How to Use Electrical Junction Boxes

By Dave Rongey - Summary:

What is the purpose of a junction box? How to Select the Right Junction Box for your Electrical Wiring Project, Installing Electrical Junction Boxes for Home Electrical Wiring.

Electrical Junction Boxes

Electrical Question: What is the purpose of a junction box?

  • Since we don’t have an interior breaker box we are connecting to the service panel outside which has plenty of space for additional breakers.
  • I know that we can add more wiring, and then from a junction box can I redirect more lines to other rooms that do not have enough wall outlets?

This home electrical wiring question came from: Danny, a Homeowner from Beeville, Texas.
See more about Home Wiring for Texas

Dave’s Reply:
Thanks for your electric wiring question Danny.
Great Question Danny.

Installing Junction Boxes for Home Electrical Wiring

Application: Electrical Wiring for adding 120 volt Wall Outlets and Installing Junction Boxes.
Skill Level: Beginner to Intermediate – Best performed by a Licensed Electrician.
Tools Required: Basic Electricians Pouch Hand Tools and a Voltage Tester.
Estimated Time: Depends on personal level experience, ability to work with tools and the number of outlets that will be added and the access to the location for the new outlets.
Precaution: Identify the existing outlet circuit, turn it OFF and  Tag it with a Note before working with the wiring.
Notice: Installing electrical wiring for additional outlets should be done according to local and national electrical codes with a permit and be inspected.

  • How to Select the Right Junction Box for your Electrical Wiring Project
    • There are several different types of electrical junction boxes, and there will be several different definitions of what a junction box is.
    • An electrical junction box, in the application is where there is a junction of electrical wiring.
    • This is also know as an electrical splice, or splice box. However the term junction box may also be used when someone is talking about an outlet box, simply because there are more than one set of electrical wire or cables that are found at this location.
    • The type and size of the electrical junction box will depend on the application and what it will be used for and where it will be installed.

More about Junction Boxes and Electrical Wiring

Home Electrical Junction Boxes

  • 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.

Electrical Outlet Wiring

  • Wiring Electrical Outlets for the Home

  • Home electrical wiring includes 110 volt outlets and 220 volt outlets and receptacles which are common place in every home. See how wiring electrical outlets for the home are done.

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Electrical Wiring

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


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