Looking for DIY Subsoiler to install direct burial 4/0,4/0,2/0,4 URD

[jenkinsph]

Won't happen. That cable needs 24" of cover and you don't have the HP to dig that deep. I'd suggest a chain trencher if the soil is clear or a mini excavator if it's rocky.

Also, because this is a sub panel, I believe you need the neutral to be the same size as the conductors. Don't forget to include a disconnect in the building.

I agree with using a trencher or backhoe/excavator for this project. I would not try to save money on the trench at the expense of possibly damaging the wiring. Two hundred feet is a long way to pull the wires through the ground and doubt you can do it without some damage. This damage might not show up for a couple of years but reworking will cost even more money.

If you want to pull something through the ground that far leave it to cheap pipe not expensive feeder cable.

 

[BHD]

on a project like this you do not pull the wires in, you, feed the wires in, the difference is the machine is similar but one pull an done has a tube that guides the wire or what ever in the bottom of the cut trench,

Astec RT1160 Cable Plow Demo - YouTube

 

[BWSSR]

try this one: copy and paste to your browser....I guess
3pt. Subsoiler/Poly Pipe Trencher - TexasBowhunter.com Community Discussion Forums

 

[GPintheMitten]

Kenny d's also was designed to feed the cable rather than pull it.