What is the recommended minimum insulation-resistance value for an acceptance test on random-wound stator coils and form-wound coils below 1 kV?

The recommended minimum insulation-resistance value for acceptance testing of random-wound stator coils and form-wound coils below 1 kV is 5 Megohms. This value is significant because it ensures that the insulation in these coils is functioning properly and that there are no weaknesses that could lead to electrical failures or safety hazards.

A minimum resistance of 5 Megohms indicates a good level of insulation, providing confidence that the coils will perform reliably under operating conditions. If the insulation resistance is lower than this threshold, it may suggest the presence of moisture, contamination, or deterioration of the insulation material, which could result in electrical leakage or shorts.

The other values presented do not align with the general industry standards for insulation resistance testing of such equipment under these conditions, which typically advise for a minimum of 5 Megohms as a baseline for acceptable insulation integrity.