wire size for pump motor/house

[sherrod624]

I need to wire a 240v 1hp well motor that is 180 ft away from my house. I would also like to have a 120v light and receptacle in the pump house. From what I've gathered I can run the pump off of #12 cu. what would be the best code approved way to get the 120v for the light and receptacle? I was thinking run 12-3uf to a 6throw main lug panel like this

http://www.homedepot.com/p/Square-D...oad-Center-with-Cover-HOM612L100SCP/100190554

but surely I wouldn't feed it with a #12 feeder from 180 ft away

the pump used to be wired up to another structure that is now gone. it was wired to a 30amp breaker before. im not sure but I don't think this is correct.

any help on what is the best way to do this would be greatly appreciated

thanks

 

[sberry]

It could be wired to 30A but 12 is too small at that distance especially for an outlet. For just the pump it probably would work fine. You should have a 10 if the wire is to serve them both and what are you going to put on the outlet. For a simple tool use its not a deal especially if its not being used at the same time,,, electric heater is another matter. Since you are adding a panel number 6 alum would be ideal and probably cheaper than 10 cu as well as give plenty/better service.

 

[wyliesdiesels]

Doing the voltage drop calcs, #12 is fine for the FLC rating of 8a on a 1HP motor.

However, in-rush current may cause excessive voltage drop so u could use 10/3 UF-b to be sure. And if u plan to use the outlet for power tools u should go with #10

I assume the pump has a starter. The overload protection would be in that.

20a would be fine for the feeding breaker.

And motor circuits can have breaker ratings that are higher than the wire ampacity rating.