Screenshot of puzzle in question:
map: bm_c4a1c1
position: setpos 8163.332520 3484.216064 6560.161133;setang 3.615621 90.012772 0.000000
If one of the two wires (regardless of length) connects the ceiling to any of the three outlets (regardless of broken or normal), that wire stays connected permanently, unable to be unplugged by player. That means if the player makes a mistake, they are unable to undo it and become permanently stuck.