# Causes of Inconsistent Voltage On a Circuit

 Why is there inconsistent voltage on a lighting circuit? Possible causes of a Light Circuit with Incorrect Voltage.

## How To Hook Up a Generator to the House Panel Using a Circuit Breaker Interlock Kit for Backup Power

NOTE: A List of All my Helpful Videos
Will Display at the End of This Video

with my online Video Course:
Basic Home Electrical Wiring by Example

Inconsistent Voltage with a Light Circuit
Electrical Question: Why is there inconsistent voltage on a lighting circuit?

Voltage Problems with a Lighting Circuit

• I wonder if you can help me understand what is going on with my lighting circuit. I was in the process of replacing a ceiling light and according to my non-contact voltage detector was unable to turn it off.
• I thought first that the 3-way switch was wired wrong but found that it is wired correctly. then, with my multi meter, I tested the voltage between hot and neutral in both switch positions and found something strange: on = 122v, off = 40v.
• There are other lights powered from this junction box so I tested them also (supply hot to circuit hot) and found: a=122v, b=104v, c=104v, d=82v. the switch leg I was dealing with measured 12v and 23v between leg to neutral with the main power disconnected. do you know what could be causing these strange voltages?
• I found no continuity between the neutrals and grounds. I also isolated each wire and verified where they go.

Thanks for your electrical wiring question Rex.

## Incorrect Voltage on a Light Circuit

Application: Incorrect Voltage a Ceiling Light.
Skill Level: Intermediate to Advanced – Best performed by a Licensed Electrical Contractor, or Certified Electrician.
Electrical Tools Required: Basic Electricians Pouch Hand Tools, Voltage Tester, and appropriate Safety Gear.
Estimated Time: Depends on the personal level experience, ability to work with tools, install electrical circuit wiring, and the available access to the project area.
Electrical Safety: Identify the electrical power source to the Ceiling Light, turn it OFF and Tag with a Note before working with the electrical wiring.
Electrical Wiring Parts and Materials: Electrical parts and materials for the Ceiling Light should be approved for the specific project and compliant with local and national electrical codes.
Electrical Codes and Inspections: Installing or changing home electrical wiring should be done according to local and national electrical codes as adopted in your specific area of New York. A permit and inspections may also be required.

### Incorrect Voltage in a Kitchen Light Circuit

This electrical wiring project is about Incorrect Voltage in a Ceiling Light Circuit in the Kitchen of an Old Home.

• Great Question Rex!
• From the information you have provided, let’s take a look at a few possibilities that may be contributing to this electrical problem that you have discovered:

### Light Circuit with Incorrect Voltage

Light Fixture Components

• It is possible that the inconsistent voltage readings may be caused due to various light fixture types, light fixture control switches, types of LED light bulbs that are installed, or low voltage power supplies for the light fixtures.
• Keep in mind that LED type lights typically operate with a built in electronic power supply.
• Electronic power supplies produce various problems with AC electrical circuits including electrical line disturbances, and they can produce dirty electrical noise conditions on the main power lines.

Improperly Configured Multi-Wired Circuits

• It is also possible that there are multi-wired circuits in the home that are not wired correctly, or that neutral wiring within the home has not been properly configured, or a combination of these two inconsistencies.
• As you can imagine, this is not something that a homeowner can fix, and to be quite honest, some electricians may not know how to track down and fix these problems. However there are some highly knowledgeable electricians that can take care of this for you, but you may have to ask them specifically if they know how to detect and repair incorrect wiring of multi-wired circuits.
• Correcting this problem will involve performing a some electrical tests and measurements with the circuit wiring at each panel located at the home, and then tracking down the problem areas at specific locations of electrical boxes, and then making the required changes in the electrical wiring connections.
• Additional electrical circuit wiring may also need to be installed depending on the extent of the circuit wiring problems that are discovered.

### Wiring a Light Switch – Diagram 1

Wiring Diagrams
Fully Explained Light Switch Wiring Diagrams. Detailed Electrical Wiring Diagrams and Pictures assist your Home Electrical Projects.

3 Way Switch Diagram

### 3 Way Switch Diagram

The key to three way switch wiring depends on two main factors. These wiring diagrams help you identify the power feed and the switch leg leading to the light fixture.

### Electrical Wire for the Home

Complete listing of electrical wire types and parts used for home projects with electrical code information serves as selection guidelines.

### Electrical Junction Boxes for Home Wiring

Understanding electrical junction boxes and what they are used for. Home electrical wiring is the process of installing electrical wire to a location that will serve electrical devices or an appliance. One very important component is the box where the wire will be installed. The type and size of the home wiring electrical boxes will depend upon the circuit size, application and its location.

### Kitchen Electrical Wiring

Fully Explained Photos and Wiring Diagrams for Kitchen Electrical Wiring with Code Requirements for most new or remodel projects.

### Planning and Installing Home Lighting

Home lighting articles covering recessed lighting, under cabinet lighting, lighting terminology and more.

### Electrical Junction Box Splice

Electrical junction box splices can be made safely when you understand the method. This example will show you how its done step by step and shows how to make a junction box splice and the related electrical codes.
Emergency Electrical Splices
Wiring Electrical Codes

Safety Checklist

### Troubleshooting Electrical Problems

Home Electrical Troubleshooting and Repairs
Licensed Electrician Reveals the Secrets of Successful Electrical Troubleshooting Methods used to solve the majority of the home electrical problems and wiring failures.

### Electrical Testers

The following may also be helpful for you:

## Dave's Guide to Home Electrical Wiring:

» 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.

## Complete Guide to Home Electrical Wiring

Perfect for Homeowners, Students,
Handyman, Handy Women, and Electricians
Includes:
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.

## Learn more about Home Electrical Wiring with my Online Video Course:Basic Home Electrical Wiring by Example

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

## 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 Electrical Wiring, LED Lights and Dimmers, Lighting Circuits, Testers and Meters, Troubleshooting and Home Electrical Wiring: « Previous Next » Installing Exterior Recessed Lights Recessed Light Conversion Kit and Task Lighting