Copper Transformer Riser Wire

Copper Transformer Riser Wire. Black Polyethylene Covered. Solid or Stranded Soft Drawn Copper Conductor.

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Used on transformers as connection between line conductor and transformer primary bushing in applications where protection from momentary contact from wildlife is needed. Although not treated as an insulation, the covering on transformer riser wire does provide an increased level of protection from momentary grounded contacts caused by wildlife, excessive wind and tree limbs or other grounded objects in the proximity of the high voltage lead. May be used on distribution system voltages up to 35kV line-to-line.


Select a set of products below for more information:
Conductor Ground Wire
No. of Conductors Size (AWG or kcmil) (mm2) No. of Strands Insulation Thickness (mils) (mm) Size (AWG) No. of Strands Nom. OD (mils) (mm) Nominal Total Weight (lbs/1000') (kgs/km) Allowable Ampacity
0 0
1 1
477 12.13
252 375

Standards & References

Southwire’s transformer riser wire meets or exceeds the following ASTM specifications:

  • B 3 Soft or Annealed Copper Wire
  • B 8 Concentric-Lay-Stranded Copper Conductors, Hard, Medium-Hard, or Soft.


Conductors are solid soft drawn copper. The covering is high molecular weight polyethylene, black.


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