I’m looking to buy a pair of IotaWatts and some CT’s for my panel. I’ve got 7 240V circuits, and 15 120V circuits.
My big problem is getting something on the mains. It’s really tight - mainly because there is a pair of doughnut CT’s already there, from a system installed back in the 90’s. I’ve got no idea of the specs on them, but they’re obviously current-mode (burden resistors are on the 90’s electronics) and likely totally unprotected. Removing them requires disconnecting wires that I’m uncomfortable handling live, or calling the utility to have them pull the meter so I can disconnect / reconnect safely.
The question is, what’s the likelihood that I could reuse these CT’s? I can measure the voltage across the existing burden resistor to get an idea of whether they’re in the right range, but turns, phase, etc. aren’t likely to be easily determined. Any thoughts?