The resistance of the protective grounding wire in the DCS is high
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The protective grounding resistance of our company’s DCS is 167 ohms; the branch wires in the rack are functioning normally, so I’m not sure what the cause is
So big? Standard is 4 ohms; conduct a segmented inspection by checking the electrical grounding resistance, the diameter of the grounding cables, and the contact at the connection points
1. You are using a ground resistance tester, not a multimeter. 2. Is such a high ground resistance normal for the main busbars and branch busbars? It can only be said that the status is separately grounded. 3. There is a problem with the overall grounding; check where exactly the grounding terminal is connected……
The protection value should not exceed 4 ohms, right?
Currently, the standard practice is to use a common grounding electrode, with a resistance value of no less than 1 ohm. It is necessary to check step by step, from the main grounding bar to the individual grounding bars: lol
The wiring on the panel is normal; I’m not sure what this means I don’t understand.