> Original Poster: "jim lux" <jimlux-at-jpl.nasa.gov> > > > -----Original Message----- > From: Tesla List <tesla-at-pupman-dot-com> > To: tesla-at-pupman-dot-com <tesla-at-pupman-dot-com> > Date: Friday, March 19, 1999 10:23 AM > Subject: Mains Current Monitoring > <snip> > That is exactly what a current transformer is.... You'll need to select an > appropriate toroid core material (i.e. ferrite won't do). Why? Malcolm <snip>