Re: 48V.
"PS. Being shocked by the 90v 20Hz Ringing voltage is hilarious because it feels exactly like the old fashioned ringer bells sound."
Yes, although I seem to remember the hilarity mostly comes from connecting some other poor sod's pliers to it when they're not looking, or tipping the wink to a switchboard operator when your mate is at just the right part of changing out a faulty cord..
The booster voltage on x-bar switches (200v for select and 150v for hold, IIRC) was also something worth keeping away from as well.
Biting the hand that feeds IT
