I don't know if this has been covered in other threads (I couldn't find it). Domestic site, owner has 4 channel aux Input unit 3 kilowatt meters din mounted ( with a set of static outputs on each meter). I am hoping I can use the static outputs of one meter as an input on the aux unit for phase number 1, use the static outputs the second meter as an input on the aux unit for phase number 2, use the static outputs the third meter as an input on the aux unit for phase number 3. All things being equal, collect the usage on all three meters, collect a total and display on screen via Piced. This will show total usage at the site. Question: how do I tell wiser that it is 3 phase supply I am monitoring, and not 3 circuits of power. Do I add the 3 and divide by 3 for an average? Surely not. All advice welcomed. Regards Brad:)