Stranded ground wire in conduit

[Nomechanic]

I am running six new 220 circuits in conduit to some feed bin fans, unloading augers, etc next to my detached garage. The motors pull 8-17 amps (FLA) and are 75-80 feet from the panel so I'm using 10ga wire. I purchased spools of black and yellow 10ga stranded THHN, and I'm wondering if I can run a smaller gauge like 14ga for my ground wire to save a few bucks? Also, is OK to use stranded wire for ground? Thanks!

 

[sberry]

Stranded is ok but it needs to be 10 if you are going to use one.

 

[wyliesdiesels]

Backup.

Wire for Motor circuits is sized by HP NOT FLA.

So what is the HP rating on the motor?

What voltage? Single phase or 3 phase?

 

[Nomechanic]

Thanks for your replies. Sorry I didn't provide enough info. I'm wiring to the following motors:

(2) fan motors - 3hp / 1ph / 230V
(4) auger motors - 1hp / 1ph / 230V (Baldor farm-duty)

 

[sberry]

What kind of pipe? The wire size is good. All in one pipe? You only new 1 per pipe. If in 1 there could be possible creating issues but this is likely not much a real issue, all running at once? Since some are only 1hp not so much a problem and if there was a problem meeting the letter of it could be done with a breaker change. Wylie could elaborate better than I could.

 

[TheEquineFencer]

Backup.

Wire for Motor circuits is sized by HP NOT FLA.

So what is the HP rating on the motor?

What voltage? Single phase or 3 phase?

You're damn good at things like this from what I've seen. You seem to think more in depth than most!