Service Mains too big to put clamps on

[kevin1]

If you truly have “a 208V” system, your townhouse is fed by 2 phases (and neutral) of a 3 phase supply which is typical for larger buildings, This is different than the typical residential split phase supply. Sense can work on a 2 of 3 phases supply, but you do need to be aware of differences.

Sense voltage readings

And not to complicate issues BUT: Not all supply voltages are 120V + 120V = 240V As @kevin1’s reference points out, 240V is available because the voltage phases are at 180 degrees. Like many urban panels, my supply is coming from 3 phases, of which my panel has 2! So in my case I have 120V + 120V = 208V! Sense auto-magically accounts for this although strictly speaking I imagine the phase-related disaggregation algorithm at the DSP is less happy due to the smaller dataset of 2-of-3-phase us…

ps: I’m wondering where both the conduits that contain mains thick black white and red wires go. One probably goes to the meter. The other ….