240v equipment to 208v
- Thread starter texnwis
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360Youth
Senior Member
- Location
- Newport, NC
You are probaby going to see requests for more info. I am assuming you are running this fan single-phase 240v and want to hook up to your 208v system. I would say you have about 60/40 chance in your favor of it working ok. It depends on the exact voltage of your system. Most 208s that I see are putting out bout 214v, and I have seen 240v motors un just fine. Voltage is nominal, but it depends on what type of range the manufacturer has "allowed" for their equipment to run.
growler
Senior Member
- Location
- Atlanta,GA
There are all kinds of things to consider. The ambiant temperature where the motor is located ( heat is a factor when running at lower voltage ). The distance of the motor from the panel ( voltage drop under load). If you really have 208V when running there isn't much of a problem but if you start with 208V and add in a 10% voltage drop because of distance and conductors size then that's another thing.
The best place to go for advise when useing a piece of equipment is back to the people that built it. Call the manufacturer and see how they feel about it. They all have an engineering staff so let them earn their money and give out some answers.
ty
Senior Member
- Location
- 3rd Rock from the Sun
what is the wattage at 240v?
ty
Senior Member
- Location
- 3rd Rock from the Sun
maybe. somewhere in that area.
I know this is not a resitance load.
But, I was going to do a calculation for theory in seeing what it's connected wattage and full load current would be at 208v.
ty
Senior Member
- Location
- 3rd Rock from the Sun
so,
for calculation sake, let's say it is 3000watts at 240v.
R=E(E/P)
R=240(240/3000)
R=19.2
I=E/R
I=208/19.2
I=10.83
10.83x208= 2252.64
so,
connected watts = 2253
F.L.A. = 10.83
edit: at 208v.
for calculation sake, let's say it is 3000watts at 240v.
R=E(E/P)
R=240(240/3000)
R=19.2
I=E/R
I=208/19.2
I=10.83
10.83x208= 2252.64
so,
connected watts = 2253
F.L.A. = 10.83
edit: at 208v.
Mgraw
Senior Member
- Location
- Opelousas, Louisiana
- Occupation
- Electrician
All the calculations are great but the bottom line is it may work for a while and it may not. Depends on how close to full load amps it runs and how long it has to run.
mcclary's electrical
Senior Member
- Location
- VA
I agree, if the motor is lightly loaded, it will most likely work just fine, if it's on a compressor,,,,,I will bet money you'll need a buck boost (especiallly when it'd cold starting)
ty
Senior Member
- Location
- 3rd Rock from the Sun
I agree. Was just doing the calc as an exercise.keepin it fresh.
hillbilly1
Senior Member
- Location
- North Georgia mountains
- Occupation
- Owner/electrical contractor
Cow
Senior Member
- Location
- Eastern Oregon
- Occupation
- Electrician
Don't do it.
Call the manufacturer first, install a buck boost, or better yet get a 208v motor.
Call the manufacturer first, install a buck boost, or better yet get a 208v motor.
ty
Senior Member
- Location
- 3rd Rock from the Sun
Ummm, didn't I state that in post #7?? Before I even showed the calculation?
But, for a resistance load, I would bet alot of folks could use the calc., and some had no idea how to do it. It was just an exercise with the numbers, as stated. Not for the OP's use on his motor.
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