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Electrician Working With Voltage Problems at Main Service

By Dave Rongey - Summary:

How to Identify Problems with Main Electrical Service Voltage: Main electrical service with incorrect Line Power and Neutral Voltage readings.

Incorrect Electric Voltage Readings

Electrical Question: Main electrical service with incorrect line power and neutral voltage readings.

Hi Dave, I’d like your help with a emergency service trouble call I am working on.


This electrical wiring question came from: Roy, a Contractor from Payson, Arizona.

Dave’s Reply:
Thanks for your electric wiring question Roy.

How to Identify Problems with the Main Electrical Service

electrical service circuit breaker

Application: Testing Incorrect Power Problem and Circuit Wiring of the Main Service.
Skill Level: Advanced – Should be performed only by a Licensed Electrical Contractor and may require the local utility company or electric service provider if the problem is on the utility side of the electrical service.
Tools Required: Basic Electricians Pouch Hand Tools, Voltage Tester, Multimeter, clamp on current amperage meter.
Estimated Time: Depends on personal level experience, ability to work with tools to troubleshoot and inspect electrical circuits and electrical system components.
Precaution: Depending on the symptoms, identify the main panel or panel circuits in question, turn it OFF and Tag it with a Note before working with the wiring. All precautions and protection gear and clothing must be worn to protect against potential arc flash and electric shock.
Notice: Burnt or damaged electrical wiring and circuit components should be replaced with new electrical materials of the same voltage and amperage rating. Electrical inspections may be required before restoring power to the electrical service.

How to Inspect and Identify Problems with a Main Electrical Service

IMPORTANT NOTE: The following procedures are NOT recommended for Homeowners, however this will help educate Electricians and Electrical Students about the cause and corrections for incorrect voltage problems.
Homeowners: If a homeowner is experiencing a problem like this then please consult a Professional Licensed or Certified Electrician.

  • IMPORTANT: Be careful and keep yourself well insulated.

    • The voltage on the neutral can be lethal as you may know.

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