well really....not everywhere has it.......
in fact......I only know Boston area having it...they just help locate fire alarm buttons or switches in case of emergency......
NYC has something similar...but its not using NEMAs...instead they used
The old NYC firelightThis one is the newer one that NYC currently uses with an old abandoned one
hereHere's an example of the fire switch...they were used more back then because that was before we were able to CALL the firetruck!
Here's the switchhope this helps!