I'm doing a project to monitor and control 5 separate air conditioner units in my house.
The AC Units run in 240V power (two 120V phases), each unit has its own breaker in the box.
I'm using five current transformers, as outlined here: http://openenergymonitor.org/emon/buildingblocks/ct-sensors-interface to detect the current flowing to the AC (<0.01 = off, between 0.03 and 0.8A just the fan, and 2A and up means full compressor running).
Everything mostly work, the only issue I have is that when I turn on a unit I get a current spike in another unit for a while, and that throw off my logs. I can confirm this reading with my clamp shell ammeter
I think this is because the cables are inducing current on each other (they all go through the same conduit).
Is there anything that I can do on the electrical side to get rid of this effect?