Answer / vinoth

IR means Insulation Resistance. basically IR value need is ( Rated KV+1 ) Mohm.
For eg if motor rated voltage is 11Kv then we need IR value has 12Mohm.

Minimum 1Mohm is sufficient to start LT motors.

For HT Motor- ( Rated KV +1)Mohm

it is very suffient to start motors

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