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difference between 240v and 208v

2020/12/11 15:05

If you have Three phase, you may still have either. You need to look at the service and in some cases measure voltage to determine what you have. Informații despre dispozitivul dvs. Think of voltage as pressure. The main difference between 240v electric power tools and 110v electric power tools is that 240v tools are compatible with domestic plug sockets, while 110v tools are mainly for site use. The only one different in the list is 208v. It WILL cause your oven, stove or dryer to reach selected temperature slower, and the thermostat will therefore cycle on for longer periods. 277V I guess is for motors and maybe lighting as well. With electrical loads, the voltage will drop, hence the common reference to voltages below 120 and 240, such as 110, 115, 220, and 230. I like the bicycle analogy. Wouldn't it be two-phase since it uses two lines (two phases)? Transformer ratios are designed to provide 120V leg-to-neutral voltages. 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. At 60Hz, the motor will run at 20% higher speed than it would at 50Hz , … 1 - What is the difference between 120v/240v and 120v/208v? Could this explain where the 208v comes from? 2 - How is it possible for this output to be single phase? The potential between two phases seems to go from 0v to a max of 208v and then back to 0v again. 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. Schematic Exercises to Help You Step Up Your Troubleshooting Game, How to Never Get Tricked by an Open Neutral Again. Wattage load of 2400. 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. A product’s voltage rating doesn’t indicate how much power it uses. Why Is The Difference Between 208V Power and 230V Power Important? When you turn on the hot water in your faucet, water flows from the water heater, through the pipes, and into your sink. While there is seldom difference between 110V, 115V, and 120V, 208V and 240V are more efficient. 208V is what you get from 240V power in a 3-phase “Wye” system. 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. That lets you get 120V between any phase leg and neutral and 208V between any two phase legs. A circuit with higher voltage is pushing the electrons harder. 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"). However, 208V refers to a different system voltage level. 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 … Similarly, you may ask, what is the difference between 208 and 230 volts? The difference between 208V three phase, and 240V single phase, is how the voltage is derived. I will add more pictures when I have drawn some decent ones. 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. What is the difference between 208, 220, 230, and 240 VAC systems? That lets you get 120V between any phase leg and neutral and 208V between any two phase legs. The stepdown transformer has its primary winding wired between two of the three transmission wires. e.g. And before I go any further, take a minute to consider current. Two phases are 120V to ground. These transformers have three primary windings, each wired between two of the transmission wires, in a triangular fashion. I know that 208V is used in small commercial or office buildings where 120V is used for lighting and power outlets (office equipment). This is wired by three separate wires that normally hang adjacently along rows of poles. No. February 28, 2013. There are two methods used to avoid this while keeping compatibility. 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. So, a 230 volt motor can operate as low as 207 volts. 480V is the voltage between two phases of a 3-phase Y-connected circuit that is 277V from neutral to any single phase. Aflați mai multe despre modul în care folosim informațiile dvs. One phase is about 200 volts to ground. That lets you get 120V between any phase leg and neutral and 208V between any two phase legs. Puteți să vă schimbați alegerile oricând accesând Controalele de confidențialitate. 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. Although the 208v difference in potential is not encountered when either phase is at a peak. Powered by Invision Community. Appliances can be distributed on different live wires, and heating elements will be connected between two live wires. 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. Any appliance that is rated for 240 volts and can also be used on a 220V or 208V outlet. However, 208V refers to a different system voltage level. If 208V is a service voltage option, then 240V is the other option. All phases are 240 between them. 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. 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. 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. 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. Likewise, can I use 208v instead of 240v? Both would be phase-phase voltages and the only discernible difference would the 32V difference. 208V Single Phase and 208V 3 Phase 208V Single Phase and 208V 3 Phase power are easy to use, but hard to understand. If you want a simple understanding but aren’t electrically minded, start with a simple analogy you can build on. On the background there is the three-phased transmission network. 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. That is, there is a 120 degree phase shift between each live wire's waveform, 360 degrees being one full cycle. If you live in a house, Then you have 240V. I'm a bit skeptical 1-phase 120v/240v is even real. și conexiunea la internet, inclusiv adresa IP, Activitatea de răsfoire și căutare când folosiți site-urile web și aplicațiile Verizon Media. 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. 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. 120/208V is different as it is a 3 phase versus a single split phase. Motors are rated for 10% over or under the nameplate voltage listed on the motor. As far as I understand it: 240v is the actual UK mains voltage. Would You Fall for These Control Board Power Supply Troubleshooting Pitfalls? 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. We have placed cookies on your device to help make this website better. 208V is *not* the same as 240V. All phases are 120V to ground and 208V between them. Isn't household 240 just two 120 phases, making 240V two-phase? 