WIRE AND CABLE
WIRE AND CABLE
Parts of a Cable
1.
Conductor
2.
Insulator
3.
Outer Sheath
The construction
and material are determined of a cable by three main factors:
1.
Working Voltage determining the thickness of
the insulation.
2.
Current Carrying capacity determining the
cross-sectional size of the conductor(s).
Environmental
Conditions such as temperature,
water, chemical of sunlight exposure, and mechanical impact, determining the
form and composition of the outer cable jacket.
Types of Conductor:
1.
Solid
2.
Stranded – Circular round Conductor
3.
Stranded – Circular Compacted conductor
4.
Stranded – Sector shaped conductor
5.
Flexible conductor
Extra-flexible conductor
Conductor Size
Metric
Size:
You know that Triangle Rectangle Circle and Square are shapes.
In a square the length and width are equal
Given;
Length = 2mm
Width = 2mm
Here;
=
4 mm X 4 mm = 4mm²
in the cable conductor size we consider square at the center of conductor.
Therefore cable size are 1.5 mm², 2.5 mm², 4 mm² or 6 mmsq
STANDARD WIRE SIZE
S. N0.
|
IMPERIAL
SIZE
|
METRIC
SIZE mm²
|
||
1
|
1/0.044”
|
1
mm²
|
||
2
|
3/0.029”
|
1.5
mm²
|
||
3
|
7/0.029”
|
2.5
mm²
|
||
4
|
7/0.036”
|
4
mm²
|
||
5
|
7/0.044”
|
6
mm²
|
||
6
|
7/0.052”
|
10
mm²
|
||
7
|
7/0.064”
|
16
mm²
|
||
8
|
19/0.052”
|
25
mm²
|
||
9
|
19/0.064”
|
35
mm²
|
||
10
|
19/0.072”
|
50
mm²
|
||
11
|
19/0.083”
|
70
mm²
|
||
12
|
37/0.072”
|
95
mm²
|
||
13
|
37/0.083”
|
120
mm²
|
||
14
|
37/0.093”
|
150
mm²
|
||
15
|
37/0.103”
|
185
mm²
|
||
16
|
61/0.093”
|
240
mm²
|
||
STANDARD FLEXIBLE
WIRE SIZE
S. No.
|
IMPERIAL
SIZE
|
METRIC
SIZE mm²
|
||
1
|
14/0.076”
|
0.5 mm²
|
||
2
|
23/0.076”
|
0.75 mm²
|
||
3
|
40/0.076”
|
1 mm²
|
||
4
|
70/0.076”
|
1.5 mm²
|
||
5
|
110/0.076”
|
2.5 mm²
|
||
6
|
162/0.076”
|
4 mm²
|
||
Page No. 12
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