1.

Discuss the main feature of a domestic wiring systemwith the helpof a schematic diagram of one of the common domestic circuits .

Answer»

Solution :
(1)In our homes , we receive SUPPLYOF electricpowerthrough a MAIN SUPPLY (also called mains), eithersupported through overhead electricpoles or byunderground cables .
(2) This supply is through the live/ positivewire (red insulation cover ) , neutral / negative wire(black insulation cover) and theearth wire (green insulatio cover).
(3) The potential difference betweenthe livewireand neutral wire is 220 V andthe frequency of AC is 50Hz.
(4) At the meter -board in the house , thesethree wires pass into an electricitymeter through a main fuse .
(5) Through themainswitch theyare connected to thelinewires in the house .
(6) These wires supply electricity to separatecircuits within the house .
(7) OFTEN, two separatecircuits are used ,one of currentrating 15A forapplicances with higherpoweratings suchas geysers, air coolers , etc and the other of currentrating 5A for bulbs , fans ,radio etc.
(8) Theearth wireis usually connected to a metal plate deep in the earth near the houseas local earthing .
(9) Inside the house ,in eachseparate circuit,differentappliances are connected across the liveand neutral wire. Eachappliancehas a separate.ON./.OFF. switch to complete the circuit or to discontinue te currentin thecircuit .
(10) In orderthat , each appliancehas equal potential difference, all appliances are connected in parallel across the supply.
[Note: See Chapter 12 for advantages of a parallel connection].


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