Excellent, informative post, John. Though I didn't understand most of the technical stuff, I believe I got the gist of what you had to say, which was that though the Brickwalls provide good protection, so do most of the better MOV based protectors, particularly when encountering the more typical, real world surges. Did I get that right?

Jack

"People generally quarrel because they cannot argue." - G. K. Chesterton