Using the Megger Meter for Insulation Testing

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The Megger Meter is primarily used for insulation testing. Using high voltage, the megohmmeter sends the equivalent of up to 1 million ohms of resistance to wire insulation. The megohm measurement discovers any type of break in the wire length using as much as 15,000 volts, and battery operated Megger test equipment typically generates between 1,000 and 3,000 V.

The steps to properly test using the Megger insulation test method are rather easy.

  • Make sure no power is to running through the wire being tested, and the wire should be isolated from the circuit.
  • All electric connections must be removed from test wire. Both wire ends should be exposed to reveal the copper connection. One copper wire end should be covered with a wire nut for conductor insulation to prevent ground short and false results.
  • The positive end of insulation tester must be attached to the bare connection on the copper end, and the ground wire connected to the electrical equipment’s metal ground. Most often the ground is located on the main’s panel box.
  • Turn on the tester and press the meter’s charge button. Observe as the wire is charged to full voltage. This process typically takes a few seconds.
  • Read meter display. Any reading that is larger than 999 Meg indicates good insulation on the wire while results below 1.00 Meg could mean problems. Anything between these two resistance readings usually means there are no operational issues with circuit.

Find the Megger testing equipment you need by visiting our online catalog or giving our support specialists a call on our 24 hour hotline. We offer testing and measurement equipment for rent or purchase, and our friendly staff can custom design a program that will fit your project needs.