[Scoundreller]

These clamp on systems may not work too well on North American 240V circuits like a dryer since the emf will cancel, no? You have two 120V feeds exactly 180 degrees out of phase with eachother. Unless you unravel the wires a bit and just clamp a single conductor.

Or maybe I have this all wrong.

[jtriangle]

You are correct, current clamps can't read accurately in this situation. All you'll get is any disparity between the phases, which, will be small.

That said, it's probably worth a try, because it's likely that internally the drier's control circuits are only tapping one leg, and you might be able to read that, and it might change reliably enough to trigger an alert.

Usually, you'd use a vibration sensor for this job however. You can also use a thermal sensor on the exhaust air, combined with a time delay (because they run cooldown/dewrinkle cycles), and you're good to go.

[pavel_lishin]

Huh, I thought 240V circuits used some sort of three-phase system.