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How to Splice Electrical Wire

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How to Splice Electrical Wire
How to Splice Electrical Wire - Intro

Two Wire Cables That Need to Be Spliced

© Lee Wallender; licensed to About.com
Once you know how to splice electrical wire in your house, you can do miraculous things. Want to add another outlet? Move your kitchen light five feet? If you know how to splice wires, you can extend wires.

The most important thing to know is that your splices will happen within a junction box. The junction box provides a safe environment for your wire splices--protecting them against impact and containing sparks and fire, if anything should go wrong. While junction boxes may at first seem unwieldy and unnecessary, you'll find that they are easy to work with and will make your work safer. Plus, they are required by Electrical Code.

Things You Will Need

First, make sure that you are joining two "like" cables. It's important that each cable be the same in terms of number of individual wires within the casing and the gauge of those wires.

Most modern wiring (even up to 50 years old or so) will have the gauge and number printed on the side. In the example shown here, we will be joining 12/2 Romex wire to 12/2 Romex-style wire. The "12" refers to the gauge; the "3" refers to the number of wires, excluding ground, within the casing.

Before you proceed, turn off the power to both wires at the service panel (fuse box).

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