What’s that green thing and other items of interest……

Recently a reader sent in the photo above with a question about the green and black device with the wires coming out of it. Simple question, what is that thing? While looking at the photo, I couldn’t help but notice one of the things I posted about last month regarding chafe protection for wiring. Well, the green thing is some sort of current transformer, or in electro-speak a “CT” coil. These devices are typically used today to measure the electrical current (amps) in the conductor and ...