How the Vue Measures Electricity
Nothing is cut, nothing is rewired, nothing is estimated
The Vue measures your electricity the way a clamp meter does — by sensing the magnetic field around a conductor it never touches — and then does it continuously, on every phase.
The clamp, and why it never touches the conductor
A current transformer is a split ring of magnetic material with a coil wound around it. Clip it around a live conductor and the alternating current inside creates a changing magnetic field; that field induces a small, precisely proportional current in the coil. Nothing is spliced, nothing is interrupted, and the sensor is electrically isolated from the circuit it measures.
Each sensor must see one wire, and only live wires. Pass two phases through one clamp and their fields partially cancel — the reading comes out badly understated. Clamp a neutral and you measure return current, not consumption.
Two sizes are supplied: 200 A main sensors (22 mm aperture) for the incoming phase conductors, and 50 A branch sensors (10 mm aperture) for individual circuits.
The harness, and why current alone tells you nothing
Current is only half of power. To turn amperes into watts the monitor also needs voltage — and the phase relationship between the two. That is what the four-wire harness is for: it powers the monitor and simultaneously gives it a live voltage reference on all three phases and neutral.
This is why the Vue cannot run from a wall socket. It has to sit in the board, referenced to the same supply it is measuring.
What “three phases” means for your readings
On an Indian LT connection you have three phases and a neutral — 415 V between any two phases, 240 V between any phase and neutral. The Vue measures each phase independently rather than averaging them. That matters because loads are rarely spread evenly: a house or factory that grew over time usually has one phase carrying noticeably more than the others. You cannot correct an imbalance you cannot see.
Mains, branches, and the Balance figure
The three main sensors measure everything coming in. The branch sensors measure specific circuits. Whatever the mains recorded that the branches did not account for appears as Balance — everything you chose not to monitor individually.
A persistently negative Balance is a fault signal: branch readings exceeding the mains reading usually means a main sensor is misplaced.
What the Vue is not
It is not a billing instrument. It does not replace your utility meter, it holds no BIS certification, and its readings have no legal standing with a DISCOM. It does not work without internet — data is processed in Emporia's cloud.