Junior Member
Posted May 12, 2017
How do you figure out the distance required for a 3-point fall of potential test? I've heard you should drive your C2 anywhere from 3 to 10X the diagonal of the grid but I've seen other literature that give tables showing different values based on different distances.
To keep things simple, let's say we had a building that was 100' x 200', how far out would you take your leads?
This slide shows 10X diagonal.
This slide shows non-linear percentages.
Junior Member
Posted August 9, 2018
Originally Posted by marvinray
How do you figure out the distance required for a 3-point fall of potential test? I've heard you should drive your C2 anywhere from 3 to 10X the diagonal of the grid but I've seen other literature that give tables showing different values based on different distances.
To keep things simple, let's say we had a building that was 100' x 200', how far out would you take your leads?
This slide shows 10X diagonal.
This slide shows non-linear percentages.
Extract of IEEE Std 81.2-1991
it states to use 6.5 times the substation diagonal length/distance
