240V wiring in shed with irrigation pumps
I am hoping to get some questions answered after doing some reading on your forum about 240V wiring. I have a shed that is about 250 ft from the house. I have torn the shed down in order to replace it. It has 2 hot leads (240V) that run irrigation pumps that are switched on and off up in the house next to the breaker box. There is also a 12/2 with ground run out for lights and outlets.
I have more power needs and wishes than what the 12/2 can provide so what I would like to do is, move the 240V irrigation on/off switch into the shed and use the 12/2 as the signal wire to control it. I would then power a sub panel with the (2 hots) 240V and put the on/off switch for the irrigation pumps after it. The only issue with this, is there is no neutral and no ground run out to the shed just 2 hots.(I'm thinking a sub panel needs a neutral) I could drive a ground rod to provide a ground path but I'm just not sure that will fly. Its way too far to run more wire to the shed from the house considering the whole area has irrigation too. Any ideas or insight would be greatly appreciated.