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12 | Electrical Installation | Learning Outcomes | After reading this chapter, the reader will able to . Classify the cables along with their Illustrate various methods of earthing specifications illustrate the components of low volt- age switchgear Differentiate fuse and circuit breaker Outline the batteries along with its types « Illustrate first-aid for electric shock Compare primary and secondary cells Explain the necessity of earthing/ | * Outline the energy consumption grounding calculations « List the factor effecting the choice of wiring + Illustrate different types of electric wiring schemes 12.1 Wire and Cable The use of conductors and their insulation is regulated by Indian Electricity (IE) regulation and Indian Standard (IS) code of practice. Wires and cables are the most common forms of conductors. They carry electric current through all types of circuits and systems. A conductor isa wire or cable or any other form of metal, suitable for car: rying current from generating sta- tion to the point where it is used. 12.1.1 Difference Between Wire and Cable According to Bureau of Indian Standards (BIS), wire and cable can be defined as follows: Bare Conductors: They have no covering. The best example is overhead transmission and distribution lines. Wire: Ifa bare conductor is provided with insulation, then it is known as a wire. The insulation Separates the conductor electrically from other conductors. Cable: It consists of two or more conductors covered with suitable insulation and surrounded ¥ @ protecting cover. The necessary requirements of a cable are that it should conduct Scanned with CamScanner { 1 i 
