> MOV's should never tie to the safety ground lead or any ground lead
> outside of an entrance panel.
That makes a lot of sense. Some of the sources I've read recently advocate
not using ground as a MOV reference for that very reason. High current
surges may follow other grounding paths (coaxial cables, audio shields,
etc). But there are sure a lot of commercial MOV devices that offer "all
three modes of protection" with a ground connection.
Several manufacturers divert to a neutral when available, rather than ground
to avoid the above problem, presumably to route the energy to ground at the
neutral/ground common tie point at the service entrance. Probably my best
alternative above and beyond the "whole house" device is to use a single MOV
across the 240VAC line and skip the MOVs from line to ground.
Paul, W9AC
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