Ah....Touch Buttons and Balanced Bridge detectors...The good old days..
One of my first few days on the job, 35 years ago, my boss tells me..
"That tenite cover is loose over the door detector. Reach in behind it and tighten it up"..
Let's just say that 1000 cycle wouldn't kill you but it would make you hurt yourself trying to get away from you..
Of course he thought it was hilarious. Different times for sure..