Does anyone remember the formula used to calculate how much force is needed to pull wire through a conduit?
here is a.pdf from Southwire it's kinda long but I think
the stuff you're probably looking for starts near pg.10
http://www.southwire.com/Southwire/Documents/Power%20Cable%20Installation%20Guide.pdf
here is some more
the max tension should not exceed .008 times of the CM when pulled with a pulling eye attached to the copper conductor
Tm =.008 x N x CM
Tm = max pulling tension,9lbs)
N = number of conductors being pulled
CM = circular mill area of each conductor
there is a bit more to this than I typed..now I'm curious, are you having problems pulling that wire out ??
there are other articles @ Southwire that might have that info too....