Just to join the chorus, I can think of two areas where one might routinely place a cable inside EMY for protection.
The first is the typical basement with exposed wiring. You're supposed to 'protect' the wires to a height of 6-1/2 ft, so cables run down to devices will often enter a pipe as they exit the ceiling level.
The second situation is where a cable passes through a 'classified' location. Often, the cable will be passed through a pipe, making the cable "outside" the classified location.
