An insulation resistance tester (commonly called a Megger after a prominent company that manufactures them) is operated by hooking it up to a piece of electrical equipment and running voltage across the insulation on the equipment. The Megger calculates how well the electrical insulation on the equipment is working by checking how much current is flowing between the Megger to the machine. The higher the resistance, the less current will flow, amounting to better electrical insulation shielding. This is important, because poor insulation leads to equipment breaking down.Continue Reading
To test for insulation resistance, make sure to isolate the equipment from any other sources of current. Turn off the equipment, and disconnect it from other components. If it is not possible to completely isolate the equipment, observe what other conducting parts it is connected to, such as cables or wires, and be aware that the insulation resistance rating will be lower than due to these other components. Ground and discharge the equipment to prevent sparks or electrocution both before and after testing.
Attach two leads from the Megger across the equipment's insulation, with one lead on one side and one on the opposite side, and run the voltage on the Megger for at least one minute. The device will calculate the resistance using Ohm's Law and give the resistance rating in megaOhms.Learn more about Electrical
Megger test record cards allow for detailed reports of the function and performance of electrical equipment, using testing instrumentation produced by the Megger company. Megger testing kits include cards for electricians to record test results, which then can be entered into databases and referred to for maintenance, repairs and detailed evaluations.Full Answer >
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Megger readings are the result of an insulation test. The term Megger is also known as the insulation resistance test or IR test. Megger readings vary and are used to track the insulation manufacturing process to catch any problems that may need to be resolved before they are outside of the allowed limits. Megger readings also check the condition of the insulation and to find the highest point of resistance.Full Answer >
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