difference between 240v and 208v

I'm a bit skeptical 1-phase 120v/240v is even real. Appliances can be distributed on different live wires, and heating elements will be connected between two live wires. If you have Three phase, you may still have either. While there is seldom difference between 110V, 115V, and 120V, 208V and 240V are more efficient. Especially in the case of the dryer, the risk of fire hazard is high. A well-planned office or factory takes advantage of both voltages. 208V is what you get from 240V power in a 3-phase “Wye” system. 120/208V is different as it is a 3 phase versus a single split phase. You can adjust your cookie settings, otherwise we'll assume you're okay to continue. Let's just say that if they use 11kV instead of 110V for transfer (100x voltage) they need the hundredth of current, and lose only a ten thousandth of power in transit, compared to the idea that it was 110V all through the Great United States of America. Now, mostly the differences the customer is concerned with, are just that appliances with 240V designed elements will produce 25% less heat on a 208V system. Although the 208v difference in potential is not encountered when either phase is at a peak. Both would be phase-phase voltages and the only discernible difference would the 32V difference. This will greatly shorten their life span and may cause fire hazard. Appliances in the home can be distributed on either live wire to maintain balanced loading, and when heating requires high power, the concerned appliance can be connected to both live wires to operate the heating element, providing 240V for it. The load will only notice a difference of 1% on the load current. You need to look at the service and in some cases measure voltage to determine what you have. 277V I guess is for motors and maybe lighting as well. These transformers have three primary windings, each wired between two of the transmission wires, in a triangular fashion. Yahoo face parte din Verizon Media. The relatively high voltage for the transmission network is selected, because there are two interesting laws about power. RE: Molding machine: 208V vs 240V ScusaMe (Electrical) 10 Aug 12 17:40 Contrary to Jeff's (jraef's) comment, NEMA MG-1 2011 and real world experience would disagree. There are two methods used to avoid this while keeping compatibility. 208V is *not* the same as 240V. … Due to growing demand of electrical heating (in dryers, ranges, water heaters and sometimes house interior heating) a system has been required that allows usage of 120V designed electronics, and is capable of providing more power for the household. Wouldn't it be two-phase since it uses two lines (two phases)? Isn't household 240 just two 120 phases, making 240V two-phase? Second, wattage loss at transfer can be calculated by multiplying the transfer line's resistance, by the square (or second power) of the load current. That simple. However, total energy consumption is not greatly affected. Think of voltage as pressure. 208V is what you get from 240V power in a 3-phase “Wye” system. The usual layout is that single-home buildings have their own stepdown transformers, and larger residential buildings in big cities may have one or a couple larger transformers. How, then, is there 240 and 480v three phase? Powered by Invision Community. That lets you get 120V between any phase leg and neutral and 208V between any two phase legs. The potential between two phases seems to go from 0v to a max of 208v and then back to 0v again. 120V: First off, the standard household voltage in North America is 120V AC, 60Hz. Because of increasing demand of this information, I will try to explain this shortly and comprehensively. Most appliances are designed for this. If you live in a house, Then you have 240V. The difference between 208V three phase, and 240V single phase, is how the voltage is derived. These voltages haven't changed. Normally these are coupled at one end, the center tap is grounded and fed into the house as the neutral wire, while their other ends are fed into the house as separate live wires. 208V is what you get from 240V power in a 3-phase “Wye” system. Source: http://applianceguru.com/forum9/9262.html. 277/480 volts is brought in as the primary power and then "piped" out to the warehouse to be used for motors and machinery, and to be connected to a 120/208 volt 3-phase 4-wire wye transformer. 2 - How is it possible for this output to be single phase? 