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Electrical Junction Box Splice

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Summary: 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.

How to Make an Junction Box Splice for Electrical House Wiring

Electrical Junction Box Splices

Always locate electrical junction boxes in an access able area.

Use approved junction boxes.
See more about types of electrical junction boxes

Use the correct size wire connector.
See more about electrical wire and wire connectors

After the splice is made be sure to place a cover plate on the box.

Making an Electrical Junction Box Splice

Step 1: Always identify the electrical circuit and make sure it is off.

junction box splice 1 Always be sure the circuit is off and test before proceeding. Install a Junction Box in an accessible area. Bring the wires into the box and allow enough length to make your splice.

Step 2: Using a good pair of wire strippers and pliers.

junction box splice 2 After stripping back the insulation about 3/4" , twist the bare wire in a clock-wise direction. Trim off the end of the wires evenly.

Step 3: Use approved wire connectors that are the right size for the splice.

junction box splice 3 Select the right size wire connector, otherwise known as a "wire nut". Notice the depth of the connector, your twisted wire sets should not be longer than the depth of the wire connector internal area. Screw the splice connector onto the twisted pair in a clock-wise motion until the connector is good and snug. The bare wire should be all the way into the wire connectors. Bare wire should not be seen. If bare wire is seen, back off the wire nut and trim more of the twisted wire sets and reinstall the connector.

Step 4: Fold the spliced wires carefully back into the junction box.

junction box splice 4 Fold the wire sets carefully into the junction box.

Step 5: Always install a blank cover onto the junction box.

junction box splice 5 Place a blank cover on the junction box and you're all done! You have now made a legal and accessible splice. Turn on the circuit when all the work is completed and completely checked and verified.

Electrical Codes about Junction Boxes for Home Electrical Projects

314.19 Wiring Methods junction boxes accessible Junction boxes shall be installed so that the wiring contained in them can be rendered accessible without removing any part of the building.

314.16 Electrical Junction Box Fill - The volume of electrical boxes shall be sufficient for the number of conductors, devices, and cable clamps contained within the box. Nonmetallic boxes are marked with their cubic inch capacity.

NOTE: This is a partial list of electrical codes. Other codes may apply. Some codes may be updated.
See the Electrical Code area for more information: Home Electrical Codes

Small Straight-Slot Screw Driver,
Lineman's Pliers,
Crimp Pliers,
Wire Strippers,
Sheath Knife,
Claw Hammer,
Volt Tester
Drop Light
Dust Mask and Eye Protection
Junction Box
Blank Cover for the junction box
Romex Wire
Romex staples
Yellow Wire or Red Wire Connectors
The electrical tools for each project may be different depending on the individual project requirements and the access to install electrical devices.
More about Electrical Tools
The electrical parts list will depend upon each individual project and the requirements to wire specific devices added to the project.
More about Electrical Parts

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