Answer Posted / naeem
Acceptable IR value for HT cable with Megger at 5KV is 1000Mohm and for LT cable with Megger at 500V is 2Mohm and If the obtained value is less than these then cable may be suspected, we can energise the cable even with low values and it will stand but with full load in high temperature any time cable can create problem , so the standard is 1000Mohm for HT and 2Mohm for LT cable.
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