On Sun, 8 Feb 2015 15:52:43 -0500, Gene Heskett wrote: >On Sunday, February 08, 2015 03:23:44 PM Ralf Mardorf wrote: >> On Sun, 08 Feb 2015 21:14:12 +0100, Hermann Meyer wrote: >> >Old buildings didn't use grounds, they just have 2 cords and use the >> >second as ground and backline. In German this is called Nullung. >> >Potential issues are clear with this technique. >> >> Actually I'm living in an "Altbau" with retrofitted concrete-footing >> ground electrode. Potential issues could be caused by tons or >> grotesque reasons. Reality has absolutely nothing to do with school >> books. > >A ground into concrete is not much of a ground at all. On this side >of the small pomd, we are required to drill thru the concrete if its >in the way, amd sink 2, 8' copper rods directly into the dirt below >the concrete, spaced not less than 8 feet apart. And they are >mandated to be connected to both the neutral and the static grounds AT >THE ENTRANCE SERVICE AND NO WHERE ELSE. The German term is "Fundamenterder" and it comes with a "Potentialausgleichsschiene". We have a DIN norm for protective earth neutral Fundamenterder with Potentialausgleichsschiene. The translation to "concrete-footing ground electrode" isn't perfect. On Sun, 8 Feb 2015 15:32:02 -0500, Gene Heskett wrote: >ANY time I go into that sort of a situation where there are unknowns, That's the problem, there are always "unknowns". _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/listinfo/linux-audio-user
