DaveC wrote:

Four AWG #1 conductors in 2-1/2 inch EMT. 50 ft of conduit, four 90 deg.
elbows.

Is this combination reasonable to pull with some lubricant? Or should I
plan some "pull boxes" in this run?

Thanks,
For each 180 degrees of bend you must place a pull box, NEC requirement.
--
JosephKK