Conduit in a trench
If you’re running rigid PVC conduit,
most trenches need to be 18 in.
deep, but ask your electrical inspector
how deep to dig the trench for
your specific project. You can run
Schedule 40 in a trench, but use
Schedule 80 wherever the conduit
comes up out of the ground (see
“Schedule 40 vs. 80” above).
Assemble all the conduit first and
plop the whole thing into the trench
when you’re done. Much easier and cleaner than working in a trench!