Sparky,
In a rope rescue class I was taught that moving nylon straps on any type of pastic was something to avoid. They said there was too much heat build up and the nylon could fail. Of course this was for life safety not pulling wire. I've never tried a nylon strap, but often use rigid 90s in under ground runs. I've also had good luck soaping the pull rope.
Don(resqcapt19)
