On Fri, 2 Apr 2010 12:47:15 -0400, Paul Christensen wrote:
>ere are my conclusions, not that they're correct by any means:
>1) Use of "all three modes of protection" using MOVs is fine at the service
>entrance panel or utility meter. There's little risk of independent
>potential rise on any conductor as the result of a diverted surge from a
>2) Avoid "all three modes of protection" MOV devices anywhere on a branch
>circuit, despite recommendations by Standler, Martzloff, and Gauper; and
>3) If a branch circuit MOV device is used, use a series-mode device between
>line and neutral whereby the surge potential is stored and slowly dissipated
>through the neutral conductor. These are expensive devices but I suppose
>that's relative only to the amount of potential damage caused to equipment
>by using incorrect surge suppression devices for the job -- or no surge
>suppression at all.
I strongly concur. Indeed, I would only add that #1 is highly desirable.
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