How many amps is a 50 kva transformer good for? The device should be marked with the voltage range it works over. 240 volt motors run on 208 volts. 250 volts is well above 208 volts +/- 10% that is generally suggested for voltage tolerances. Most devices designed for 220 will run on 208 and in shops all over the place this is commonly done. In some cases it may be a matter of relocating two wires with spade terminals or ring tongue terminals, and then the LINE or power source wires will attach as described. Naturally I'll follow the lower voltage wiring diagram on the motor. Most devices designed for 220, The most common commercial building electric service in North America is 120/, When it comes to electricity usage, an electric. I would wire it up and put an amp probe on it, if the current draw is within reason, you should be fine. If the service was a pure 208 volts, at a minimum, then the motor … If you need larger than #8 or #6 though, you willhave to buy service or "service type" cable. In a commercial or industrial setting, three-phase motors are often rated at 460 or 2,300 volts rather than the 480 or 2,400 … e.g. Unground-ed systems are usually found in older facilities. The actual peak voltages are. The nominal voltage is 240 volt, but homes may have 208V, 220V, or 240V power supply. "Generally available power supply voltages for single phase are 120 volt and 240 volt. Hook the the 240 volt motor to the 120 volt supply just like you would hook it up to 240 volts. Wire an Electric Motor to run on both 110 and 220 volts I use this for my table saw that I use in different locations to quickly change the motor to run on either voltage. To learn more, please refer to the cookie policy. I mean a 240V motor could be 50 Hz, and your supply is 208V which sounds like the phase to phase voltage of a 120V supply, which I expect is 60Hz. On appliance labels or the labels on other motor-driven equipment, the rated voltage never equals 240 volts but is rather specified as 230 volts. A 240 volt range can operate on 208 volts but the range's wattage will be reduced. When this approach is taken, the motor manufacturer is essentially saying that this motor can be successfully operated on voltages as low as 208 minus 10% or 187 volts. If a motor is started frequently, lower voltage will make it last longer because of reduced magnetizing and locked-rotor current. The low-voltage version is represented by a 120/208-volt system. I have 240 volt, 3 phase electricity available to me. Member. It may well have been a 240 volt heater to begin with. This can cause twoproblems. Now we have the best of both worlds. I connected a 240 volt elevator motor that was about 1940 vintage to 208 volts and it has been okay for a decade. 250 is the connector rating. Most AC motors are built to tolerate a 10% variation from nameplate voltage. Most motors that are rated at 230 volts will run on 208 volt power, although this is not recommended. This way, these areas have 120 volts to run their equipment from. Your best bet might be to just replace the motor with a … « Reply #8 on: January 12, 2013, 06:53:00 pm » Quote from: SeanB … The need to get 240 volts instead of using 208 volts for 240 volt loads is not what I will be discussing here. On appliance labels or the labels on other motor-driven equipment, the rated voltage never equals 240 volts but is rather specified as 230 volts. I know alot of single phase motors are labled 230 volts and we put them on 240 … All Rights reserved. Prev ... That is my experience, too. What is the difference between 240v and 208v? If you want to discuss that, please start a new thread. If it is a 208/240 motor you need to plug it into a drier socket with 2 hot wires to run it from the 208v the drier uses. This instructable is about running a single voltage 240 volt motor on half of the voltage it was designed for. The dryer still uses 120 volts for the motor and the controls, by the the use of the neutral. For this reason, three-phase motors are common on industrial and restaurant equipment, while similar equipment can be difficult if not impossible to find with a single-phase motor. This is a unique US system. you can buy a buck boost transformer but it's realy not needed. The motors that are truly intended for 208 volts are nameplated for 200 volts. 208 is nominally the voltage of a single leg off a 3-phase supply. But; Most 230 Volt 3 phase motors are dual voltage and will run on either 240 Volts or 480 Volts. Leave the third leg from the rpc alone, send it straight into the motor, as its voltage will drop under load anyways. Most of the time you see 208 volts on 3 phase and 230-240 on single phase. The nominal voltage is 240 volt, but homes may have, 220-230-240 (depends on utility) is the standard nominal 1-phase voltage across both legs of the line (120 nominal being the voltage from either leg to neutral). You can distinguish between a 120 volt outlet and a 240 volt … voltages on the motor's nameplate. Copyright 2020 FindAnyAnswer All rights reserved. 240 volt motors will have a stronger start compared to a 120 volt motor. If it's 460V star on the Nema motor plate, just bridge the motor terminals in parallel/Delta and it will run on 220V 3phase. 208 volts is the high leg voltage, measured from the centre-taped neutral on a 240 volts 3 phase system to the blue wire. I connected a 240 volt elevator motor that was about 1940 vintage to 208 volts and it has been okay for a decade. Just don't try to run a120 volt motor on 240 volts. Jump to Latest Follow 21 - 27 of 27 Posts. If your phase converter is actually putting out 220V you should be fine, but I suspect if your power is anything like mine, you will be closer to 240V. Since there is a voltage drop between the power source and the electric motor, the single phase motors are rated either 115 volt or 230 volt. A simple thing to remember is that a motor that is designed to run at a given voltage and 5 HP, for example, but applied at a lower voltage will draw more current because because you can't get something for nothing, that to get 5hp when the voltage decreased, the current must increase to provide that 5hp let alone considering torque. GTB. If you put 240 volts to each circuit it will pull around 23 amps per circuit- which is too much. Copyright © 2021 vBulletin Solutions, Inc. All rights reserved. Among these are 240 Delta, 120/240 3-phase 4-wire delta with a "wild" leg (High-Leg Conductor Identification, NEC 110.15) and the above. One: very high cost on long runs. Find answers now! For this reason, three-phase motors are common on industrial and restaurant equipment, while similar equipment can be difficult if not impossible to find with a single-phase motor. You accept the use of cookies or other identifiers by closing or dismissing this notice, by scrolling this page, by clicking a link or button or by continuing to browse otherwise. You can usually get your basic sheathed xx/2 and xx/3cable up to 6 guage. Residential power is usually in the form of 110 to 120 volts or 220 to 240 volts. 2) Inside the 480 Three-Phase panel, you will also require the appropriate Over current Protection Device as a means of disconnect to shut down the transformer, which in turn will also disconnect the 120/240 Single Phase panel. If you want to do the proper thing, get yourself a pair of buck/boost transformers to boost your voltage to 230. No. © 2021 Copyright Practicalmachinist.com. There are manufactures now making ranges that operate off of 208 volts. If your phase converter is actually putting out 220V you should be fine, but I suspect if your power is anything like mine, you will be closer to 240V. Power company's spec a + or - 10% on voltage. You can operate a 208 volt motor or appliance on 240 volt, but that will decrease life expectancy by 50%. 1 Questions & Answers Place. Sometimes you will hear the voltages reversed, such as 208/120 volt 3-phase 4-wire wye. If they are 240 delta and your power is 208 wye then you will need a dry type transformer, no big deal but it will be needed to keep the motors happy. Just try running your appliance on 208 …
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