Why 5 ohms ground resistance?

[tom baker]

I have a new water pumping station that specified 5 ohms ground resistance for the grounding system, with a ground ring, ground rods, and a Lyncote chemical ground rod, and a ufer ground.

The

 

[ron]

Re: Why 5 ohms ground resistance?

Is there a significant amount of electronic controls?
Maybe a leftover from a Data Center Specification?

 

[dereckbc]

Re: Why 5 ohms ground resistance?

Ok if it is specified and using all the electrodes you listed, there should not be much of a problem achieving 5 ohms. Sounds like a telephone office spec to me, at least those are methods I have used to get 5 or less. Did you mean Lyncole?

[ January 14, 2004, 04:06 PM: Message edited by: dereckbc ]