The monitor The monitor is essentially a computer. The four inputs along the top are: Power, Voltage, Current, and an Ethernet connection.

Flexible Current Transformers These are the Current Transformers (CTs). These are used to measure the amount of AC current traveling through a conductor by wrapping them around it.

Installed CTs Red: Flexible CT Green: Hard CT The CTs are each wrapped around one wire. One is around the Brown, one around the Orange, and one around the Yellow (the 3 phases). There is a hard CT around the ground (green) conductor

Connection of the Voltage Leads Red: Phase Connection Green: Ground There are 4 voltage leads in this picture. One is connected to each phase, and the other is connected to ground.

The Monitor Inside an Air Conditioner Unit The monitor is circled in red. The transformer leads are the red wires indicated by the red arrows. You can see the monitor in the back to the right. The voltage at this point was 480V, so in order to power my monitor I had to step that down to 120V using a transformer. The leads to the transformer can be seen in this picture

The whole picture Laptop Ethernet cable My tool bag CTs Power disconnect and fuse box Monitor bag Laptop bag I am downloading the monitor in this picture. You can see my laptop on top, and a white wire going down to the monitor.