Ground ring installation
Ground ring installation
(OP)
The engineer who designed the electrical system for a new facility we'really building had new grounding ring connected to near by building ground grid. Is there any code requirement for this? Can we just have that connected to a different grounding source such as a column? I do not see anything wrong since all columns are bonded to the grid anyway, unless there is a code or standard requiremwnt. Let me know what you guys think.






RE: Ground ring installation
Regards
Marmite
RE: Ground ring installation
So any means to reduce the grounding resistance has to be exploited.
The foundation grounding create a safety cage in order to mitigate the touch voltage and to protect sensible electronics against transient voltages.
The IEEE 142 standard ch.4.2 Ground electrodes 4.2.3 Concrete encased electrodes recommends this foundation grounding type.
NEC art.250.52 Grounding Electrodes.(A) Electrodes Permitted for Grounding. (4) Ground Ring.
“ A ground ring encircling the building or structure, in direct contact with the earth, consisting of at least 6.0 m (20 ft.) of bare copper conductor not smaller than 2 AWG.”
If the foundation grounding was not correct executed-or there is any doubt about this-a grounding grid is a required solution.
RE: Ground ring installation
RE: Ground ring installation
Does the same party own both buildings?
Bill
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"Why not the best?"
Jimmy Carter
RE: Ground ring installation
RE: Ground ring installation
RE: Ground ring installation
From the technical point of view a reinforced concrete column is comparable with a ground rod. See the figure below.