underground conduit still requires an outdoor rated cable!! you want a cable with a hard jacket, and "flooded" with silicon. All underground conduit will eventually fill with water. even if it is PVC with glued joints. conduit "breathes" from heat cycles. air expands and contracts. when it contracts inside the conduit, water molecules condense and collect.
Amen to that.
And on any Ethernet CAT-5e, 6 or 6a, no CCA (Copper Clad Aluminum), use all copper.
I totally agree with
@Trax95008 in that I also suggest you use outdoor-rated cable in underground conduit, because after over 31 years of pulling or replacing cable in buried conduit of all type (RGS, PVC, etc.) at NO time were conductors I pulled out or the bottom of the conduit dry. Some moisture gets into all conduits, oftentimes through the above ground fittings: the earth warms up & cools off as the sun rises and sets; as the earth (and the conduit) cools it draws in air from above-ground fittings and the moisture in the air condenses into water. This heat-cycling causes moisture to collect over time as it never gets hot enough to vaporize, expand and leave the conduit. It collects at the low points and, over time, your conductors are submerged in water 24/7. Conductors that have non-outdoor rated jackets will have water intrusion over time that will affect their performance, whether they be for data or voltage. It may not happen in a month, a year or even 2 or 3 but trust me...it will happen and you'll have down time and will be replacing some conductors after a lot of intermittent issues and troubleshooting.
I know, the jacket of outdoor-rated cable is stiffer and harder to work with above ground but it's easier to pull through conduit than the soft indoor-rated jackets. Do yourself a favor and spend the extra for outdoor-rated cable even in conduit. It's cheaper than you think initially than it would be later.
