AEMC 5100 User Manual
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Contents
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Megohmmeter Models 5000N/5100/5110- 38 -INTERPRETING THE RESULTSInsulation resistance values are a function of the type of insulatingmaterial. The actual value you read may vary greatly and is not asimportant as the trends of the values over time. This is why thresistance measurement must be taken in a greater context. Some otherfactors to consider are:Previous Testing ResultsThese are very important, since they will indicate the decline in theinsulation resistance over time. All new equipment should be tested anddocumented to serve as a benchmark for future testing.Careful Visual InspectionBy taking a very close look at theequipment you are testing it may bepossible to see cracks, excessive moisture, burn marks, etc., which may,over time, cause catastrophic equipment failure.Manufacturers’ Recommendations for Specific EquipmentThe definitive source for information ona specific piece of equipment isits manufacturer. Most manufacturers will provide basic informationabout the insulation resistance which may be encountered during testing.Comparisons with Similar EquipmentSimilar equipment should provide similar insulation resistance values.This would also remain true when testing cables. For three-phasesystems, it would be very useful to compare resistive values between thephases.By performing insulation resistance tests regularly and recording the testresults, it may be possible to predict failure by detecting a downwardtrend in the resistance. Careful notations should be made astime/date, temperature, applications, etc.The information contained in this manual is intended only as a guide toacceptable procedure; it is not intended to be used as a test specificationfor specific electrical equipment. |
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