I have to install a static ground indicator for a railcar solvent unloading station. The indicator has an intrinsically safe circuit in it. I have read that I.S circuits need very low ground resistance to work properly. I have heard of a product that is put around the ground rod or grounding system to help lower the resistance to ground. Also has anyone used the clamp on resistance testers from AEMC? I am resposible for the grounding system of a large chemical plant were grounding is VERY important. Would this instrument be wise investment or are there other testers that would be a better choice?
