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Shorted MOVs.....

I've seen "live chassis" conditions occur a few times. I had one of these so-called "surge protectors" short an MOV, and it happened to be between the hot wire and safety ground. (It also had MOVs between hot and neutral and between neutral and safety ground, which were still fine. Although in retrospect, I don't see the point in tying MOVs to safety ground if there are others tied to neutral.) The breaker tripped without the MOV blowing open (it read dead short across an ohmmeter). The chassis may have become "live" had the safety ground been physically separated from neutral at the breaker box.

MOVs shorting out are not that rare. This is a common cause of ground faults.


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  • Shorted MOVs..... - Todd Krieger 22:11:28 04/05/07 (0)


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