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.
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
0.295
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
36
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
0.122
0.0117
15
0.072
1.829
2.63
41
0.004
0.112
0.0098
16
0.064
1.626
2.07
42
0.102
0.0082
17
0.056
1.422
1.59
43
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
0.071
0.0557
20
0.036
0.914
0.657
46
0.002
0.061
0.0479
21
0.032
0.813
0.519
47
0.051
0.0400
22
0.028
0.711
0.397
48
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
0.025
0.0196
25
0.020
0.508
0.203
BASIS : IS 13730-0-1/IEC 317-0-1
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