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Typical Applications
Utility transformers
Standard Construction
Individual strands are CDA11000 ETP copper magnet wire conforming to ASTM B-48-68. Each strand is insulated with heavy build Formvar polyvinyl formal) enamel insulation conforming to NEMA MW 18-C.
An outer covering of insulated tapes is applied over the transposed conductors to provide mechanical and dielelectric strength. These tapes are normally applied with a butt lap and are registered approximately 30% over the previous layer. The top two tapes are normally applied with a butt intercalated lap of 50%.
Standard Insulation is 0.003" (0.076 mm) thermally upgraded creped kraft paper.
Optional Construction
- Cold work hardened strands up to 26,000 psi (180 newton/mm2 ) 0.2% offset yield.
- Anneal resistand DCDA 11400 silver bearing copper strands (approximately 55,000 psi [380 newton/mm2] 0.2% offset yield).
- "B" staged epoxy coating over enamel insulation.
Optional Insulations
- Inner layers of 0.003" (0.076mm) thermally upgraded 60% hemp/40% kraft paper.
- Two outer layers of 0.003" (0.076 mm) thermally upgraded creped kraft paper.
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Design Limits (English)
| Individual Strands |
Soft ETP Copper |
Work Hardened |
Silver Bearing |
| Minimum Number |
5 |
5 |
5 |
| Maximum Number |
43 |
43 |
43 |
| Minimum Thickness |
0.040 |
0.040 |
0.040 |
| Maximum Thickness |
0.120 |
0.120 |
0.120 |
| Minimum Width |
0.120 |
0.120 |
0.120 |
| Maximum Width |
0.450 |
0.450 |
0.350 |
| Min Width/Thickness |
1.5 to 1 |
1.5 to 1 |
1.9 to 1 |
| Max Widn/Thickness |
6.5 to 1 |
5 to 1 |
5 to 1 |
Design Limits (Metric)
| Individual Strands |
Soft ETP Copper |
Work Hardened |
Silver Bearing |
| Minimum Number |
5 |
5 |
5 |
| Maximum Number |
43 |
43 |
43 |
| Minimum Thickness |
1.01 |
1.01 |
1.01 |
| Maximum Thickness |
3.05 |
3.05 |
3.05 |
| Minimum Width |
3.05 |
3.05 |
3.05 |
| Maximum Width |
11.43 |
11.43 |
8.89 |
| Min Width/Thickness |
1.5 to 1 |
1.5 to 1 |
1.9 to 1 |
| Max Widn/Thickness |
6.5 to 1 |
5 to 1 |
5 to 1 |
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