I have discussed wring in several blog posts, here, here, here, here, here and here, among many others.
But what I intend for this post is compilation of the bricks that are used and how basic LED wiring can use these bricks.
First the bricks.
These are the basic Bricks that I use. The wiring shown in the very first picture is 30 gauge wire, either twisted by hand or purchased in the black two conductor ribbon cable. There is smaller wire (higher gauge number) available. However better tools are needed to use these smaller wires as I explained on my website. Just scroll down to wire sources.
These two pictures show how the 1 x 2 Brick with channel can be used. By placing 1 x n Bricks on either side it will provide some support. This method only allows for half of the channel to be exposed, but that is sufficient for the 30 gauge wire used.
This shows the wire running through the channel. Another 1 x 2 Brick with channel is added to help secure the one underneath.
This is the same idea, but using the 2 x 2 Brick with channels. With this brick you can run up to 4 wires up a column if needed. The axle hole in the middle can also be used.
Here I use to 1 x 1 round bricks to create a channel. You can also use 1 x 1 round plates to create the same channel.
These two pictures show how to run wire between two 1 x 1 round plates. The easiest way is what is shown. Place two round plates, then the wire followed by two more round plates. You can do it with just one layer of round plates, wire placement is just more tedious.
This shows a 2 x 6 plate covering the wire in order to hide it.
Finally this is a way to hide a wire run using 2 x 2 curved slope. Obviously a 1 x 2 curved slope will also work. I have used this technique to hide long wire runs. This implementation uses a 1 x 4 plate topped with a 1 x 4 tile. That stack could have been another 2 x 2 curved slope also.
These are just some of the possible ways to run wire inside a MOC. I am sure there are other bricks that can be used also.