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  Enamelled Wire

Introduction to Enamelled Wire:

A wire coated with an extremely thin insulating layer is termed as enamelled wire. The core material ('wire') is copper or aluminum, coated by a thin layer of a polyurethane, polyamide, or polyester resin - termed as "enamel".

The insulation's thin layer coated on Enamelled wire avoids the wire surfaces from being in a short circuit while wound into coils. It is employed chiefly in the construction of electromagnets, motors, transformers and inductors. For effortlessness of manufacturing inductive components such as transformers and inductors, mainly new enamelled wire has enamel that works like a flux while burnt during soldering. The meaning of this is that the electrical connections at the ends can be ready without stripping off the insulation first. Older enamelled copper wires generally needs sandpapering or scraping to remove the insulation before soldering.

Enamelled wires are categorized through their diameter (as SWG number) or area, temperature class and insulation class. Enamelled wires are manufactured in both rectangular shapes and round shapes. Rectangular wire is employed in larger machine windings to make the very efficient use of presented winding space.

Breakdown voltage relies on the thickness of the covering that can be of 3 types: Grade 1, Grade 2 and Grade 3. Higher grades comprise thicker insulation and so higher breakdown voltages. The temperature class points out the temperature of the wire on which it can comprise a 20,000 hour service life. At lesser temperatures the wire's service life is longer (about a factor 2 for each 10 °C lower temperature). General temperature classes are 120, 155 and 180 °C.

Table Standard wire gauge and equivalent sizes in mm and inch.

 

S. W. G. Gauge No.

Standard Wire Gauge S. W. G.

 

S. W. G. Gauge No.

Standard Wire Gauge S. W. G.


Inch


mm

Area

mm2


Inch


mm

Area

mm2

0

0.324

8.230

53.17

26

0.018

0.457

0.164

1

0.300

7.620

45.6

27

0.016

0.417

0.136

2

0.276

7.010

38.6

28

0.015

0.376

0.111

3

0.252

6.401

32.2

29

0.014

0.345

0.0937

4

0.232

5.893

27.3

30

0.012

0.315

0.0779

5

0.212

5.385

22.8

31

0.012

0.295

0.0682

6

0.192

4.877

18.7

32

0.011

0.274

0.0591

7

0.176

4.470

15.7

33

0.010

0.254

0.0507

8

0.160

4.064

13.0

34

0.009

0.234

0.0429

9

0.144

3.658

10.5

35

0.008

0.213

0.0357

        10

0.128

3.251

 8.3

36

0.008

0.193

0.0293

        11

0.116

2.946

6.82

37

0.007

0.173

0.0234

        12

0.104

2.642

5.48

38

0.006

0.152

0.0182

        13

0.092

2.337

4.29

39

0.005

0.132

0.0137

        14

0.080

2.032

3.24

40

0.005

0.122

0.0117

        15

0.072

1.829

2.63

41

0.004

0.112

0.0098

        16

0.064

1.626

2.07

42

0.004

0.102

0.0082

        17

0.056

1.422

1.59

43

0.004

0.091

0.0065

        18

0.048

1.219

1.17

44

0.003

0.081

0.0636

        19

0.040

1.016

0.811

45

0.003

0.071

0.0557

        20

0.036

0.914

0.657

46

0.002

0.061

0.0479

        21

0.032

0.813

0.519

47

0.002

0.051

0.0400

        22

0.028

0.711

0.397

48

0.002

0.041

0.0322

        23

0.024

0.610

0.292

49

0.001

0.030

0.0236

        24

0.022

0.559

0.245

50

0.001

0.025

0.0196

        25

0.020

0.508

0.203

BASIS : IS 13730-0-1/IEC 317-0-1

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