Bunching

Bunching

Bunched wires having cross sections from 0.055 to 300 mm2 are produced by bunching a certain number of single end wires with certain diameters.

Regular Bunch: In regular bunch construction the respective wires do not have a defined position in the bunch cross section, the surface is irregular and the diameter and roundness varies.

Concentric Bunched Conductors: They have cross sections from 0,055 to 300 mm2 and are produced by bunching a certain number of single end wires with certain diameters to obtain a defined geometric arrangement with smooth and regular surface.

Concentric Geometric Arrangement of Concentric Bunched Conductors :

Unilay Concentric: There is one or more layers of wires (1+6, 1+6+12... etc.) around one single wire at the center. Each wire layer has the same lay length and direction.

Unidirectional Concentric: Lay directions of layers are the same but lay lengths increase from center.

Equilay Concentric : Lay lengths of layers are the same but lay directions are different.

Conventional, True Concentric : