Using the name given in this wiring diagram. It is encased in plastic with a lid over the PVC insulated wires. As a result of this, the wire casing and cap gets its name. Electrical wiring refers to the process of delivering electrical energy from suppliers to household appliances such as lamps, fans, and other domestic equipment. It's one of the most basic kinds of electrical wiring. The best precaution is to put porcelain cleat or washed in between the wall and casing if wire has to be in casing capping.