Wooden casing and caping wiring

Wooden casing capping wiring 

1 This is one of cheapest types of wiring and is commonly used for house wiring.

2 The cable used in this

    type of wiring is either 

    V.I.R or P.V.C or any

   other approved insulated   

   cables.

Advantages

1 Better appearance than cleat wiring. 

2 Cheap in cost.

3 Easy to install and rewire. 

Disadvantages 

1 Not suitable in damp places. 

2 Risk of fire 

3 This type of wiring can be used only on surface and cannot be concealed in plaster. 

4 Since it requires better workmanship labour cost is more. 

Application 

This type of wiring is suitable where acids and alkalis are likely to be prescut. 

Cleat wiring system

Cleat wiring 

1 Cleat wiring is normally used for temporary wiring purposes. 

2 As a permanent system of wiring it is not preferred in domestic premises.

3 It is quite suitable for taking a temporary connection such as for function marriages etc.

Advantages

1 It is the cheapest system of internal wiring. 

2 Its installation and dismantment is easy and quick. 

Disadvantages 

1 It is not good looking. 

2 It is quite temporary and perishes quickly. 

Application 

1 The wiring of this type is very  suitable for temporary installation in dry places. 

2 This is also accepted where appearance is not so important and cheapness is the main consideration. 

Wiring System and classification

Wiring system :

1 Cleat wiring system 

2 Wooden casing capping wiring system 

3 CTS or TRS wiring system 

4 Lead sheathed or metal sheated wiring system 

5 Conduit wiring system 

Wires & types of wire

Wire & types of wire 

Wire Material: 

1 Copper 

2 Aluminum 

Insulation of wire:

1   VIR: Vulcanised  Indian rubber 

2  TRS: Tough Rubber Sheath

3  PVC: poly vinyl chloride 

4  paper 

5  Enemel

6  Cotton

Size of wire:

0.75mm sq 

1 mm

1.5mm

2mm

2.5mm

4sqmm 

After 4 sq mm cable size start 

Core of wire : 

1 2 core

2 3 core

3 4 core 

Syllabus of IMEE

1  Wire & types of wires

2 Wiring system & Classsification

3 Load Calculations 

4 Wiring Material 

5 Types of switches & protection (MCB) 

6 Conductor size calculations 

7 Insulation Testing 

8 illumination

9 Earthing and types of earthing 

Principle of Homogeneity of dimensions

This principle states that

In a dimensionaly correct physical relation the dimension of each and every term on both sides of relation must be same.

 That is according to this principle;

1 We can add or subtract only those physical quantities which has same nature ( mean if they have same dimensions).

2 A physical relation must be dimensionaly homogeneous i.e. all the term on both sides of the relation must have the same dimensions. 

Dimensional Equation

An equation which indicates the relation between thr fundamental units of mass, length and time with their power and the derived units is called dimensional equation.