrected. Most commercial grade are these days, just for that reason. Commercial lighting should make you happy though since it is usually 277 volts. Why 277?! One phase of a 480wye. Why do they use 480? Same reason you are pimping for 220. It allows smaller conductors for a given amount of delivered power. 480 is common for services to large installations like office buildings and gets distributed to each floor as 480 where a transformer will take that down to 120/240 or 120/208. The house lighting will usually be 277 using one 480v phase to neutral. |
#76
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Why are motors not current limited?
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#77
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Troll-feeding Senile Yank Alert! LOL
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#78
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Why are motors not current limited?
On 04/30/2018 10:05 AM, Ralph Mowery wrote:
Most places that have equipment that uses lots of power in the US will have 480 volt 3 phase equipment such as motors. The lights are most often 277 volts single phase as that is the neutral to one hot leg of the 480 volt 3 phase circuit. We leased an old bakery where the freight elevator was 550. After 40 years of home repairs the 550 showed up in the damnedest places. I never made any assumptions about what I'd find when I opened a panel. |
#79
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Why are motors not current limited?
On Mon, 30 Apr 2018 12:35:03 -0600, rbowman
wrote: On 04/30/2018 10:05 AM, Ralph Mowery wrote: Most places that have equipment that uses lots of power in the US will have 480 volt 3 phase equipment such as motors. The lights are most often 277 volts single phase as that is the neutral to one hot leg of the 480 volt 3 phase circuit. We leased an old bakery where the freight elevator was 550. After 40 years of home repairs the 550 showed up in the damnedest places. I never made any assumptions about what I'd find when I opened a panel. The strangest panel for the uninitiated is 3 p corner grounded delta. It will look exactly like single phase 120/240 (2 pole breakers, 2 hots and a white grounded conductor) except there will be 240 to ground and you will have 240v 3 phase equipment hanging off of it. The first time I saw it I took a minute to figure out what I was looking at. The only place you will see it is where there are pretty much all 3 phase loads and maybe some 240v L/L load. |
#80
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Why are motors not current limited?
On Monday, April 30, 2018 at 11:05:39 AM UTC-5, Ralph Mowery wrote:
In article , says... Commercial lighting should make you happy though since it is usually 277 volts. Why 277?! One phase of a 480wye. Why do they use 480? Same reason you are pimping for 220. It allows smaller conductors for a given amount of delivered power. 480 is common for services to large installations like office buildings and gets distributed to each floor as 480 where a transformer will take that down to 120/240 or 120/208. The house lighting will usually be 277 using one 480v phase to neutral. Most places that have equipment that uses lots of power in the US will have 480 volt 3 phase equipment such as motors. The lights are most often 277 volts single phase as that is the neutral to one hot leg of the 480 volt 3 phase circuit. Really big users will have even higher voltages. The plant I worked for had a power room where the power from the electric company was converted from whatever they sent us to 13,200 volts. This was sent to other parts of the plant where it was mostly conveted to 480 V 3 P. There was some equipment that used around 4,000 volts. I did not usually work with that and don't recall the exect voltage, want to say 4100 volts. Then we got is some... It may have been 4160 which is one of the distribution high voltages I worked with in industrial and island power systems. ^_^ [8~{} Uncle Zapped Monster |
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