240V Motor Rating Explanation
240V Motor Rating Explanation
(OP)
If a single phase motor is rated for 240V, what are the consequences if it is feed from a 208 single phase voltage source. Is there a NEMA or other standard that motors are manufactured according to? Can anyone explain how motors are rated and what type of motors are available for 208v Single phase voltage source. Thank you





RE: 240V Motor Rating Explanation
RE: 240V Motor Rating Explanation
Bill
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"Why not the best?"
Jimmy Carter
RE: 240V Motor Rating Explanation
"If I had eight hours to chop down a tree, I'd spend six sharpening my axe." -- Abraham Lincoln
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RE: 240V Motor Rating Explanation
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If we learn from our mistakes I'm getting a great education!
RE: 240V Motor Rating Explanation
I forget the details but I saw a small gen-set (about 1 KVA) earlier this year from an emerging nation. I remember thinking that if the nameplate data were to be posted as part of a question the OP may be red flagged for lack of basic professional knowledge. JUNK with capital letters.
Bill
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"Why not the best?"
Jimmy Carter
RE: 240V Motor Rating Explanation
What are the allowable minimum and maximum voltages that a 230 volt rated motor should be fed from (as per standard)?
If the 230 volt rated motor is fed from a 208 single phase voltage source, will it start (since it will be already feed from a lower voltage level 208 in this case) if the voltage drops five percent from the 208 nominal voltage. I acknowledge that it would be better to buy a single phase motor rated for 230/208 Voltage source. However, I am looking into feeding existing motors from a 120/208 single phase source.
Your assistance to this question is highly appreciated. Thank you for your time in responding.
RE: 240V Motor Rating Explanation
Called away, more later if you consider voltage boosting. How many what size motors?
Bill
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"Why not the best?"
Jimmy Carter
RE: 240V Motor Rating Explanation
nonsinusoidal; You have never said what your motor is going to run. If it's a drill press then it will likely have less power but not burn out. This would be because drill presses rarely run continuously nor are they usually fully loaded. It depends on what the motor's load is.
Keith Cress
kcress - http://www.flaminsystems.com
RE: 240V Motor Rating Explanation
http://www.brithinee.com/240vs208volts.htm
RE: 240V Motor Rating Explanation
Basically, if your motor says 240V and you supply it with 208V then it might not work, but then it might work. Should you do this? No, because you have a motor working outside of the limits assuming it is running at full load continuously. If it isn't running at full load continuously then we don't know.
RE: 240V Motor Rating Explanation
In refrigeration the compressors find themselves running continuously during the hottest part of the day, moving the maximum energy, while the utility voltage is the lowest, due to maximum network loading and possibly dial-back. A fatal mix for the poor motors.
Keith Cress
kcress - http://www.flaminsystems.com
RE: 240V Motor Rating Explanation
Then they come in and say "hey, we've saved 30% of your energy bills..!" sure, a third of the fridges have stopped working tosser..
RE: 240V Motor Rating Explanation
You may have issues running a 460:230V motor on 208 but when the nameplate says something like 460:230/208V 14:7/7.5A it should be safe on 208 Volts.
Bill
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"Why not the best?"
Jimmy Carter