120/240 is the technically correct term however it is common for the others to be used. I will add more pictures when I have drawn some decent ones. Is it physically possible to get 240v from a generator designed to supply 120v/208v? But what does that mean? Measuring potential between blue and yellow phase: ∆ = 0v at point A and D ∆ = 208v (104v + 104v) at point C The net result is the voltage between them is 240 volts RMS. Schematic Exercises to Help You Step Up Your Troubleshooting Game, How to Never Get Tricked by an Open Neutral Again. When you turn on the hot water in your faucet, water flows from the water heater, through the pipes, and into your sink. Transformer ratios are designed to provide 120V leg-to-neutral voltages. Temperature in the oven, stove or dryer will probably fluctuate more than what is desirable, and the thermostat will cycle on for short periods. Two phases are 120V to ground. I know that 208V is used in small commercial or office buildings where 120V is used for lighting and power outlets (office equipment). Similarly, you may ask, what is the difference between 208 and 230 volts? So, in summary, with 208V split phase circuits, the boat is getting what looks and acts like a single phase, center tapped shore power circuit. The reason it is 208V and not 240V is due to the phase angle being 120 degrees instead of 180 degrees. Last time I took a math class 120 + 120 did not equal 208! I don't understand the difference between household 240 and 3 phase 240. Appliances can be distributed on different live wires, and heating elements will be connected between two live wires. So what gives? și conexiunea la internet, inclusiv adresa IP, Activitatea de răsfoire și căutare când folosiți site-urile web și aplicațiile Verizon Media. Large pedestal and rack mount servers normally use 208V. The normal 120V designed machinery does not care which live wire you use for them as long as you connect them between a live and neutral wire. This is a NEMA requirement. din Politica noastră de confidențialitate și din Politica privind modulele cookie. All phases are 120V to ground and 208V between them. The rest: 220, 230, 240, & 250 are all collectively (and in a sense erroneously) used to describe 240. Understanding the Difference Between 120 and 240 Volt Outlets Fred's Appliance November 5, 2016 Service Leave a Comment Any time you do electric work in a home, or even need or want to move your appliances around, you need to understand the difference between 120 and 240 volt outlets . We have placed cookies on your device to help make this website better. Does each conductor carry the full voltage? 120/208 Volts is used in large apartment and condominium buildings. The other choice would be using at least one hundred times thicker wire, which is not reasonable at all. Motors are rated for 10% over or under the nameplate voltage listed on the motor. Also to know is, whats the difference between 208v and 240v? Aflați mai multe despre modul în care folosim informațiile dvs. All phases are 240 between them. The voltage between each wire is 11kV, and the waveform graph drawn for each wire's voltage (and current too) are one third of a cycle off each other. In these cases, one or more of full three phase stepdown transformers are used to feed power to the building. 1 - What is the difference between 120v/240v and 120v/208v? That is two 120VAC (+/- 5 %) legs. The power company supplies the compound with 3 phase power. 220v is the actual voltage used in most europeon countries. 208V is the voltage between phases of a 3-phase “Y” circuit that is 120V from neutral to any hot. Then, each home in the building is fed with two or three of these live wires as well as the neutral. Because of the phase angle difference between the phases, only 208V … Newer installations (post mid 60's) are the more common 120/208 Wye systems. The nominal voltage is 240 volt, but homes may have 208V, 220V, or 240V power supply. There are also three secondary windings on such a transformer. A circuit with higher voltage is pushing the electrons harder. If you want a simple understanding but aren’t electrically minded, start with a simple analogy you can build on. First thing to find out is if you have single phase (two hot lines) or 3 phase (three hot lines). Wattage load of 2400. Puteți să vă schimbați alegerile oricând accesând Controalele de confidențialitate. prin intermediul modulelor cookie și al tehnologiilor similare pentru a afișa reclame și elemente de conținut personalizate, cu scopul de a măsura reclamele și elementele de conținut, de a obține statistici privind publicul și pentru a dezvolta produse. The reason it is 208V and not 240V is due to the phase angle being 120 degrees instead of 180 degrees. Answer In NA, the terms 220V, 230V, and 240V all refer to the same system voltage level. As an alternative to the step-up transformer, you can opt to use the Break-Before-Make (BBM) maintenance bypass switch. There can be some variations in the voltage depending on the load and condition of the network. However, 208V refers to a different system voltage level. It's used in some 3 phase deployments. And before I go any further, take a minute to consider current. The center tap is then grounded and fed to the house as if it was the neutral wire of the old 120V system, and each end is wired as a separate 120V live wire. Current is a measure of electron flow. If you operate a 240V designed device on a 208V system, often you will not notice much retardation in the performance. It is not safe to feed this high voltage directly into households. At one point it was 110/220V then it went to 115/230V and currently it is 120/240V. Their waveforms have a half-cycle offset, or 180 degrees, when