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Unit 3

House wiring-Tools and Components- Electrical Safety in House and industry

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Domestic wiring in a house requires a number of electric devices to run

simultaneously. Thus, they should be independent of each other i.e. the working of

one device should not depend on the working of another device.For example, the working of a fan should not be affected when a bulb in the room gets

fused. In parallel circuits, if one appliance stops working, all other appliances work as

usual. Hence, parallel circuiting is used in house wiring or in lights used to decorate

buildings on occasions. This is done to ensure that if one bulb fuses, the others remain

functioning.

Typical House Wiring

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Types of Wiring

Stair case wiring

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Ceiling Fan Wiring

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Ceiling Fan Wiring

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A: Fluorescent

Tube B: Power

(+220 Volts) C:

Starter D:

Switch (Bi-

metallic

thermostat) E:

Capacitor F:

Filaments G:

Ballast

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Tools

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Multimeter

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Soldering Iron

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Wire StripperWire Cutter

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Components

Bayonet Caps

Baton Lamp Holder

Angle holder

Ceiling Rose

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Electric Socket and Plug cover

Plug with 3 pins

Colour Codes

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Iron Clad Main Switch

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MCBs

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Basic Electrical Safety at House

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The common flat-pin 13 Amp plus is suitable for appliances with a

loading of up to 2.9 kW and this covers most of the commonly used

non-fixedappliances in the home heaters, washing machine, dryer,microwave, tools, entertainment equipment, etc. Continental type 16

Amp plugs may be used with appliances up to 3.6 kW Loading.

Generally in it may also be associated with an older wiring installation.

In general it is wise to use the 2.9 kW loading as the maximum for

portable appliances.

Appliances with a loading greater than 2.9 kW should be permanently

connected through a switch to their own circuit. In some cases

manufacturers may recommend this practice even where the loading isbelow this

figure.

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Using Appliances Safely

Fixed appliances

Fixed appliances such as a cooker, water heater, storage heater, electricshower as well as any appliance rated above 3.6 kW must be

permanently wired through a switched outlet; they must not be

connected through a plug and socket. If you are buying an electric

cooker other than the small portable plug-in type check beforehand

with a competent authority or an expert that your electricity connection

is adequate for the load. Remember that an electric cooker requires a

separate control unit (double-pole isolating switch) and heavier wiring

than that used for socket outlets. This also applies to instantaneous

electric showers.

N.B. Heavily loaded equipment on farms such as welders, milking

machines, coolers and

pumps have special requirements

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Expansion Indian Standards

Institute(Bureau of Indian

Standardssince Jan 1 1987)

Certifying agency Bureau of Indian Standards

Effective region India

Effective since 1955

Product category Industrial products

Legal status Mandatory for 90 products

(Feb 2013), voluntary forothers

http://en.wikipedia.org/wiki/Bureau_of_Indian_Standardshttp://en.wikipedia.org/wiki/Bureau_of_Indian_Standardshttp://en.wikipedia.org/wiki/Indiahttp://en.wikipedia.org/wiki/Indiahttp://en.wikipedia.org/wiki/Bureau_of_Indian_Standards

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(India)

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Industrial Safety

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