I suppose we have a different notion of shielding. If you look at this page, you'll see the shielding effectiveness dropping with frequency, hence the skin dep

I suppose we have a different notion of shielding. If you look at this page, you'll see the shielding effectiveness dropping with frequency, hence the skin depth. http://www.ets-lindgren.com/iSeries-71 http://www.ets-lindgren.com/iSeries-71