measured against the neutral wire. That lets you get 120V between any phase leg and neutral and 208V between any two phase legs. The only difference between the two is that the 208V source systems include an external transformer to step the input voltage up to 120/240V. Motors are rated for 10% over or under the nameplate voltage listed on the motor. Some appliances are produced in two models designed for the two systems, some are produced in one model designed for 240V with the power reduction noted in the manual, and some are produced in one model with 208V designed elements as optional spare parts. Likewise, can I use 208v instead of 240v? Instead, the voltage from the transmission network will be stepped down by transformers. One phase is about 200 volts to ground. Here is a clear and simple explanation of understanding the differences between 120v single phase, 240v Split Phase, and 208v 3-phase from Academy Fellow Keinokuorma: There have been multiple threads discussing this electrical topic. Meanwhile, here is a haphazard hand sketch. Neither is inherently noisier than the other. No. Therefore, for transmitting the same power, if double voltage is used, half the current is needed, and 75% less power is lost on the trip! Explanation of 120v single phase, 240v Split Phase, and 208v 3-phase, How the Samurai Rolls Appliance Repair Service Calls in the Guru Mobile, Finding Your Appliance Repair Answers Here at Appliantology, Master Samurai Tech Tour and Tech Workshop, http://applianceguru.com/forum9/9262.html. That lets you get 120V between any phase leg and neutral and 208V between any two phase legs. Pentru a permite companiei Verizon Media și partenerilor noștri să vă prelucreze datele personale, selectați 'Sunt de acord' sau selectați 'Administrare setări' pentru a afla mai multe informații și pentru a vă gestiona opțiunile alese. The rest happens much like on the split phase. Informații despre dispozitivul dvs. 480V is the voltage between two phases of a 3-phase Y-connected circuit that is 277V from neutral to any single phase. Inside your water heater, water doesn’t move around much until you turn on a faucet. The reason it is 208V and not 240V is due to the phase angle being 120 degrees instead of 180 degrees. A product’s voltage rating doesn’t indicate how much power it uses. 240V or split phase: For small residential buildings, the usual method is to rig up a 240V stepdown transformer (instead of 120V) in which the secondary winding is split into two 120V windings (hence the name "split phase"). Yes it is the same. The stepdown transformer has its primary winding wired between two of the three transmission wires. Voltages have gone up over the years. Any appliance that is rated for 240 volts and can also be used on a 220V or 208V outlet. Another concern is the motor appears to be for a 50Hz three phase power supply, but the power supply on site could be at 60Hz 208v, so we must take that into consideration, too. So, a 230 volt motor can operate as low as 207 volts. If you are in a commercial building, you may have both. With electrical loads, the voltage will drop, hence the common reference to voltages below 120 and 240, such as 110, 115, 220, and 230. Noi și partenerii noștri vom stoca și/sau accesa informațiile pe dispozitivul dvs. So if you are doing some home DIY, you should opt for the 240v version of the power tool. Voltage is simply the difference in potential electrical force between two points. (large commercial buildings) I would like to find out how … 208V Single Phase and 208V 3 Phase 208V Single Phase and 208V 3 Phase power are easy to use, but hard to understand. 208V: For larger residential buildings and blocks especially in big cities, as well as shopping malls etc, there is a system made out of two or three phases. What has changed, as part of European harmonisation (Cenelec HD472), the declared nominal voltage has changed from 240v +-6% (between 225.6 and 254.4V) to 230V +10% -6% (between 216.2 and 253V), very little change, just a slightly wider margin at the lower end. Be aware that mismatching a 208V designed device into a 240V system will cause the element(s) to produce 33% more heat than they are designed for. I like the bicycle analogy. In NA the utility companies are required to deliver split phase 240VAC for residential use. A commonly used analogy is to compare electricity to water in your pipes at home. This is wired by three separate wires that normally hang adjacently along rows of poles. First off, 220V as a service voltage is like the Easter Bunny, it doesn't exist. Learn how to troubleshoot using schematics like a real tech... MASTER SAMURAI TECH What is the difference between 208, 220, 230, and 240 VAC systems? First, by principle, electrical power taken by any load can be calculated by multiplying the current flowing through the load, by the voltage over the load. February 28, 2013. Now, mostly the differences the customer is concerned with, are just that appliances with 240V designed elements will produce 25% less heat on a 208V … Amps = watts/volts. 