Resistivity Test
Resistivity Test
(OP)
A contractor submitted a test proposal and added a small note:
"Please see that if GPR as well as the step and touch potentials cannot be achieved as required, additional on-site testing will be required and the possibility of having
a remote ground grid may have to be considered,".
I am just wondering that remoted grid will only help in reducing GPR but not in step and touch potential. Is this correct ?
Thanks
"Please see that if GPR as well as the step and touch potentials cannot be achieved as required, additional on-site testing will be required and the possibility of having
a remote ground grid may have to be considered,".
I am just wondering that remoted grid will only help in reducing GPR but not in step and touch potential. Is this correct ?
Thanks






RE: Resistivity Test
RE: Resistivity Test
So, Earlier if one grid had Rg1= 5 ohm and now Rg2 the remote grid is also 5 ohms, the net resistance will be 2.5 ohms. So if on a conservative basis, if my fault current is 100 A, the GPR will be 250 V instead of 500 V.
So touch and step potential will be effected in the same lines as GPR.
I hope I got it right ?
Regards,
RE: Resistivity Test
Also see thread238-189113: Interconnected Grounding System