Why a New 240 Volt Circuit Produces 120 Volts
Why is my 240 volt circuit only showing 120 volts? How to Correct Incorrect Circuit Voltage.© By: Dave Rongey
Electrical Panel and Circuit Breaker Types
Electrical Question: Why is my 240 volt circuit only showing 120 volts?
I pulled 10/3 wire from my panel to the dryer unit and installed a 30 amp breaker. I’m getting 110 on each leg but get nothing when crossing them. I already replaced breaker and get the same thing.
This electrical wiring question came from: Joe, a Handyman from Tewksbury, Massachusetts.
Additional Comments: very informative
Thanks for your electrical wiring question Joe.
Application: Electrical Wiring.
Skill Level: Intermediate to Advanced – Best performed by a Licensed 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, turn it OFF and Tag with a Note before working with the electrical wiring.
Electrical Wiring Parts and Materials: Electrical parts and materials 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 local area. A permit and inspections may also be required.
How to Correct Incorrect Circuit Voltage
There are some electrical panels which do not have a standard configuration which will produce 120 volts instead of 240 volts, this is one of those types of panels, but there is a solution.
Joe, you’ll need to re position the circuit breaker in the panel because you are not attached to separate buses. This has to do with the type of circuit breaker you have and the brand of the electrical panel.
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This article looks at common 120 volt and 240 volt house wiring circuits and the circuit breakers that are installed identifying the types and amperage sizes used in most homes.
The Following will assist you with your Electrical Question
Home electrical wire
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.
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Wiring a Dryer
See an electric dryer installation with a typical 220 Volt electric power cord wiring system. You may find yourself with either a 3-wire or 4-wire electric dryer, or a 3-wire or 4-wire outlet. Lets look a how the electric dryer is wired and what to do if your cord does not match the plug.
For more information about 220 Volt Wiring Diagram
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Wiring 220 Volt Electrical Outlet
Home electrical wiring includes 110 volt outlets and 220 volt outlets and receptacles which are common place in every home. See how electrical outlets for the home are wired.
This link is helpful as a Handyman
The following may also be helpful for you:
Be Careful and Be Safe - Never Work on Energized Circuits!
Consult your Local Building Department about Permits and Inspections for all Electric Wiring Projects.
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