Quote:
Originally Posted by Digging4Truth
Will do bro. We want this to be a long term system and a driven ground is a small price to pay to ensure a stable voltage.
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I would suggest 2 or even 3 (rods)....and if it may be there for years....3/4" copper clad rather than 5/8 galvanized (supply houses almost always carry both).
You will need the basic clamps and grounding electrode CONDUCTOR...to interconnect the grounding system (without splicing).
Depending on the size of your secondary service conductors.....will set your grounding electrode conductor....
See table 250-66 in NEC (2008) --table no. may be different if you are referencing an earlier NEC version.
The softer the soil, the poorer the ground. A rod that takes a bit of a work-out to drive is best (soil is tight but has moisture).
The reasons I suggest multiple rods is because for your PRIMARY grounding system we want to achieve the lowest grounding resistance within a reasonable effort. Rods should always be installed with a MINIMUM SPACING of six feet.
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ON THE OUTSIDE chance this installation involves the pouring of a concrete pad, a UFER Ground system can be used in lieu of the driven electrodes. This is an excellent approach if the soil is rocky or very dry (moisture is key to ground conductivity)