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Conductor Stranding Constructions

Different Types of Conductor Strandings

  

Bunch Stranding Unidirectional Concentric Unilay Stranding
Conductor Bunch Stranding Unidirectional Concentric Unilay Stranding
Rope Stranding Concentric Equilay Stranding
Conductor Rope Stranding Concentric Equilay Stranding

 

 

Bunch Stranding: This type of stranding has any number of strands bunched together and twisted in the same direction. This is a reliable construction but doesn't have as high-quality extrusion as other constructions. This method is the lowest costing or cheapest type of stranding that's currently available. 

A similar construction called smooth bunch stranding has helped solve major issues by arranging the strands in a geometric configuration.

Unidirectional Concentric: This stranding configuration has multiple layers of helically laid strands with the same direction of lay. The lay lengths also increase with every succeeding layer. 
Unilay: This stranding configuration has multiple layers of helically laid strands with the same direction of lay. This stranding also has the same lay length as all succeeding layer. 
True Concentric: A single central strand that is surrounded by layers of helically laid strands. Every layer has a reversed lay direction with increasing lay lengths every succeeding layer. 
Equilay: A single central strand that is surrounded by layers of helically laid strands. Every layer has a reversed lay direction with the same lay lengths every layer. 
Rope: A rope standing is any type of stranding (Bunch, Unicentric, etc.) grounded into a large cable. This construction is used in order to create a very flexible conductor.