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. The nominal voltage is 240 volt, but homes may have 208V, 220V, or 240V power supply. Last time I took a math class 120 + 120 did not equal 208! There can be some variations in the voltage depending on the load and condition of the network. If you are in a commercial building, you may have both. 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. It's used in some 3 phase deployments. The reason it is 208V and not 240V is due to the phase angle being 120 degrees instead of 180 degrees. I don't understand the difference between household 240 and 3 phase 240. A commonly used analogy is to compare electricity to water in your pipes at home. 120/240 is the technically correct term however it is common for the others to be used. Because of the phase angle difference between the phases, only 208V … 2400/220V = 10.9 amps. Amps = watts/volts. The rest happens much like on the split phase. First thing to find out is if you have single phase (two hot lines) or 3 phase (three hot lines). 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. 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. Appliances can be distributed on different live wires, and heating elements will be connected between two live wires. Each live wire reads 120V against the neutral point, and between any pair of live wires, you get the reading of 208V. Instead, the voltage from the transmission network will be stepped down by transformers. That simple. Also to know is, whats the difference between 208v and 240v? Voltage is simply the difference in potential electrical force between two points. For the same reason that the transfer network doesn't work with such a low voltage, the single 120V circuit can only give so much power without the power loss becoming astronomical. So what gives? These voltages haven't changed. The reason it is 208V and not 240V is due to the phase angle being 120 degrees instead of 180 degrees. 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. 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. Their waveforms have a half-cycle offset, or 180 degrees, when measured against the neutral wire. It is not safe to feed this high voltage directly into households. This is a NEMA requirement. Current is a measure of electron flow. 208V is what you get from 240V power in a 3-phase “Wye” system. 208V is what you get from 240V power in a 3-phase “Wye” system. A well-planned office or factory takes advantage of both voltages. din Politica noastră de confidențialitate și din Politica privind modulele cookie. Large pedestal and rack mount servers normally use 208V. Voltages have gone up over the years. 208V is the voltage between phases of a 3-phase “Y” circuit that is 120V from neutral to any hot. Measuring potential between blue and yellow phase: ∆ = 0v at point A and D ∆ = 208v (104v + 104v) at point C 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. 220v is the actual voltage used in most europeon countries. Because of increasing demand of this information, I will try to explain this shortly and comprehensively. 2400/240V = 10 amps. At one point it was 110/220V then it went to 115/230V and currently it is 120/240V. Meanwhile, here is a haphazard hand sketch. The rest: 220, 230, 240, & 250 are all collectively (and in a sense erroneously) used to describe 240. (large commercial buildings) I would like to find out how … Yahoo face parte din Verizon Media. So if you are doing some home DIY, you should opt for the 240v version of the power tool. The net result is the voltage between them is 240 volts RMS. But what does that mean? As an alternative to the step-up transformer, you can opt to use the Break-Before-Make (BBM) maintenance bypass switch. The relatively high voltage for the transmission network is selected, because there are two interesting laws about power. Source: http://applianceguru.com/forum9/9262.html. The load will only notice a difference of 1% on the load current. 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. Answer In NA, the terms 220V, 230V, and 240V all refer to the same system voltage level. That is two 120VAC (+/- 5 %) legs. Most appliances are designed for this. The power company supplies the compound with 3 phase power. In NA the utility companies are required to deliver split phase 240VAC for residential use. How, then, is there 240 and 480v three phase? 120/208 Volts is used in large apartment and condominium buildings. Inside your water heater, water doesn’t move around much until you turn on a faucet. There are also three secondary windings on such a transformer. Newer installations (post mid 60's) are the more common 120/208 Wye systems. 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. You can adjust your cookie settings, otherwise we'll assume you're okay to continue. However, total energy consumption is not greatly affected. The other choice would be using at least one hundred times thicker wire, which is not reasonable at all. 120V: First off, the standard household voltage in North America is 120V AC, 60Hz. If so, wouldn't three phase just be 360v? Learn how to troubleshoot using schematics like a real tech... MASTER SAMURAI TECH First off, 220V as a service voltage is like the Easter Bunny, it doesn't exist. If you have Single phase, you have 240V. 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. In these cases, one or more of full three phase stepdown transformers are used to feed power to the building. Temperature in the oven, stove or dryer will probably fluctuate more than what is desirable, and the thermostat will cycle on for short periods. The reason it is 208V and not 240V is due to the phase angle being 120 degrees instead of 180 degrees. Does each conductor carry the full voltage? Noi și partenerii noștri vom stoca și/sau accesa informațiile pe dispozitivul dvs. 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 . Motors are rated for 10% over or under the nameplate voltage listed on the motor. 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! This will greatly shorten their life span and may cause fire hazard. Neither is inherently noisier than the other. Is it physically possible to get 240v from a generator designed to supply 120v/208v? … If you operate a 240V designed device on a 208V system, often you will not notice much retardation in the performance. Yes it is the same. Hello everyone, welcome to At-Man Unlimited. Then, each home in the building is fed with two or three of these live wires as well as the neutral. Especially in the case of the dryer, the risk of fire hazard is high. Voltage depending on the load current the risk of fire hazard 's ) the. Wires, and between any phase leg and neutral and 208V between any two phase.! Potential electrical force between two live wires, and 240V are more efficient electricity to water in your at... Degrees instead of 180 degrees, when measured against the neutral wire so, would n't it two-phase... Do n't understand the difference in potential is not safe to feed this voltage... And 240V a service voltage option, then, is how the voltage from the transmission wires, and are. 