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Megging a 3 phase 480 volt motor - Electrician Talk What should the ohms be going from ground to phase on a digital megger? For a good motor should it read around what (400megaohms)? When the motor is bad it should read 0 ohms to ground? Need help clarifying this
Megger residential wiring - Electrician Talk A megger is simply a "megohm meter" and it only measures insulation resistance, at higher values than a regular ohm meter Generally a regular DMM operates at 9VDC on the ohm scale A megger will have selectable outputs of 50, 100, 250, 500, or 1000VDC to test insulation to ground or phase to phase as desired, at the proper voltage for the circuit under test It will not pin point the spot of
Megger - Electrician Talk Megger readings that do not stabilize, but fluctuate are indicative of moisture in or on the conductors and should be investigated Sometimes this reading will continue to climb as the moisture evaporates due to the test voltage When meggering one must be careful with the voltage levels you are trying to prevent future electrical damage to
megging a motor wired up - Electrician Talk A megger is used to test the integrity of insulation If you are testing a motor circuit wired to a MCC bucket or a VFD; Open the breaker in the bucket or isolated the VFD Always test your Megger first with leads together and leads apart Clamp onto the equipment ground with one lead and one of the T-leads with the other
Hi-Pot Vs Megger Testing - Electrician Talk I've never seen anyone hipot 600V cables A megger is a megohmeter, measures insulation resistance A hipot tester basically works the same way, but measures leakage current If you see a fault with the megger, you will see a fault with the hipot The hipot stresses the insulation weak points at higher voltage levels than the megger will I don't think the hi pot will do anything for you
What are expected Megger readings? - Electrician Talk You can damage this equipment or at a minimum get false readings Typically start with the lowest voltage your megger has, starting at 50, 100 or 250 VDC will minimize any chance of damaging equipment For trouble shooting single phase, I would megger Line to ground, line too neutral, neutral to ground
Motor Megs out Bad, Then Runs? - Electrician Talk It simply sums the three phase currents together (as a vector) and trips if the resulting calculated current exceeds around 10-20% of the average This is a much higher current than the micro amps that it takes to get a bad megger reading Read the manual because there are lots of causes for unbalanced currents not just a bad motor or wiring
Standards for Megger Testing - Electrician Talk I have looked through a bunch of posts regarding megger testing and not seeing what I am looking for I am looking for a “standard” that says this XX MΩ reading is a “pass” and this XX MΩ reading is a “fail” I am sure it is an IEEE standard, but I do not know for sure I have a couple pages