480 volt single phase

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strawburner

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I have a 480 volt single phase service for a irrigation project. It is 480 phase to phase and 240 phase to ground. Can I run a 230 volt submersible 7.5 HP single phase pump on one phase and the grounded conductor. Will the voltage be stable?
 
rlundsrud said:
Wouldn't the voltage be 277 not 240?
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Not if it is a single phase 240/480 three wire service. Which is pretty much what the OP suggested.

But there has to be a grounded neutral conductor from POCO, not just an earth ground for a 240 connection to be allowed.

Tapatalk!
 
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strawburner said:
I have a 480 volt single phase service for a irrigation project. It is 480 phase to phase and 240 phase to ground. Can I run a 230 volt submersible 7.5 HP single phase pump on one phase and the grounded conductor. Will the voltage be stable?
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I would think you would be fine doing so.
 
Sure can--work fine -- last long time, as long as you have a poco neutral
 
You will find that the 230V motor is designed and rated for operation on a 240V system, just as 480V motors on three phase system are actually rated 460V.
 
strawburner said:
The voltage is 240 and it does have a grounded neutral from POCO could I not wire it up like any 120 volt application?

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Interesting. I have never worked on one of these set ups without all the loads after the phase converter.

It would be like using two legs off a corner ground I suppose. The motor won't care. Take some pictures for us.
 
strawburner said:
I have a 480 volt single phase service for a irrigation project. It is 480 phase to phase and 240 phase to ground. Can I run a 230 volt submersible 7.5 HP single phase pump on one phase and the grounded conductor. Will the voltage be stable?
Click to expand...

I have done this before. I have a similar situation coming up but is supplied with 480/277 three phase in that case. I am planning to connect the submersible with a buck boost transformer going from 277 to 240 volts on that one.

The 480/277 is for the crop irrigation equipment - center pivot which are almost always 480 volt machines, and a 75 hp well. There was an existing domestic well only 300 feet away from old farmstead that they now wish to use for watering cattle, it is only 3/4 hp but is much more suitable for cattle watering of small herds then the 75 hp well is.
 
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