How to cut and/or extend rope light

This technique can be used to shorten incandescent rope light, splice two pieces of incandescent rope light together or add a plug to a piece of incandescent rope light. In the examples below, we'll be adding a 120vac wire plug.

Tools needed:

• Sharp utility knife and/or wire cutter
• Needlenose pliers
• Awl (or make your own)
• A few 1" brads/small nails
• Soldering iron (to tin wires)
• Silicone glue
• Shrink tube (large enough for your rope light)
• Heat gun

1 - Incandescent rope light can only be cut in specific places. Look for a section that has two wires like the picture below. The rope light can be cut between the two wires. Cutting it elsewhere usually doesn't work and if it does, you'll likely find that there are fewer bulbs in the section which will cause them to run hotter, probably shortening their effective life. Cut the rope light straight across with a clean cut, either with a good wire cutter or sharp utility knife.

2 - Strip about 3/4" of insulation off the plug wire and separate the two wires a bit. Twist them very tightly so there are no stray wires and tin the entire bare wires using your soldering iron. It's important that the wires are smooth and tightly wound to minimize their size as much as possible. The tinned ends become the connectors and will be inserted into the rope light ends.

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3 - You will need an awl or other sharp, pointed tool to make space for the tinned wires in the rope light end. You can make an awl by driving a finishing nail into a short piece of wood and filing the end sharp like the example below.

4 - Insert the awl into a power wire in end of the rope light, twisting it and gradually enlarging the hole to make it large enough for the tinned wires. Take your time and be careful. It's a good idea to put the rope light into a vise instead of holding it with your hand because if you slip, you'll drive the awl into your hand or arm. And alternate way of doing this is to use a small finishing nail or brad and lightly hammer it into the power wire, and leave it there temporarily. In the photo below, note that the nails driven into the end of the rope light are about the same diameter as the tinned wire. This will make it a bit easier to insert the wires later.

5 - Slip a selection of shrink tube over the rope light and slide it down a bit. It's often easier to do this now than slide the tube on later. Then working with one wire at a time, insert the tinned wires into the holes. The holes you made with the awl or the nails will begin to shrink immediately so you must be quick with this step. You'll probably need the needlenose pliers to grab the wire and push it into the hole. Push it in as far as you can but realize that it probably doesn't have to go in all the way.

6 - Slide the shrink tube up so the joint will be about in the middle and inject some silicone glue down near the tinned wires. It's not necessary to fill it since when you heat the shrink tube, it will compress the glue for you. Then use the heat gun to shrink the tube. Notice that some of the glue may come out -- that's okay. Just wipe the excess off.

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7 - Let the glue set overnight.

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