How to Use a Megger to Test a Circuit

Save

A megger is a type of megohmmeter used for testing electrical insulation in industrial settings. Although a conventional ohmmeter can perform well in most commercial settings, it is incapable of handling the high-voltage capacity of the megger. This is due to the fact that meggers can supply the voltage required to test the large conductors necessary for high-voltage circuits. While megging a circuit is quite easy, the safety issues at hand must be properly addressed, as any major mistakes could result in electrocution.

Things You'll Need

  • Electrical wires
  • Padlock
  • Yellow caution tape
  • Flat-head screwdriver
  • Cut off power to the circuit to be tested by flipping the breaker and locking it off with a padlock.

  • Surround the work area with yellow warning tape to protect anyone from accidentally touching the bare end of the cable.

  • Touch one megger probe to the bare end of the cable, then touch the other probe to the grounding screw of the system in which the cable will terminate.

  • Turn the megger handle manually and look for a rendering between 2 and 1,000 megohms. Insulation issues are indicated by any reading that is below 2 megohms.

  • Terminate the bare wire into its intended device using a flat-head screwdriver. Remove the yellow warning tape and the padlock. Restore the power to the circuit.

References

  • "Electrician's Pocket Manual" (Pocket References, McGraw-Hill); Rex Miller; 2005
  • Photo Credit bio battery image by dinostock from Fotolia.com
Promoted By Zergnet

Comments

Resources

You May Also Like

  • How to Use a Megger Insulation Tester

    Things You'll Need. Electrical hand tools; Plastic wire nuts; Show More. Instructions. 1. Remove all electrical power from the wire that is...

  • How to Use Megger Test Equipment

    How to Use Megger Test Equipment. ... The megohmmeter, also known as a "megger," reads high voltage resistance measures in electrical circuits...

  • How to Connect a Megger

    The megger, also known as the Mega-Ohm tester, is used to test the integrity of insulation between conductors. Meggers have around since...

  • How to Megger a Transformer

    Insulation tests rest primarily on the overall condition of the electrical equipment used to conduct the test. Dust, grime, humidity, oil, corrosion,...

  • What is a Megger Tester?

    In what types of situations exactly are Megger testers generally used? Megger testers are useful and convenient for telecommunications testing, ...

  • How to Test Cable With a Megger

    The megohmmeter, also known as a "megger," reads high voltage resistance measures in electrical circuits and motors. It is more commonly used...

  • How to Use a Megohmmeter

    The prefix "meg" describes a numerical ... When you are testing high voltage ... Inevitable damage to electrical cables can cause them...

  • How to Know If Your Battery Cables Are Bad

    How to Know If Your Battery Cables Are Bad. ... A bad battery cable can make you ... A car that does...

Related Searches

Read Article

5 Small Entryway Decorating Ideas

M
Is DIY in your DNA? Become part of our maker community.
Submit Your Work!