You should be able to buy one anywhere these sorts of parts are sold - computer stores in particular. Or, online stores sell them, too. A site called Instructables has directions to make them yourself if you want to go that far.
Either online suppliers or at any good computer store
No, you can do it the other way around, though.
Multi strand cables that can be spliced include unshielded and control cables, shielded signal and control cables, and 1000 volt cables. Special kits to splice these types of cables are sold by companies like 3M.
It's very expensive, and difficult to splice two cables together.
A splice is usually two rope ends joined together to form a longer rope. A Y splice is three rope ends are joined together to form a Y shape. The same can be said for connecting three electrical or component cables.
splicing is of optical fiber cable where as jointing is of cther cables
The main ground should not have a splice to ensure continuity of the ground. The reality is that this is done in some cases. If the splice should loosen or be intermittent you will create a shock hazard.
"U" type cable clamps I recently needed to replace a battery cable and found them to be relatively inexpensive. Especially when I considered the labor I was going to put into making the "splice" and then weather-proofing the connection. FYI - Less than $10 for cables over 40" long.
One splice that would work is a western splice.
The long splice, the short splice, the end splice, and the eye splice are probably the most commonly used types.
Four full tucks should be put in an Admiralty Eye Splice before removing the outer layer of the strands and doing a further two tucks with the cores. This tapers the splice. Cut off the strands and outer cores with about 2cm sticking out from the splice to prevent them slipping when the eye is under tension. Parcel and serve with a heavy grease.
splice is supuraisu
A short splice will nearly double the diameter of the material, but will be shorter in length and not as strong as a long splice.