I know the why..or at least I know why I wouldn't do it. I just wasn't sure if it was actually code or just a REALLLLLY good idea.
To try and summarize the "why", suppose one of the 120V conductors has a bare spot (for whatever reason), and suppose the phone line does too in the same spot (I know, alot of supposing, but theoretically it COULD happen). Then the phone line is charged with 120V which is, not only bad for the phone system, but really bad for the next poor guy that gets into the phone box, and who knows how far the 120V could go back up the line...CI at your house, the next house...the pole down the street..farther???
Also has to do with the heat rating of the wires.Wire used for line voltage has a much higher heat rating than low voltage wire,so theoreticly the heat generated by the line voltage under a heavy load could melt the low voltage wire.Plus as stated earlier the EMI coming from a load on the line voltage can cause problems with phone lines/speaker wire.Phone wire can shock you,especialy when its ringing.Tip is about 24-30volts and ring is about 70volts.Her is a fun trick!Remove a phone jack and place a finger from one hand on the green and a finger from the other hand on the red.Now have a friend call your house number!It's just a slight tickle.
I am not sure how well he knows his job - that is why I am here. I appreciate the feedback from you guys!
HELLO!!!! Michael, what are you doing?! Why are you hiring someone in which you haven't full confidence of his abilities / skills? Please don't tell me it's because of a low price. If so, he probably stole the galvanized conduit somewhere.