A question for our resident electrical gurus:


I've been running a 3 HP VFD on my TS for ten years now, with no problems. However I was just reading the docs on a new Fuji unit I'm considering for my planer, and it says that for "CSA" compliance, one must install transient suppression on the supply side. I've never had this, and am wondering how important it is, since such devices aren't cheap. (The unit I have was expensive, so might have built-in protection.)

Are VFD's very prone to spike damage? (With most electronics, it's no spikes but brown-outs that kill them.)

Would it be enough to put a couple of big corcom filters on the service entrance?

Also, This particular drive has an optional "line reactor." available, for $160. Am I correct that this is some type of spike protector?