Hi there,
And Happy Turkey Day to you and Yours..
So, that is the device that is used, The “CT” as it’s known.. Will do exactly that , Sense the amount of Current flowing in the Wire… Many home automation systems use them, “emporia” is one I have installed and it worked very well using many pairs of the CT’s of differing sizes. Each gets connected to a input of the system and logs the events.
Just like the Grove “EMG” with the 3.5" jack Pad inputs & I2C output.
Those should work easily.
GL 
PJ 