I'm adding another outbuilding to my yard and need to run some wire out to it. I would like to run a 40 amp circuit to it, which would require three #8 wires. To run this out to the building requires a ~100 foot buried conduit. I already have a buried 1/2" PVC conduit with #12 wires in it that goes to a chicken coop right next to the new building and I could save a lot of work by using that conduit. So, my plan would be to cut into that conduit near the new building, run it into the new building and pull the new wires through it. Conduit capacity charts say that 1/2" PVC can handle a maximum of three #8 wires. My question is how tight will that be? Will I be able to pull the new wires through that conduit? FYI, there are two elbows along the way and a total of about 90-100 feet of conduit. My other options are (1) digging a new trench and replacing the 1/2" conduit with something larger, which will require digging through tree roots and going under two sprinkler lines, or (2) downsizing to #10 wire and reducing the circuit to 30 amps instead of 40. I suppose I could try the #8 wire and then downsize if I can't pull it through, but I would rather find out it won't work before spending $100 on the wire.