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 and 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.
  • Nomex covered and paperless CTC.

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.

Design Limits (English)
 

Individual Strands Soft ETP Copper Work Hardened Silver Bearing
 Minimum Number  5  5
 Maximum Number 79 79 79
 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  0.490  0.490  0.358
 Min Width/Thickness  1.5 to 1  1.5 to 1  1.9 to 1
 Max Widn/Thickness  7.0 to 1  7.0 to 1  6.5 to 1

 

Design Limits (Metric)


Individual Strands Soft ETP Copper Work Hardened Silver Bearing
 Minimum Number 5 5
 Maximum Number 79 79 79
 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 12.5 12.5 8.89
 Min Width/Thickness  1.5 to 1  1.5 to 1  1.9 to 1
 Max Widn/Thickness  7.0 to 1  7.0 to 1  6.5 to 1

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