Solderable polyurethane enamelled round copper wire, class 155, is a self-fluxing enamelled copper wire of thermal performance class F. The most outstanding characteristic of this wire is the possibilty of having an efficient and safe contact of the wire ends by fast and easy solderability with a solder bath temperature from 390 °C upwards without prior mechanical removal of the insulation film.This type of enamelled copper wire fulfills the requirements of modern winding technology. Solderable polyurethane enamelled round copper wire can be easily welded and mechanically connected. Sophisticated process technology and process setting ensure easy mouldability, best elongation plus constant and good insulation characteristics of these wires.
Performance Features:
Very good direct solderability and insulation. It has high thermal properties and good resistance to high frequency. Good result in humidity – resistance performance and performance in high speed winding.
Application:
Small transformers, timers, relays, small motors, solenoids, clock coils, watch coils, ignition coil, magnetic heads, instruments, household appliances and electronic equipments, etc.
The following is the content of the IEC standard:
Reference Standards: IEC-60317. Specifications for particular types of winding wires – Part 20: Solderable polyurethane enamelled round copper wire, class 155.
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes International Standards for all electrical, electronic and related technologies.
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Introduction
This part of IEC 60317 is one of a series which deals with insulated wires used for windings in electrical equipment. The series has three groups describing:
1) Winding wires – Test methods (IEC 60851);
2) Specifications for particular types of winding wires (IEC 60317);
3) Packaging of winding wires (IEC 60264).
1 Scope
This part of IEC 60317 specifies the requirements of solderable enamelled round copper winding wire of class 155 with a sole coating based on polyurethane resin, which may be modified providing it retains the chemical identity of the original resin and meets all specified wire requirements.
NOTE A modified resin is a resin that has undergone a chemical change, or contains one or more additives to enhance certain performance or application characteristics.
The range of nominal conductor diameters covered by this standard is:
Grade 1: 0,018 mm up to and including 0,800 mm;
Grade 2: 0,020 mm up to and including 0,800 mm.
The nominal conductor diameters are specified in Clause 4 of IEC 60317-0-1:2013.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
IEC 60317-0-1:2013, Specifications for particular types of winding wires – Part 0-1: General requirements – Enamelled round copper wire
3 Terms, definitions, general notes and appearance
3.1 Terms and definitions: Subclause 3.1 of IEC 60317-0-1:2013 applies.
3.2 General notes
Methods of test: Subclause 3.2.1 of IEC 60317-0-1:2013 applies. In case of inconsistencies between IEC 60317-0-1:2013 and this part of IEC 60317, the latter shall prevail.
Winding wire: Class 155 is a thermal class that requires a minimum temperature index of 155 and a heat shock temperature of at least 175 °C. The temperature in degrees Celsius corresponding to the temperature index is not necessarily that at which it is recommended that the wire be operated and this will depend on many factors, including the type of equipment involved.
3.3 Appearance: Subclause 3.3 of IEC 60317-0-1:2013 applies.
4 Dimensions: Clause 4 of IEC 60317-0-1:2013 applies.
The international standard IEC-60317-0-1 defines the preferred diameters of round enamelled wire as following the R20 series (20 sizes per decade). If intermediate values are required for technical reasons then they should follow the R40 series. “Increase” denotes the difference between the outer and inner diameters.
5 Electrical resistance: Clause 5 of IEC 60317-0-1:2013 applies.
6 Elongation: Clause 6 of IEC 60317-0-1:2013 applies.
7 Springiness: Clause 7 of IEC 60317-0-1:2013 applies.
8 Flexibility and adherence: Clause 8 of IEC 60317-0-1:2013 applies.
9 Heat shock: Clause 9 of IEC 60317-0-1:2013 applies. The minimum heat shock temperature shall be 175 °C.
10 Cut-through: No failure shall occur within 2 min at 200 °C.
11 Resistance to abrasion (nominal conductor diameters from 0,250mm up to and including 0,800mm.
The wire shall meet the requirements given in Table 1.
For intermediate nominal conductor diameters, the value of the next larger nominal conductor diameter shall be taken.
| Table 1 – Resistance to abrasion |
| Nominal conductor diameter
mm |
Grade 1 |
Grade 2 |
Minimum average force to failure
N |
Minimum force to failure of each measurement
N |
Minimum average force to failure
N |
Minimum force to failure of each measurement
N |
0,250
0,280
0,315
0,355
0,4000,450
0,500
0,560
0,630
0,7100,800 |
2,30
2,50
2,70
2,90
3,153,40
3,65
3,90
4,20
4,504,80 |
1,95
2,10
2,30
2,50
2,702,90
3,10
3,30
3,55
3,804,10 |
4,10
4,40
4,75
5,10
5,455,80
6,20
6,65
7,10
7,608,10 |
3,50
3,70
4,00
4,30
4,604,90
5,25
5,60
6,00
6,456,90 |
12 Resistance to solvents: Clause 12 of IEC 60317-0-1:2013 applies.
13 Breakdown voltage: Clause 13 of IEC 60317-0-1:2013 applies. The elevated temperature shall be 155 °C.
14 Continuity of insulation : Clause 14 of IEC 60317-0-1:2013 applies.
15 Temperature index: Clause 15 of IEC 60317-0-1:2013 applies. The minimum temperature index shall be 155.
16 Resistance to refrigerants: Test inappropriate.
17 Solderability
17.1 Nominal conductor diameters up to and including 0,100 mm
The temperature of the solder bath shall be (390 ± 5) °C. The maximum immersion time shall be 2s.
17.2 Nominal conductor diameters over 0,100 mm
The temperature of the solder bath shall be (390 ± 5) °C. The maximum immersion time
(in seconds) shall be the following multiple of the nominal conductor diameter (in millimetres)
with a minimum of 2s. Grade 1: 8 s/mm; Grade 2: 12 s/mm. The surface of the tinned wire shall be smooth and free from holes and enamel residues.
18 Heat or solvent bonding: Test inappropriate.
19 Dielectric dissipation factor: Test to be agreed between purchaser and supplier.
20 Resistance to transformer oil: Test inappropriate.
21 Loss of mass: Test inappropriate.
23 Pin hole test: Clause 23 of IEC 60317-0-1:2013 applies.
30 Packaging: Clause 30 of IEC 60317-0-1:2013 applies.
