We're going to go over splicing a 22-gauge two conductor, cable with a shield. These cables are ubiquitous in automation and control systems. It's used for sensors relay circuits and communications networks. First, we'll strip back the jacket of the cable and remove the foil shielding.

Some cables also have a string in here. You'll want to use a specialized cable stripping tool as it'll leave a nice clean cut. Now we're going to need two small pieces of heat shrink tubing that will go over the individual conductors and insulate them from each other, and the shield will need to strip back the conductor insulation. We want to have a comfortable amount to work with maybe about a half an inch or so we'll then take a larger piece of heat shrink.

Tubing long enough to cover the splice about six inches, usually works and slide it over the cable either end will work. Of course, if the splice is in the middle of a cable run, you'll really want to get all of the heat shrink on before you start joining cables as it'll be very hard to do so afterwards. Next, we'll take the individual conductors and start to twist the stranded ends around each other. This can be a little bit tricky at first until you get some practice, which is why you'll want to have enough of the insulation stripped to leave you wire to work with focus on getting one side completely twisted before moving on, to the other, make sure the Conductors are separated as much as possible to allow for easier soldering you'll want to make sure the soldering iron is hot enough, that it melts the solder on contact and the solder sits on the tip and does not beat up and roll off.

You'll then want to wipe the excess solder off on a damp sponge or damp paper towel or cloth, or anything really when joining the wires. You'll want to dab a little bit of solder on the tip of the iron and hold that to the bottom of your joint. This will allow it to conduct a lot of heat into the joint. You don't want to melt the solder over the joint, but rather allow it to melt and be pulled in.

You really don't want to contact the solder with the soldering iron directly. Try to use only as much solder, as is necessary. You'll want to watch out for blobs and sharp edges that will poke through the heat shrink insulation. Now all we've got left to do is shrink down the heat shrink.

I like to use a butane torch, lighter, as it provides a lot of heat in a very accurate position and doesn't put off any soot, make sure to apply a small portion of heat shrink tubing to the end of the cable. This prevents the inner foil shielding from coming into contact with anything conductive, be sure to apply some solder to the end of the stripped wire. This keeps strands from fraying and potentially shorting out the communication signal. It also makes it a whole lot easier to land it on terminals, make sure the end of each cable is labeled, showing where the other end of the cable goes.

I think by far the easiest tool to use is a butane, soldering iron they're readily available at Home, Depot or Lowe's, or on Amazon, where I got mine.