So our clocks run at the right time and our lightbulbs don't explode ??? :=) Peter -----Original Message----- From: richard dellacona To: PICLIST@MITVMA.MIT.EDU Date: Wednesday, January 28, 1998 10:04 AM Subject: off topic >hello out there does any one out there know why 60 cps and 120 vac >is used in usa for line voltage no one seems to know or have a good >answer for this question >