March 20,
Hello all. Sorry for my absense. We never have recieved any reply from the Grounding equipment manufacturer and so have proceded as I described above. We ultimately agreed upon some 24 rods and a 3/0 copper ring. To clarify, the building is a corprate headqaurters building with Lab...
March 7-
Hello all. I appologize for my neglect of this thread, but have been out of town for a few days. Here is where the project stands:
I performed a calculation based on the formula in ieee green book for a single rod and obtained a worst case value of 20.5 ohms. Utilizing the table data...
I concur with the maintenance of the rods. At this point I've performed some calcs which indicate that in the worst of the soils (6874 ohms/cm), the average 5/8" rod that can be burried to depth vertically should yield ohms in moderately moist earth. That figre comes to 20.25 ohms. Per...
Forst of all: Thanks so much for your interest and replies.
The building is a corporate headquarters. It has one complete floor dedicated to a testing lab. It also has a small data floor (2000 sf.).
My spec has evolved from Telcom, Data Center and pharmaceutiacl campuses. Of course the Telco...
I have a building that I designed the Elctrical Distribution system for, under constructon. I designed my standard ground ring utilizing #4/0 copper, with 5/8" x 10' ground rods spaced 20' OC. qround the building. As I was never privy to a soils report, and as most of the soil is sandy...
I have abuilding under constrcution. I designed my standard ground ring utilizing #4/o copper with 5/8" x 10' ground rods spaced 20' OC. qround the building. AS I was never privy to a ssoils report, and as most of the soil is sandy loam in this area I wrote a performance specification...
