Donovan says: > Hello, > > I'm up here in Canada and indeed we have single-phase. Was thinking 3 phase > because of the 3 wires - brain fart. Anyway, to measure the current can I > put the "clamp on" device in series with any wire? The "clamp on" types don't actually have "live" current going thru them. They inductively measure the amount of current flowing thru the wire. It does this by measuring the magnetic field around the conductor. http://www.appatech.com/a-30.htm <--- A picture is worth a thousand words michael brown -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.