Splicing onto an existing cable and extending it to a new place is OK; however, be sure you splice all wires together color to color, including the ground wire. Never cut a non-essential wire, especially a ground wire. It's possible to create a dangerous situation if not done correctly.
The first thing you need to know is whether or not your local building code allows you to do this. If so, then go for it! Otherwise, you'll need to get a permit from your local building department before you can begin work.
You should use only metal connectors for wiring joints. Aluminum conductors cannot be joined by melting them together like with copper conductors because they will not fuse together. Instead, aluminum conductors must be joined using special connectors called enamel coated connectors or metal staples. Do not use regular household staples because they won't hold the connection together strong enough for normal use.
If your building code does not allow for splicing of cables, then you'll need to replace the existing cable with one that is longer. This is most likely not an option unless you want to tear up part of your wall or add some extra clutter to your flooring. In this case, you'll need to get a new cable installed by a professional who can handle tasks like this safely and properly.
Yes, as long as you use the correct size wire nut for the size of the wires you're splicing. I've discovered that tightly twisting the stripped section of the wires and then clipping the wires at the top results in a good spliceA and a much better wirenut fit.
It's also important to use heat-shrink tubing or electrical tape to cover the spliced area of the cable. This helps prevent moisture from getting into the joint and causing problems down the road.
Four-wire outlets and switches are very common in older buildings. These devices need to be replaced so they can be controlled by one switch or receptacle instead of separate ones. It's best to replace them all at the same time so you don't have any broken wiring lying around your house.
If you don't want to replace the whole box, be sure to also replace the trim piece that covers the opening when you repair damaged wiring. This protects people from being shocked if they touch anything inside the box while they're working on other parts of the circuit.
The last thing you want is to create a new problem with water entering the box through a splice or outlet change. This can cause serious damage over time.
So yes, you can splice four wires together.
With all of the layers that make up a coax cable, splicing two ends of a severed wire might be fatal. However, you may rejoin the line using a coax coupler by replacing the damaged ends of your coax cable with new connectors. The process is simple to perform and usually does not require any equipment other than what's supplied with the coupler. Before you begin, it's important to note that primary cables should never be joined or modified unless there is a good reason for doing so. Doing so could cause problems with signal strength or interrupt the flow of electricity through the cable, which could result in damage to your television receiver or other devices connected to the cable system.
A coax coupler is a device used to connect together two sections of coax cable. There are several types of couplers available, but all work on similar principles. One end of the coupler has a female connector while the other end has a male connector. You will need to join the ends of the coax cable that need to be patched together with one of these connectors. Then, plug the other end of the coupler into another portion of the coax cable that is still intact. The female connector on the first piece of coax cable will fit into the male connector on the second piece of coax cable, allowing you to connect the two sections of cable together.