On July 27, 2020 at 08:54, ericspencer said...
OP stated fiber was going in conduit.... Indoor/Outdoor fiber (at least those offered by major fiber mfg) is perfectly suited for this application. They meet GR-20-CORE and are fully water blocked.
Having water block tape/yarn is good. Not allowing the water to ingress into the cable in the 1st place, is better. I don't trust anything without a polyethylene jacket, in the ground for long term use.