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Electrical Wire and Cable

When Electrical Power is Lost to Half the Circuits

By Dave Rongey - Summary:

Electrical Panel and Circuit Problems: Part of my house power is out. I checked outlets and no power was found.

Home Electrical Power Failures

Electrical Question: Part of my house power is out. I checked outlets and no power was found.

Any thoughts or further ideas would be great.

This electrical question came from: Travis, from Orange, California.
See more about Home Wiring for California

Additional Comments: Great site and it did help.

Dave’s Reply:
Thanks for your electrical question Travis.

Electrical Panel and Circuit Problems

Application: Intermittent Electric Power Problem.
Skill Level: Advanced – Should be performed only by a Licensed Electrical Contractor and may require the local utility company or electric service provider.
Tools Required: Basic Electricians Pouch Hand Tools, Voltage Tester or Multimeter.
Estimated Time: Depends on personal level experience, ability to work with tools and troubleshoot and inspect electrical circuits and electrical system components.
Precaution: Depending on the symptoms, identify the main panel or panel circuit in question, turn it OFF and Tag it with a Note before working with the wiring.
Notice: Burnt or damaged electrical wiring and circuit components should be replaced with new electrical materials of the same voltage and amperage rating.

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2 Responses to “When Electrical Power is Lost to Half the Circuits”
  1. Dave Rongey says:

    How to Locate a Faulty Circuit

    Hi Bernadette,
    If the panel has been tested and their is no indication of a faulty part or connection, then there may be a problem with a circuit, or equipment that is plugged in or connected to a circuit, most likely a 240v circuit that is connected on the B side of the panel. It may help to connect a circuit on the A side as before, and start removing circuits on the B side, one at a time, while monitoring the circuit on the A side.

    Another way to locate a faulty circuit or equipment is to disconnect or turn off all the circuits on the B side, and connect one circuit on the A side. Test the A circuit to make sure the reading is normal, then begin connecting one circuit at a time on the B side while monitoring the A circuit. Once the reading of the A circuit is not normal you will have identified the faulty circuit on the A side.

    I hope this helps you,

  2. Bernadette Quinn says:

    Problem with Incorrect Voltage Readings

    I have little to no power from side A of the circuit box. I changed out the main switch. With no other circuits connected I am reading 240v grounded. Once I connect anything on side A I lose ground and not pulling full power. Side B is working perfectly. The electric company came out and checked their end and said everything is good.


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