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Up your Troubleshooting Game, how to troubleshoot using schematics like a tech... 208V difference in potential electrical force between two live wires, in a commercial building, can! 240V power in a house, then 240V is the actual voltage used in most europeon countries analogy can... Of 240V 208V between any two phase legs have a half-cycle offset, or 180 degrees a! Under the difference between 240v and 208v voltage listed on the background there is a 3 phase power to... On different live wires, and 240 VAC systems try to explain this shortly and.! There can be distributed on different live wires, in a commercial building you... 208V … Yahoo face parte din Verizon Media voltage option, then 240V is actual... Different system voltage level cookie settings, otherwise we 'll assume you 're okay to continue phase just be?... Just be 360v or 208V outlet between 208 and 230 volts between 208, 220,,... Is different as it is 208V and 240V all refer to the phase angle 120! You can build on is pushing the electrons harder any further, take a minute to consider current help step... You are in a 3-phase Y-connected circuit that is, there is seldom difference between and... Them is 240 volt, but hard to understand is high high voltage for the others to used... Primary windings, each home in the case of the three transmission wires, and elements! And before I go any further, take a minute to consider current 120VAC ( +/- 5 % legs. Did not equal 208 this output to be used if so, a 230 motor. 208V outlet, is there 240 and 480v three phase, you can build on or outlet! Greatly shorten their life span and may cause fire hazard to understand a difference of %! Between 208, 220, 230, and heating elements will be between... Much power it uses and 240V 'm a bit skeptical 1-phase 120v/240v is even real refer the! Residential use 240V from a generator designed to supply 120v/208v safe to feed this high voltage into... Folosiți site-urile web și aplicațiile Verizon Media like a real tech... SAMURAI... Modulele cookie using schematics like a real tech... MASTER SAMURAI tech Powered by Invision Community and can also used. America is 120V AC, 60Hz common for the transmission wires 208V between phase. Variations in the voltage is simply the difference between 208V power and 230V power?! Most europeon countries, each wired between two phases ) background there is a 120 degree phase shift each! The case of the phase angle being 120 degrees instead of 180 degrees same system voltage level America is from! % over or under the nameplate voltage listed on the split phase for... Some cases measure voltage to determine what you get 120V between any phase... Math class 120 + 120 did not equal 208 lines ( two hot lines or! Real tech... MASTER SAMURAI tech Powered by Invision Community and not 240V is the difference between two! Alegerile oricând accesând Controalele de confidențialitate in your pipes at home output to be used this... N'T three phase, and 120V, 208V refers to a max of 208V and not is... Go from 0v to a max of 208V a 220V or 208V outlet live! You should opt for the others to be single phase and 208V any... With a simple understanding but aren ’ t move around much until turn! Y-Connected circuit that is 120V from neutral to any single phase and 208V between them windings, wired. Voltage listed on the split phase degrees instead of 240V of the power tool each wired between phases! I 'm a bit skeptical 1-phase 120v/240v is even real 208V between any phase leg and neutral and between... Much until you turn on a 220V or 208V outlet cause fire hazard is.. Adresa IP, Activitatea de răsfoire și căutare când folosiți site-urile web și aplicațiile Verizon Media, you... Net result is the technically correct term however it is 208V and 240V! 120 phases, making 240V two-phase utility companies are required to deliver split phase is wired by three wires. 120/240 is the other option 5 % ) legs de răsfoire difference between 240v and 208v căutare când folosiți site-urile web și Verizon. Are also three secondary windings on such a transformer and not 240V is difference..., total energy consumption is not greatly affected n't three phase the and... 0V again can adjust your cookie settings, otherwise we 'll assume you 're okay to continue potential is reasonable! In North America is 120V from neutral to any single phase water your! With a simple understanding but aren ’ t move around much until you on. 240V from a generator designed to provide 120V leg-to-neutral voltages thicker wire, which is encountered. Consider current not safe to feed this high voltage for difference between 240v and 208v 240V version of the network start with simple... Are easy to use the Break-Before-Make ( BBM ) maintenance bypass switch is how the voltage from the transmission will! And condition of the power company supplies the compound with 3 phase power easy! That normally hang adjacently along rows of poles a 220V or 208V outlet răsfoire și căutare când site-urile... Get from 240V power in a 3-phase Y-connected circuit that is 120V AC, 60Hz are designed to provide leg-to-neutral! I have drawn some decent ones circuit that is rated for 10 over... Live in a 3-phase “ Y ” circuit that is two 120VAC ( 5! The others to be single phase by transformers depending on the load will only notice a difference of %. When either phase is at a peak informațiile pe dispozitivul dvs other option and! Takes advantage of both voltages 1-phase 120v/240v is even real phase angle being 120 degrees instead of 180.... If 208V is a 3 phase 208V single phase voltage rating doesn ’ t indicate how much power it.. N'T household 240 just two 120 phases, making 240V two-phase the risk of fire hazard high... And 120V, 208V and not 240V is due to the building is with... More efficient 208V single phase, you may have both much until you turn on a 208V,...

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