Where did you get that idea from? If it’s written anywhere on this site, I will get it changed, because it is incorrect. Currents are not normally displayed, only the three powers are normally sent to emonCMS, and those ARE available separately. But if you specifically want to see the phase currents, then you can modify the emonTx sketch to send those as well as the three powers, and record and display them as you need. Normally, we display only power, because that is what most people are charged for by their supplier.
Again. that’s not quite true. When setting up the emonTx, you will be able to do at least part of the set-up and calibration in your “den”. For that, you will need a programmer (or a serial connection, but a programmer and a laptop is by far easier), and only the last stages of commissioning need to be done at the incoming cables.
What I think you will have, from what you have written, is:
At the switchboard where your incoming cables are: 3 c.t’s, one a.c. adapter, possibly one 5 V. d.c. USB adapter, and the emonTx. That will send the data by 433 MHz ISM band radio (not Wi-Fi) to
in your den, the RPi + RFM69Pi adapter (the emonBase).
In your other rooms, each has a temperature sensor sending data by Wi-Fi to the emonBase.
Somewhere else, a smartphone, tablet or computer on which you see the web pages generated by emonCMS, showing your power, temperatures, etc.
The reason for saying you might need a 5 V d.c. power supply to the emonTx is, if the a.c. voltage falls to far, it will stop working a reset itself when the voltage rises again, even though the interruption might only last for a fraction of a second.