i am an maintenance engineer. one distribution board have 5
feeder. recently its ELR trips frequently, but it take some
times after trip( 10min,20min..)but 3 feeder no load. two
feeder only loaded. i checked one feeder IR value all values
are above 50Mohm.but B phase to Earth is only 9Mohm.any
problem about low value
Answer / Trapti Kansal
The low earth resistance (ER) value of 9 Mohm for a distribution board feeder could be a cause for concern, as it might indicate a fault or issue with the wiring or grounding system. However, without more information on the specific equipment and operating conditions, it is difficult to determine the exact problem. It is recommended to consult with an electrical engineer or a technical expert for further analysis.
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