Grounding Profile - How far outside the fence should we go
Grounding Profile - How far outside the fence should we go
(OP)
How far outside the fence should one go modeling their substation grounding profile?
Is 5ft safe enough to view the step and touch potentials?
Is 5ft safe enough to view the step and touch potentials?






RE: Grounding Profile - How far outside the fence should we go
RE: Grounding Profile - How far outside the fence should we go
My concern was mostly in regards to the step potential.
Judging from your questions as well it seems like in most of our modeling we pay alot more attention to touch and how far one can go and still touch the fence or gate etc, but what happens to step when the surface rock layer is no longer there i.e. when one is standing on the natural soil after the surface rock ends?
RE: Grounding Profile - How far outside the fence should we go
RE: Grounding Profile - How far outside the fence should we go
Is there a quick way of calculating the actual step potential however many ft outside the fence?
I am using the following equation for my step voltage threshold calculations
Estep50 =(1000 + 6Cs x ρs)0.116 ⁄ ts
where Cs = Surface Layer derating factor
ρs = surface layer resistivity
ts = shock duration
RE: Grounding Profile - How far outside the fence should we go
In the case of no crushed rock surfacing, Cs = 1 and ρs = ρ, the resistivity of the earth.