How to extend a wire if an existing wire is short in the junction box?
The answer depends on what type of access you have to the junction box. The wire external to the box may have some slack that can be brought into the box. If everything is tight you will probably have to install one or more additional junction boxes or rerun wire from electric panel As an example assume that the short wire has no external slack, but you can install a new junction box near the other box and in the path of the short wire 1.
Pull the short wire from existing junction box 2. Install new box in path of short wire so more slack will be available in the additional junction box; and pull wire into new box 3. Run a wire of the same size from new to old box and re-splice any connections for original short wire or new connections; and connect this new wire to the original short wire in the new box Make sure you follow all code requirements for your locale.
If you have an electrical box with wiring that is too short to make electrical connections to outlets, switches or even another junction box, you will need to add 'pigtails' to the wiring in order to lengthen the wiring so you can use it. A 'pigtail' is simply an extension that is added to a piece of electrical wire and is very easy to make. This simple how-to guide will show you everything you need to know.
Before you do anything, find the main breaker box in your home. Then, locate the breaker switch that provides power to the junction box you want to work on. Once you have located the correct switch, set it to the 'off' position.
Use the screwdriver to remove the screws from the cover plate on the junction box. Set the screws and the cover plate aside as you'll need them later. Pull the wiring out through the front of the junction box as must as possible.
This will make working with the wiring much easier. When pulling out the wiring, try to separate it and make the wiring as straight as possible. You'll now need to determine how long the length of the wire extensions you will need to create.
So, you should measure the distance from the junction box to where you need to make a connection. After you determine how much wire you will need, use the wire cutters to cut lengths of wire using that measurement. After you've cut the wire, use the wire strippers to strip the both ends of the wire about 1/2 inch.
Take one end of a piece of wire that is just cut and twist it onto one of the pre-existing wires. Do this for all of the wires in the junction box that you want to extend. After you have finished connecting all of the newly created pigtails to the existing wiring in the junction box, take wire caps and twist them onto the connections.
This will create a tighter connection and also insulate the new splices from electrical arcs or shorting. Once you secure the wires with wire caps, you can then use them where they are needed. Replace the cover plate of the junction box and use the newly created pigtails to install outlets or switches or to run to another junction box.
Once you have finished adding the wiring extensions, you can simply go back to the main breaker box and turn the power back on. However, make sure that the ends of the pigtails are either capped with a wire cap or are connected before you do so.
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