blog May 21, 2021

Conductor Size conversation (AWG/SWG into mm

In cable conductor strand dimension Unit is in mm but cross sectional area or conductor size is given into Sqmm (mm2), AWG (American wire gauges) & SWG (Standard wire gauges).

We can easily understand the conversion of SWG/AWG into mm & mm2 from given Table

Conductor Size Equivalents (Diameter)

SWG

B & S(AWG)

inches

0.324

8.23

0.3249

8.25

0.300

7.62

0.2893

7.35

0.276

7.01

0.2576

6.54

0.252

6.40

0.2294

5.83

0.232

5.89

0.2043

5.19

0.212

5.38

0.1819

4.62

0.192

4.88

0.1620

4.11

0.176

4.47

0.1443

3.67

0.160

4.06

0.1285

3.26

0.144

3.66

0.1144

2.91

0.128

3.25

0.1019

2.59

0.116

2.95

0.0907

2.3

0.104

2.64

0.0808

2.05

0.092

2.34

0.0720

1.83

0.080

2.03

0.0641

1.63

0.072

1.83

0.0571

1.45

0.064

1.63

0.0508

1.29

0.056

1.42

0.0453

1.15

0.048

1.22

0.0403

1.02

0.040

1.02

0.0359

0.912

0.036

0.914

0.0320

0.813

0.032

0.813

0.0285

0.724

0.028

0.711

0.0253

0.643

0.024

0.610

0.0226

0.574

0.022

0.559

0.0201

0.511

0.020

0.508

0.0179

0.455

0.018

0.457

0.0159

0.404

0.0164

0.417

0.0142

0.361

0.0148

0.376

0.0126

0.320

0.0136

0.345

0.0113

0.287

0.0124

0.315

0.0100

0.254

0.0116

0.295

0.0089

0.226

0.0108

0.274

0.0080

0.203

0.0100

0.254

0.0071

0.180

0.0092

0.234

0.0063

0.160

0.0084

0.213

0.0056

0.142

0.0076

0.193

0.0050

0.127

0.0068

0.173

0.0045

0.114

0.006

0.152

0.0040

0.102

0.0052

0.132

0.0035

0.089

0.0048

0.122

0.0031

0.079

0.0044

0.112

0.0028

0.071

0.0040

0.102

0.0025

0.064

0.0036

0.091

0.0022

0.056

0.0032

0.081

0.0020

0.051

0.0028

0.071

0.0018

0.046

0.0024

0.061

–

0.0020

0.051

–

0.0016

0.04

–

0.0012

0.030

–

0.0010

0.025

–

SWG = (BRITISH) STANDARD WIRE GAUGE
B & S = BROWN AND SHARPE
AWG = AMERICAN WIRE GAUGE

CSA (In mm2)= [0.785 x (D)^2 ] x No of Strands

E.g.1

For 20 AWG Size, CSA is 20 AWG = 0.81 mm
No of strand = 1
CSA = 0.785 X 0.81 X 0.81 X 1 = 0.51 Sqmm

E.g.2

For 3 X 22 SWG Size CSA is No of strand = 3
Size of each strand = 22 SWG 22 SWG = 0.71 mm
CSA = 0.785 X 0.71 X 0.71 X 3 = 1.19 Sqmm

In cable most popular used conductor sizes in AWG style is 26, 24, 22, 20, 18 & 16. These can be in solid & multi strand type.

In SWG Style : 3X22 SWG, 1 X 22 SWG, 1 X 30 SWG, 1 X 24 SWG

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