When Sense is reporting a new device, it would useful to know if it is a 240V or 120V device.
It would also possibly be useful knowing what phase of the 120V the device is powered from (less important).
I think you know this, since you are monitoring the mains feed and should be able to tell if one, the other, or both have a common current.
Just a thought.
Sorry for spamming this, but I just noticed there is already a product suggestion for the same idea. Great minds and all that…