Mike, ran details through computer program
2 x 95mm2 alum xlpe in parralel assumed ze .01 16ka fault level. max cable length = 76 meters. voltage drop = 6.78
at 300 amps zs at load end = .048 ohms
circuit protective device Merlin Gerin NS400H MA320 320amps 50mm2 CPC required.

Check it out with cable manufacturers
Alan