Wiring Accessories

Wiring Accessories

Wiring Accessories

Wiring Accessories

Under the heading of lightening accessories, come the switches, lamp holders, ceiling roses, socket outlets and plugs etc.

Switches:

A switch is used to make or break the electric circuit.

It should so operated that it must make the circuit firm.

At the instant of breaking the switch it should break the current so that there is no formation of are between the switch blades and contact terminals. 

Formation of are burns or damages the switch contacts.

Such so as to have a quick action.

Following are the various types of switches.

Surface Switch:

These switches are mounted on the mounting blocks fixed over the surface of the wall, i.e., such types of switches project out of the surface of the wall.

These are of two types.

Single-way Switch:

This switch is provided with a single pole to control one light point at a time.

Two-way Switch:

These are used for wiring circuits which are to be controlled from twi points independently such as stair wiring .

Flush Switch:

These switches are fixed in flesh with the wall and do not project out.

Such types are used where high quality performance and appearance as desired.

Now-a-days in every new bulit house such types of switch are used.

Sometimes these swiches are called Paino type switches.

All above written swiches are made for 5A, 250V and 15A 250V.

Pull Switches or Ceiling Switches:

These switches are fixed on the ceiling and all the alive parts are out of reach of the operator.

These ars operated with a single pull on the card for the on and off position. These switches are used in bath rooms where water heater are used. These are also used in bed-rooms.

Gird Switches:

The grid switches are similar to tumbler switches, except that they are lighter and are portable type, so thay are used for the portable machines such as hand drill, portable grinder, etc.

They are manufactured either in single-way or two-way pattern both for 5 and 15 amperes.

Rotary Switches:

These switches are much different from the ordinary tumbler switches.

These switches are used for hot plates voltage stabilizers, etc., where many tapping are taken.

Push Button Switches:

These switches are used for bell circuits, refrigerator lighting circuit.

Iron Clad Water-Tight Switches:

Such switches are of carst iron, have very robust construction and are used for outdoor lamp controls.

Knife Switches:

The knife Switches consists of blades hinged at one end and are arranged to go into forked terminals or jaws at the other end.

These are available as single throw switches or double throw switches.

These are used for electroplating work.

Lamp holders:

As the name shows, a lamp holder is used to hold the lamp required for lighting purposes.

These holders can be classified as

(i) Bayonet cap lamp holders which can further be sub-divided into.

(a) Pendent holder- used for hanging lights upto 250 watts.

(b) Batton holder- used for wall fixed light upto 250 watts.

(c) Screwed holder- which when used with a bracket is called as bracket holder-upto 250 watts.

(ii) Screw lamp holders: These type of holders are used with screwed type, lamps upto 1000 watts 250 volts.

(iii) Fluorescent lamp holders: These arw either bi-pin type or of baycnent cap type, but pin type holders are generally used.

Ceiling Roses: 

These are used to provide a tapping to the pendent lamp holders, fan or fluorescent tube through the flexible wire.

These are two types:

(i) 2-plate type

(ii) 3-plate type

 According to Indian Standards 732-SI

(a) A ceiling rose or any other similar attachment shall not be used on the circuit, the voltage of which normally exceeds 250 volts.

(b) Normally only one flexible cord shall be attached to a ceiling rose.

(c) A ceiling rose shall not embody fuse terminal as integral part of it.

Socket Outlet: 

The socket outlets have all insulated base with moulded or socket base having 3-terminal sleeves.

The two thin terminals sleeves are meant for making connection to the cable with the third terminal sleeves thinker in cross-section is used for earth connection.

The cover is again moulded and has corresponding 3 holes.

There are made for 5 amps, and 15 amps load.

Plugs: 

For taking power from socket outlets, 3 pin plugs and used.

These are also made for 5 amps and 15 amps.

Main Switches: 

The main switches are used to control the whole supply for a house of office.

These are following types:

I.O.D.P:

Iron clad double pole main switch used for single phase supply control and is made for 15 amps., 30 amps.,60 amps., 100 amps., 250 volts.

I.O.D.P: 

Iron clad triple pole main switch used for 3-phase supply control and is made for 15 amps., 30 amps., 60 amps., 100 amps., 150 amps., 200 amps, and 500, volts 3-phase, 4-wire main switches are also available on neutral fourth wire link is used.

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