Fellow Geeks
I have a submersible pump which is placed in an underground water tank. The connecting cable (3 phase) has a joint which is submerged in the water below. Although the wires are sealed using heat shrink sleeves + rubber tape, I still feel there is room for leakage. I wanted to check the impedance between the wires when the motor is not connected (ideally it should read Infinity).
Is there a cheap AC impedance meter which can perform this measurement for me? Cheap implies < $200 !!!
[Edit]
It should also be hand-held..
The proper tool for the job is an insulation resistance tester, which every person working on mains powered equipment should have. These are available for as little as US$50.
This tester will test the cable at a high voltage, typically 500V DC. The advantage of using a proper insulation tester is that the higher test voltage will show up cable faults that would otherwise would not show up with the lower test voltage of a multimeter.
A measured insulation resistance of less than 1M
is usually regarded as a fault condition that requires remedial action. However, check you local electrical code to verify the allowable insulation resistance limits that apply in your part of the world.