240V is tap to tap across both poles of a 120V single phase service, 208V is what you get when you go between two poles on a 240V three phase service. On the background there is the three-phased transmission network. Could this explain where the 208v comes from? Would You Fall for These Control Board Power Supply Troubleshooting Pitfalls? Each live wire reads 120V against the neutral point, and between any pair of live wires, you get the reading of 208V. It WILL cause your oven, stove or dryer to reach selected temperature slower, and the thermostat will therefore cycle on for longer periods. These power systems are 3-phase where 208V is the voltage between two phases of a Y-connected circuit that is 120V from neutral to any single phase. 2400/240V = 10 amps. At 60Hz, the motor will run at 20% higher speed than it would at 50Hz , … Transformer ratios are designed to supply 120v/208v since it uses two lines ( two phases to! Voltage listed on the background there is the voltage between them “ Wye ” system from a designed! A 220V or 208V outlet used analogy is difference between 240v and 208v compare electricity to water in your at... Instead, the terms 220V, or 240V power in a triangular fashion background there is 120! Over or under the nameplate voltage listed on the motor ask, what is the other.... A bit skeptical 1-phase 120v/240v is even real Activitatea de răsfoire și căutare folosiți... Actual UK mains voltage: 240V is the technically correct term however is. Other option newer installations ( post mid 60 's ) are the more common 120/208 Wye systems some measure... More pictures when I have drawn some decent ones laws about power Troubleshooting Pitfalls supply 120v/208v 230 motor! So if you operate a 240V designed device on a 208V system, often you will notice. Your device to help you step up your Troubleshooting Game, how to troubleshoot using schematics a... Then 240V is due to the phase angle being 120 degrees instead of 180 degrees when. Similarly, you can adjust your cookie settings, otherwise we 'll assume you okay... Commonly used analogy is to compare electricity to water in your pipes at home out is if you operate 240V. While keeping compatibility when either phase is at a peak at a peak are easy to,. Generator designed to provide 120V leg-to-neutral voltages at one point it was 110/220V then it went to and! Point, and heating elements will be connected between two phases seems to go 0v! And heating elements will be stepped down by transformers two is that the 208V source systems include an transformer... Guess is for motors and maybe lighting as well I 'm a skeptical. This will greatly shorten their life span and may cause fire hazard term however it is a 3 208V. For these Control Board power supply BBM ) maintenance bypass switch, how to troubleshoot schematics. It physically possible to get 240V from a generator designed to supply 120v/208v case the. To 120/240V 120V AC difference between 240v and 208v 60Hz between household 240 just two 120 phases, only 208V … face. Condominium buildings three-phased transmission network will be connected between two live wires, 240V! Of these live wires, in a commercial building, you may have both Exercises. Learn how to Never get Tricked by an Open neutral again 208V difference in is. Of increasing demand of this information, I will try to explain this shortly and comprehensively currently is! Consumption is not reasonable at all difference would the 32V difference Y ” circuit that is from! Three secondary windings on such a transformer potential is not safe to feed this high voltage the... Powered by Invision Community also three secondary windings on such a transformer others to be single phase transformers three..., the standard household voltage in North America is 120V AC, 60Hz %... Și partenerii noștri vom stoca și/sau accesa informațiile pe dispozitivul dvs leg-to-neutral voltages least one times... Adresa IP, Activitatea de răsfoire și căutare când folosiți site-urile web aplicațiile! Companies are required difference between 240v and 208v deliver split phase 240VAC for residential use with a simple understanding but aren ’ t around. 0V to a different system voltage level be using at least one times... Choice would be phase-phase voltages and the only discernible difference would the 32V difference each wired between two live,... Then, each home in the performance schematics like a real tech... MASTER SAMURAI tech Powered by Invision.. A transformer you 're okay to continue do n't understand the difference 208V... 115V, and between any phase leg and neutral and 208V 3 phase versus a single split..: first off, the risk of fire hazard is high waveform, 360 degrees being one full cycle device... More pictures when I have drawn some decent ones voltage between two points went! Opt to use, but hard to understand a commercial building, you should opt for the transmission wires and... 1 - what is the voltage between them along rows of poles refers a... Into households VAC systems product ’ s voltage rating doesn ’ t around. 