Enforceable? The only enforcement I've seen is performed by government contracting officials or big company legal departments.
These standards are written mostly to ensure network performance, preventing EMI, etc. so the only ones really following them are the professionals.
There's even an FCC (U.S. Federal Communications Commission) standard that specifies twisted pair for residential telephone cabling, but some home builders still use the old 4-wire stuff.
The major network equipment manufacturers have stipulations in their product warranties that only cover equipment if it's been installed according to the standards.
As for the pull string: The first person using the conduit usually fishes one in, and pulls in another one with the data cables, so there's always a pull string ready for the next pull.
Of course, if the EC's conduit installation contract specifies NEC and 569-A (or 570-A for residential), then it's the electrician's job.
James
