Electrical outlet in low voltage bracket?
What sort of joker did that?

Clearly, whichever joker did that needs to be sent back to their apprentice electrician's training, because line voltage connections need to be in a box!  If you see them around again, be sure to thwap them upside the head with NEC 300.15 for me, OK?  (P.S. none of the exceptions in 300.15(A) through (L) apply to this situation.)


  300.15 Boxes, Conduit Bodies, or Fittings - Where Required. A box shall be installed at each outlet and switch
  point for concealed knob-and-tube wiring.
  
  Fittings and connectors shall be used only with the specific wiring methods for which they are designed and listed.
  
  Where the wiring method is conduit, tubing, Type AC
  cable, Type MC cable, Type MI cable, nonmetallic-sheathed
  cable, or other cables, a box or conduit body shall be installed
  at each conductor splice point, outlet point, switch point, junction point, termination point, or pull point, unless otherwise
  permitted in 300.15(A) through (L).