I didn't use 1-1/4" conduit because my second floor walls are only constructed from 2x4's, and punching a 1-1/4" conduit through the top plate would take away too much structural wood in an already minimal design. On my 5/12 pitch, 2x4 truss roof, turning the corner after punching through the top plate on the wall doesn't fit using conduit and working bend radii. That's where the UF cable really became the best option.
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