> > "Ground fault" > > circuit breakers check for current in the ground line and trip if more > > than a few mA are found. > > Actually, "ground fault" circuit breakers are designed to detect any current > flowing from the hot that does not return on the neutral. They use a > differential sensor to do this (counterwound coils, IIRC). This causes them > to trip when current runs thru either a fault in a device insulation or an > external path (like you) to ground. Yes, you are absolutely right. I noticed that my statement was a bit misleading right after I sent it and wondered if some wiseass would bother point it out . ***************************************************************** Embed Inc, embedded system specialists in Littleton Massachusetts (978) 742-9014, http://www.embedinc.com -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email listserv@mitvma.mit.edu with SET PICList DIGEST in the body