If I could make a humble recommendation, next time maybe only ground one end of the shield (I’d suggest the controller end). If both ends are “grounded,” any difference in potential in the grounds at each end (which is more or less inevitable over long distances) will cause current flow in the shield and current flow in a wire creates a magnetic field and any change in a magnetic field induces voltages in the conductors the magnetic field pass across (Faraday’s law) and . . . can cause interference.I concur with Ben's comment above.
Recently, I had to install 300 feet of cable connecting a Hunter flowmeter to the Hunter controller. Because of site constraints, I had no choice but to install the cable in the same trench as a cable controlling the master valve and several other zone valves. For 30 feet under a roadway, the cables shared the same 1 inch conduit.
I used a special shielded cable for the flowmeter cable, and made sure the shield was grounded at both ends. It has worked flawlessly.
The special cable cost more, but it would have cost me a heck of a lot more if I had used regular cable for the flowmeter and it didn't work reliably due to interference.
...I jumped the fenceGlad to see they released you
Never tried Rachio but I've noticed you kinda have a crush on them. My son-in-law installed one at their house and I sorta looked at the app. The hardware really turned me off though, maybe they've improved it?...I jumped the fence
Perhaps unsolicited and uninteresting, but:
Have you ever tried a rachio gen 3 and rachio wireless flow meter pair? Its got its limitations for certain, but it certainly is neat in the right application Just a somewhat related sidenote that is somewhat unrelated.
(Otherwise glad you asked this question i wasnt aware of interference sheilding wire insulation.)