I am almost 100% sure (>96.90023417%) that I have seen an IBM Specification note regarding 180° Maximum, for scenarios involving Conduit runs and pulling in Type 1/2 STP Cables.
Of course, this was back in the 1980's (the terminology of Type 1/2 should date its self!).
Let me dig up some of the legacy documents to see what's up.
As far as anything modern (>1995 A.D.), I had been given the 180° Maximum specification on the first FDDI Backbone Install I ever dealt with - circa 1999 to 2000.
Technology of the Cable was likely the reasons for the Paranoia - and this Backbone's Conduit Runs were filled with Pullboxes!
Ran from/to/between NERs on 3rd, 6th and 9th Floors.
Outside of the loops involved with the Pullboxes, the Cable Pulls were extremely easy!
(1 Fiber Optical Cable in an 1¼" Conduit tends to be somewhat easy to pull - even without Aqua Gel!).
The same cannot be said about the actual EMT / Pullbox installations!
That's where the
"fun part" came into play!
Scott35