Electrician Training Electrical Certification wiring recessed light fixtures Electrical Wiring Electrical Troubleshooting and Electrical Repairs wire outdoor light fixture Home Electrical Wiring Diagrams
wiring home generator and transfer switch wiring a 220 volt range cord outlet Wiring for GFCI Outlets Wiring Outlets and a Switched Outlet Wiring and Installing Ceiling Fans and Remote Controls wire dimmer switch wiring diagrams for switches wiring a dryer cord and 220 outlet circuit breaker panel
Electrical Wire and Cable

Electrician Working With Voltage Problems at Main Service

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.

More about Electrical Panels and Troubleshooting Electric Wiring


Electrical Circuits


» You Can Avoid Costly Mistakes! «

Here's How to Do It:
Wire It Right with the help of my Illustrated Wiring Book

Great for any Home Wiring Project.

  electrical wiring  

Complete Guide to Home Electrical Wiring

Perfect for Homeowners, Students,
Handyman, Handywomen, and Electricians
Wiring GFCI Outlets
Wiring Home Electric Circuits
120 Volt and 240 Volt Outlet Circuits
Wiring Light Switches
Wiring 3-Wire and 4-Wire Electric Range
Wiring 3-Wire and 4-Wire Dryer Cord and Dryer Outlet
How to Troubleshoot and Repair Electrical Wiring
Wiring Methods for Upgrading Electrical Wiring
NEC Codes for Home Electrical Wiring
....and much more.

Be Careful and Be Safe - Never Work on Energized Circuits!
Consult your Local Building Department about Permits and Inspections for all Electric Wiring Projects.

Electrical Tips to Help You Wire it Right

The Safest Way to Test Electrical Devices and Identify Electric Wires!

The Non-Contact Electrical Tester
This is a testing tool that I have had in my personal electrical tool pouch for years, and is the first test tool I grab to help identify electrical wiring. It is a Non-contact tester that I use to easily Detect Voltage in Cables, Cords, Circuit Breakers, Lighting Fixtures, Switches, Outlets and Wires. Simply insert the end of the tester into an outlet, lamp socket, or hold the end of the tester against the wire you wish to test. Very handy and easy to use.

The Quickest Way to Check for Faulty Electrical Wiring!

The Plug-In Outlet Tester
This is the first tool I grab to troubleshoot a problem with outlet circuit wiring. This popular tester is also used by most inspectors to test for power and check the polarity of circuit wiring.
It detects probable improper wiring conditions in standard 110-125 VAC outlets Provides 6 probable wiring conditions that are quick and easy to read for ultimate efficiency Lights indicate if wiring is correct and indicator light chart is included Tests standard 3-wire outlets UL Listed Light indicates if wiring is incorrect Very handy and easy to use.

Strip Off Wire Insulation without Nicking and Damaging the Electric Wire!

The Wire Stripper and Wire Cutter
My absolute favorite wire stripping tool that I have had in my personal electrical tool pouch for years, and this is the tool I use to safely strip electrical wires.
This handy tool has multiple uses:
The wire gauges are shown on the side of the tool so you know which slot to use for stripping insulation.
The end of the tool can be used to grip and bend wire which is handy for attaching wire onto the screw terminals of switches and outlets..

The wire stripper will work on both solid and stranded wire. This tool is Very Handy and Easy to Use.

More articles about Volt Readings and Home Electrical Wiring:
« Previous Next »
Is a Hot Light Switch Safe? Altering Generator Transfer Switch Connections


If you are asking a Quick Question please make sure it is about This TOPIC:
“Electrician Working With Voltage Problems at Main Service”

Comments Posted here are Open for Quality Discussion and Participation.

By submitting you agree to our Site Terms