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We have a wonderful technical suport team at HSM Wire International, Inc.
Typically, the design engineer requiring the use of Litz knows the operating frequency and RMS current required for his application. Since the primary benefit of a Litz conductor is the reduction of AC losses, the first consideration in any Litz design is the operating frequency. The operating frequency not only influences the actual Litz construction, it also determines the individual wire gauge.
Ratios of alternating current resistance to direct current resistance for an insulated solid round wire (S) in terms of a value (X) are shown below:
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Table A
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X |
0 |
0.5 |
0.6 |
0.7 |
0.8 |
0.9 |
1.0 |
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S |
1.0000 |
1.0003 |
1.0007 |
1.0012 |
1.0021 |
1.0034 |
1.0050 |
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The value of X for copper wire is determined by the following formula:
M = Wire diameter in mils
To see the rest of the calucation click on Litz Designing Calculations
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The following table shows recommended frequency VS. wire gauges:
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Table B
FREQUENCY |
RECOMMENDED WIRE GAUGE |
NOMINAL DIA.OVER COPPER |
DC RES.OHMS/M'
(MAX) |
SINGLE STRAND "S"
Rac Rdc |
60 HZ to 1 KHZ |
28 AWG |
.0126 |
66.37 |
1.0000 |
1 KHZ to 10 KHZ |
30 AWG |
.0100 |
105.82 |
1.0000 |
10 KHZ to 20 KHZ |
33 AWG |
.0071 |
211.70 |
1.0000 |
20 KHz to 50 KHZ |
36 AWG |
.0050 |
431.90 |
1.0000 |
50 KHZ to 100 KHZ |
38 AWG |
.0040 |
681.90 |
1.0000 |
100 KHZ TO 200 KHZ |
40 AWG |
.0031 |
1152.30 |
1.0000 |
200 KHZ TO 350 KHZ |
42 AWG |
.0025 |
1801.0 |
1.0000 |
350 KHZ TO 850 KHZ |
44 AWG |
.0020 |
2873.0 |
1.0003 |
850 KHZ TO 1.4 MHZ |
46 AWG |
.0016 |
4544.0 |
1.0003 |
1.4 MHZ TO 2.8 MHZ |
48 AWG |
.0012 |
7285.0 |
1.0003 |
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In memory of Allen Richter, engineer, whose dedication and refined technical expertise richly served the electronics industry. His life's work with Kerrigan Lewis greatly contributed to the technological advances made by the Litz-wire industry. |
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- American Spool Configurations
- Southeast Asia Spool Configurations
- European Spool Configurations
- Packaging Reference Guide
- Metallurgy of Copper Wire
- Resistance Dielectric Data / NEMA
- Minimum Breakdown Voltage / IEC
- Ohm's Law
- Single Strand Diameter Calculation
- Formula for the OD of Standard Litz Wire Configurations
- Permissible Minimum Bending Radius
- Metric Conversion Factors
- Conversions of Fractions to Inches and mm
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- Standard Wire Gauge Chart
- ISO Metric Wire Gauge Chart
- Lineal Measure Conversion Chart
- Fractional/Decimal Conversion Chart
- Frequency Chart
- Dimensions of Enameled Wire
- AWG to Metric Conversion Chart *
- AWG to Circular Mil Area Conversion Chart
- Multi-Strand Diameter Calculation
- International Abbreviations
- Glossary of Terms Wiring Industry
- Metal Formula Guide
- CAS Registry Numbers
- Melting Temperatures for Common Metals
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