I installed Flex Add On Sensor in my electrical panel on an AC device shut down for the season (should not read anything). Strangly enough, I was reading current on this dedicated circuit. After investigation, I found that I was picking up partially neighbour breaker current!
The reason seems to be that the neighbour circuit cable was too close (in contact) to Flex Add On. After pushing away the neighbour circuit breaker cable, my dedicated Flex circuit did not measure anything any more.
Bottom line, be caution that the Flex Add On Sensors could pick up electromagnetic fields from in contact cables located outside its loop.
Initial set up catching electromagnetic signal of neighbour cable:
Close up of initial setup catching electromagnetic signal of neighbour cable:
New set up with no cable toutching Flex Add On Sensor preventing it from measuring neighbour signal:
Could Sense experts tell if outside loop cables are detected by sensor per design?