Here is the latest entry to the recap given above in March, which provided a timeline of what happened between April 2023, when I started the thread, and March 2024.
June 2024
emonTx5 was introduced to the OEM Shop. A new “N. American split-phase” option for the EmonVs was introduced to both the emonTx5 and the emonPi2 ordering options. This option provides the components for the “technical user” configuration discussed above: an emonVs with 2 input channels and firmware for monitoring both legs of North American split-phase power. Here is the announcement topic.
emonTx5 transmitter node & emonPi2 (12 CT expansion) available in the shop - Hardware - OpenEnergyMonitor Community
In that announcement topic @Bill.Thomson pointed out that we still may not have solved the question of what a safe, up-to-code installation will look like for this split-phase monitoring.
The National Electrical Code (NEC 725.136A) specifically excludes any low voltage wiring from being installed in an electric panel, raceway, or box used for high voltage (120/240V) circuits.
Low voltage in this context, means less than 50 Volts.
I suggested in that topic the shop could offer a “non-technical” configuration like the one we discussed in this topic, and @TrystanLea said he would discuss it with @Gwil.
I would like to further discuss here the safe, code-compliant installation of a split-phase-monitoring emonVs.
My next thought would be to run a length of Romex (residential branch wiring) from a 2-pole breaker, out of the electric panel, and into the emonVs, so that the emonVs would be outside the electric panel but have each input connected to a leg inside the panel.