I think thats white Romex, Sven.
Oh okay. My bad. Yeah if I look closely enough I can see that it's NM (especially in the first of the two shots that show the cable going into the box).
Thing is, I'm so used to seeing people use white 16-AWG/type SPT-2 cord as fixed surface-mount wiring that if I see white cable with that groove running down the middle the first thing that pops into my head is zip cord.
The fact that we don't use NM cable in most New York City construction also doesn't help.
P.S. Local code ammendments require type BX cable on multi-story buildings (I think more than two or three stories, I'll check tonight) and obviously commercial structures.