I was wondering why insulation readings for motors were less when using a megger to measure at the starter bucket and including the cables and motor as opposed to just testing the motor?
For instance when testing a motor alone we have lets say 100Meg L-g. And when testing cables we have lets say 50Meg L-G. However when we measure from the starter bucket testing both cables and motor we have lower values of lets say 25Meg L-G.
Why do we see lower values when measuring a combination in comparison with measuring the motor and cables seperately?
For instance when testing a motor alone we have lets say 100Meg L-g. And when testing cables we have lets say 50Meg L-G. However when we measure from the starter bucket testing both cables and motor we have lower values of lets say 25Meg L-G.
Why do we see lower values when measuring a combination in comparison with measuring the motor and cables seperately?
