8 Feb
2015
8 Feb
'15
10:05 p.m.
On Sun, 8 Feb 2015 15:52:43 -0500, Gene Heskett wrote:
On Sunday, February 08, 2015 03:23:44 PM Ralf Mardorf
wrote:
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:
On Sun, 08 Feb 2015 21:14:12 +0100, Hermann Meyer
wrote:
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. 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. ANY time I go into that sort of a situation where there
are unknowns,
That's the problem, there are always "unknowns".