Admin Disclaimer (@JustinAtSense): This is a potential fire hazard and not an advised solution for 240V device monitoring. Dedicated Circuit Monitoring is a better solution, allowing you to monitor up to 2 120V or 240V devices.
I did it! I used this junction box, to splice a HS110, into a 12/2 wire + this conduit tubing + this male/female plug set for a 240V AC, a 120V pool pump, and a 120V pool booster bump. I replaced all the 20A breakers with 15A breakers.
For the 120V circuits I also used these short plugs.
Works like a charm!
