COMPUTER AND ELECTRICAL CONNECTIONS....

     

     Have you ever experience electrical shocks when you touch your computer , refrigerator, washing machine when they are in use ? Or Have you ever experience power cut while its not from the supply company (i.e. there is electricity in your surrounding exept your house or room ? Let us now discuss over these facts along with some information on electrical connections in our houses.

     The electric supply companies delivers AC (220 Volt, 50 Hz) through supply lines (wires mainly of Aluminium). These lines are called Phase or Live wires. there is also a neutral wire which completes every household circuit.

MAIN SWITCH or FUSE

   

     The LIVE and NEUTRAL wires are first connected to the Main Switch. Then the Live wire is fed to a Meter which measures electrical energy consumption. Fuse are connected for security. A Fuse wire is an Alloy of Tin and Lead (75% Sn + 25% Pb). It has Higher resistivity but lower melting point. Thus if for any reason current of the supply line increases, it melts and disconnect the household circuit from the main line.

 DISTRIBUTION BOARD

        Live wire from the main switch is connected to the distribution board through another fuse. From fuse the wire is fed to different switches for different appliances. There are switches, three pin plugs, indicators in a board. The live wire is first connected to the switch for the three pin plug , then from switch the wire is connected to the thee pin plug's one side ;from there to all other switches. The neutral wire starts from the appliances and ends at the three pin plug's second side and from there the wire goes to the neutral wire of the distribution line.

SWITCH

       A switch is a circuit component that can make a circuit open or close with a stroke. It is such configured, that by the help of a spring and a lever it can connect or disconnect two points. One of those point is connected to the Live wire and the other is connected to the appliance. If by stroke we make the Switch 'on' then current flows up to the appliance. The second end of the appliance is connected to the Neutral wire of the supply line.

 THREE PIN PLUG

       There are some electrical appliances such as Computers, Refrigerators, Washing machines, are used temporarily.These are connected to the supply line through Three Pin Plug. There are three wires in a three pin plug. One is Live , the second is neutral and the third is Earth .These wires are of different colours The Live wire is Red or Brown. The Neutral wire is Blue or Black. The Earth wire is Green. The color code is maintained during wiring so that any one can recognize the wires later.

EARTHING
       The Earthing is done by metallic rod and broad gauge wire . At first we dig a little. the wire is connected to the rod and the rod is buried in the pit.then  we pour plenty of salt and charcoal there. This wire is connected to the electrical switch board . the earth wire of three pin plug is connected to this wire.

        During use electrons gather on the  outer metallic surface of some household appliance. Heavy gathering may damage the appliance. These electrons are carried to earth by this Earth wire. If Earthing is not good enough then you may experience a shock when you touch the electrical appliance.

CONNECTION OF A PC
         
          If you want to use a PC at your home then at first make a good electrical wiring with very good earthing. If you are using UPS( un-interepted power supply- i.e. if there is a load shedding it can feed back power for almost 30 to 40 minutes) then connect its three pin plug to the three pin socket of the switch board.There are three Three Pin Sockets at the back of the UPS. Here we connect monitor, cpu and music system power chords. 

SWITCHING ON A PC

Firstly switch on the switches on the switch board. 
For UPS to use, turn on its switch on its front side ( some times on the backside)    
Turn on the power button on the CPU  
Wait a while ..... It will run automatically