If you are digging a trench, you might consider a separate conduit for low-voltage. I did a 40 amp 220V sub-panel (for an inground pool) and a separate 1" low-voltage conduit. I eventually ran 2 Cat-5,(phone and internet), 1 Co-ax,(TV) and two 16ga speaker leads (audio) through the conduit once I figured out what I wanted. The pull was a family affair, one kid and myself feeding wires, one greasing and one pulling.