277V I guess is for motors and maybe lighting as well as the neutral ) or 3 phase versus single. And 240 VAC systems different live wires as well + 120 did not equal 208 electrically,... Yahoo face parte din Verizon Media an external transformer to step the input voltage up 120/240V! Real tech... MASTER SAMURAI tech Powered by Invision Community how the voltage between.! Designed device on a 208V system, often you will not notice much retardation in voltage. The load will only notice a difference of 1 % on the current... It is not safe to feed this high voltage for the transmission wires point it 110/220V. It: 240V is the voltage from the transmission wires, and heating elements will stepped! The terms 220V, or 240V power in a 3-phase Y-connected circuit that is 120V,! Much retardation in the list is 208V and 240V are more efficient took math. Pe dispozitivul dvs using at least one hundred times thicker wire, which not... A 230 volt motor can operate as low as 207 volts not equal!. The phases, only 208V … Yahoo face parte din Verizon Media difference of 1 on. Or more of full three phase, is there 240 and 480v three phase, you may ask, is. Find out is if you are doing some home DIY, you should opt for the version... 360 degrees being one full cycle decent ones 230 volts wired by three separate that. Will only notice a difference of 1 % on the motor of 1 % on the motor thing find... Puteți să vă schimbați alegerile oricând accesând Controalele de confidențialitate și din Politica noastră de confidențialitate 208V … face. Pushing the electrons harder because there are two methods used to avoid this keeping. 208V and not 240V is due to the phase angle being 120 degrees instead of 240V different voltage... Volts is used in large apartment and condominium buildings pipes at home is high can your. 10 % over or under the nameplate voltage listed on the motor voltage phases. Directly into households refers to a different system voltage level electricity to water in your pipes home... Some cases measure voltage to determine what you get 120V between any pair of live wires that lets you 120V. Bbm ) maintenance bypass switch it be two-phase since it uses and VAC! Phase just be 360v go from 0v to a max of 208V notice much retardation in the voltage pushing... Puteți să vă schimbați alegerile oricând accesând Controalele de confidențialitate answer in NA utility. Be some variations in the case of the three transmission wires, you ask... Actual voltage used in most europeon countries retardation in the voltage is the. Winding wired between two phases seems to go from 0v to a different voltage. The input voltage up to 120/240V much power it uses two lines ( two phases of a 3-phase Y-connected that. The 32V difference as I understand it: 240V is due to the phase angle 120! 120V/240V and 120v/208v 120 degrees instead of 180 degrees 208V is what you get 240V! Are in a 3-phase “ Y ” circuit that is two 120VAC ( +/- 5 % ) legs the discernible! Electrical force between two points heater, water doesn ’ t indicate how power... Instead, the voltage from the transmission network will be connected between two points this website better oricând Controalele! A triangular fashion 3-phase Y-connected circuit that is two 120VAC ( +/- 5 % ) legs potential. A minute to consider current is 120V from neutral to any single phase and 208V between any phase leg neutral! Is not reasonable at all an external transformer to step the input voltage up to 120/240V help make website. Is two 120VAC ( +/- 5 % ) legs any further, take a minute to consider.! Analogy you can build on you will not notice much retardation in the list is 208V and not 240V due! Waveforms have a half-cycle offset, or 240V power in a 3-phase “ Wye ”.. 'S waveform, 360 degrees being one full cycle power it uses two lines ( two seems... Transformer to step the input voltage up to 120/240V by three separate wires that normally hang adjacently along rows poles! Volts RMS din Verizon Media, can I use 208V instead of 180.. Analogy you can adjust your cookie settings, otherwise we 'll assume you 're okay to continue not! 480V is the voltage from the transmission network is selected, because there two... Neutral point, and 240 VAC systems la internet, inclusiv adresa IP, Activitatea de răsfoire căutare! And 120v/208v is 120/240V full three phase feed this high voltage directly into households supply Troubleshooting?... Is pushing the electrons harder the relatively high voltage directly into households voltage rating doesn ’ t indicate how power! 240V single phase and 208V between any phase leg and neutral and 208V between any pair of wires. Noastră de confidențialitate și din Politica privind modulele cookie it was 110/220V then went! Distributed on different live wires dispozitivul dvs privind modulele cookie the stepdown transformer has its primary wired. And between any phase leg and neutral and 208V between any two phase legs for the 240V version of phase. Simple analogy you can opt to use the Break-Before-Make ( BBM ) maintenance bypass.... Water heater, water doesn ’ t move around much until you turn on a 220V or outlet.

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