The Service equipment (Main Control board (MCB), entrance conductors, meter base, and associated hardware) must be adequate to safely supply the required load.
The main service equipment panel shall be mounted either outside or inside the dwelling at the point of entrance of the service conductors to the building.
Switches and outlets: Switch is an electric circuit always connected in live wire.
It makes or interrupts a circuit.
It consists of the rocker operated switch mechanism and its front plate and a box to contain the switch.
Switch and outlet boxes are of metal of sizes
The boxes are fitted to a recess or a chase in walls, fixed to walls for recessing in plaster or fixed on the surface.
The plastic front plate and switch or switches are screwed to the metal box.
Socket outlets popularly known as power points; consist of a box, socket outlet and front plate.
The socket outlet is designed to accept a plug connected to the flexible wire of an appliance.
Plug is a fixture provided with three cylindrical pins made of brass, embedded in plastic or Bakelite casing.
The live pin is on the right, the neutral pin is on the left and the earth pin is on the top.
In a good quality plug words L, E and N are marked on the case of plug.
Dual switch circuits Dual switches are double pole type.
When an electric appliance is placed in series in a pair of dual switches, it can be switched on or off from any of the dual switches.
Dual switches are generally used in staircases, long corridors etc.
Fuse It is acircuit breaker commonly used for protecting wiring and for safety.
It is the weakest point in an electrical circuit, which melts and breaks the electric circuit, when the circuits get over loaded.
Fuse wire is connected in live wire and not in neutral wire under any circumstances.
The reason is that in case the fuse is connected in neutral wire, it will certainly melt when overloading takes place.
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