Instrument grounding issue
Thread Content
What is the difference between the grounding connection resistance of the instrumentation system and the grounding resistance of the instrumentation system?
Hehe, let me talk about something that everyone doesn’t want to discuss. The grounding connection resistance of an instrumentation system refers to the resistance between the grounding terminal and the grounding electrode; this value should not exceed 1 ohm (it mainly relates to the resistance of the wires, as well as the resistance that occurs when there is poor contact between the terminal and the grounding wire). The grounding resistance of an instrumentation system essentially refers to the resistance from the grounding electrode to the ground, and it is supposed to be less than 4 ohms. Now, the equipotential grounding should be no more than 1 ohm.
I’ve learned it, thanks! I would like to learn more about the inspection methods and measures.