Grounding rod spacing
Grounding rod spacing
(OP)
Hi,
If designing grounding for a new fabrication facility that is 500’W x 1000’L and that it is intended to have a perimeter ground grid, plus we plan on installing 10’L ground rods periodically, what's the appropriate spacing for those rods?
NEC 250.53 (B) requires a minimum of 6-ft between electrodes (for multiple rods situation), but no maximum spacing requirement. The article below suggests 2X of rod length (e.g., ~20 feet spacing for 10 feet L rod). However, it still results in way too many rods for an industrial facility in that size. Is it required to install them in this manner or is there any variance? Suggestions?
http://www.esgroundingsolutions.com/i-am-going-to-...
Thanks,
JS
If designing grounding for a new fabrication facility that is 500’W x 1000’L and that it is intended to have a perimeter ground grid, plus we plan on installing 10’L ground rods periodically, what's the appropriate spacing for those rods?
NEC 250.53 (B) requires a minimum of 6-ft between electrodes (for multiple rods situation), but no maximum spacing requirement. The article below suggests 2X of rod length (e.g., ~20 feet spacing for 10 feet L rod). However, it still results in way too many rods for an industrial facility in that size. Is it required to install them in this manner or is there any variance? Suggestions?
http://www.esgroundingsolutions.com/i-am-going-to-...
Thanks,
JS






RE: Grounding rod spacing
You will start by calculating the touch and step permissible potentials and so will get the minimum number of vertical electrodes combined with the horizontal grounding wire length.
By the way, I think cuky2000 has an Excel program following the IEEE 80.
RE: Grounding rod spacing
RE: Grounding rod spacing
RE: Grounding rod spacing
RE: Grounding rod spacing
Hope this help.
RE: Grounding rod spacing
RE: Grounding rod spacing
Many building floor slab use plastic vapor barrier that isolate the floor from ground as shown in the picture below. In this case the grounding requirement need to be addressed properly.