Cable joints connect electrical power cables. Since electricity has many uses, power cables come in many shapes, sizes and configurations. Because of this, joints used to connect those cables come in varieties. They differ in their design as well as their capacity.
Cable joints are available for low, medium and high voltage power cables. If a cable joint has a lower power capacity than the cable itself, the joint may fail under the stress of the electrical current.
Cable joints have differing basic structures based upon how two cables are to be connected. Some cable joints simply connect two power cables at one point. Some accommodate a cable branching off of or coming into the main line.
Different types of cable joints are necessary for different types of power cables. Cables can have layers of paper of polymeric insulation and need a cable joint that is compatible with the given cable's insulation.
Power cables can have a single or multiple insulated cores. For a cable joint to function, it must have the same number of cores as the cables it is connecting.