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I have two Vue2 units with 16 CTs each and two 200amp mains with 4 breakers in one panel and 22 breakers in another. I have a GeoThermal HVAC system and have been curious how much the backup plenum heating elements are used. From diagrams I can seen the three 240v circuits used are not balanced due to motor circuits used across single legs of the 3 240v breakers, thus have placed 6 CTs across the three breakers associated with this system. On the other panel 240v breakers I’ve also placed dual CTs since a dryer also uses a 120v motor thus only on one leg, another 100amp 240v breaker is also using dual CTs since it feeds another 100amp subpanel in another portion of the home which was an old fuse panel updated to circuit breakers which is not individually monitored yet, but most subpanels are not balanced. To monitors the 22 breakers on one panel I borrowed 9 CTs off of the lightly loaded second Vue2. The 9 CT wires are passed between the adjoining Main panels via a short 1.5inch diameter conduit I placed between the bottom of the two main panels. I am waiting for a future release of the app where I can logically assign the 9 borrowed CTs to the proper Vue2 so as to correctly balance the sub CTs with the mains. Till then it’s a bit of a game, but manageable.
My background is as a SCADA Systems Electronics Engineer/Programmer for WAPA’s Upper Great Plains operating area, where we are responsible for bulk power transmission and generation management for 6 state region. Thus have practical experience in the area as well as educational backgrounds in engineering physics, electrical engineering and computer science degrees.
