Ground Grid - Indoor installation
Ground Grid - Indoor installation
(OP)
I was recently reviewing a ground grid study for an indoor installation and saw something that struck me as odd. The ground grid is installed beneath the basement, air cured, concrete floor of a building. There is steel re-bar inside the concrete slab. Yet the study still lists the resistance of the slab as 10,000 ohm-meters. This seems high to me.
Has anyone had previous experience with this type of installation that could verify whether this is or isn't a plausible resistance value for air cured concrete with re-bar?
References to technical documents would be much appreciated. I have already looked through the office copies of IEEE 80, IEEE 81, IEEE 665 and the IEEE Green Book. I so far haven't been able to locate anything indicating the resistance of air cured concrete for indoor installations.
Has anyone had previous experience with this type of installation that could verify whether this is or isn't a plausible resistance value for air cured concrete with re-bar?
References to technical documents would be much appreciated. I have already looked through the office copies of IEEE 80, IEEE 81, IEEE 665 and the IEEE Green Book. I so far haven't been able to locate anything indicating the resistance of air cured concrete for indoor installations.






RE: Ground Grid - Indoor installation
http://www.claisse.info/2010%20papers/m19.pdf
Usually under the concrete floor, it is an isolation layer –polyethylene or rubber
of 2-5 mm thick and this layer of high resistivity could influence the resistance measurement.
RE: Ground Grid - Indoor installation
Just for my own curiosity, why there is a copper ground grid under the steel re-bar concrete basement at the first place?
What type of electrical installation do you have?
RE: Ground Grid - Indoor installation