Underground services -

I am almost done with my underground power project, and getting ready to put the three required PVC conduit lines in the trench: one 2" and two 1" for power, cable, and telco.

Since I don't ever want to dig that stuff up again, I want to future-proof it if possible by placing any additional conduit lines in there if it makes sense. For instance, fiber might be a reality in the next 10yrs, and I see that special conduit liners are sometimes used for this so my existing lines may not be suitable. I also wonder if a metalized conduit line and/or a tracer wire make sense.