skeshesh
Senior Member
- Location
- Los Angeles, Ca
Good day everyone.
I can't find a good reference for this. The NEC does not seem to have anything specific on the subject. I'm looking over a job a co-worker did before retiring and he's specifying 1"PVC with #2AWG being dragged from post to post and connected to a ground Rod. I'm not sure why he did not just use a bare conductor in that case to establish a ground ring and avoid using a ground rod, but that's not the issue.
The details show a typical Burndy post ground clamp connector with a 2/0AWG. I've often seen 1/0 or 2/0 specified for connecting the posts but have not done any calculations. The fence is not electrified and has no electrical provisions (access control, etc.). I looked up the calculations for determining the KCMIL for the ground but the simplified version requires short circuit levels and time of fault which I don't have and the longer formula requires additional information (resistivities at different temps, etc).
The guys installing this are questioning the size of the grounding conductor and I want to have a solid understanding of what's going on before I give them an answer. Any comments or referenced would be much appreciated.
I can't find a good reference for this. The NEC does not seem to have anything specific on the subject. I'm looking over a job a co-worker did before retiring and he's specifying 1"PVC with #2AWG being dragged from post to post and connected to a ground Rod. I'm not sure why he did not just use a bare conductor in that case to establish a ground ring and avoid using a ground rod, but that's not the issue.
The details show a typical Burndy post ground clamp connector with a 2/0AWG. I've often seen 1/0 or 2/0 specified for connecting the posts but have not done any calculations. The fence is not electrified and has no electrical provisions (access control, etc.). I looked up the calculations for determining the KCMIL for the ground but the simplified version requires short circuit levels and time of fault which I don't have and the longer formula requires additional information (resistivities at different temps, etc).
The guys installing this are questioning the size of the grounding conductor and I want to have a solid understanding of what's going on before I give them an answer. Any comments or referenced would be much appreciated.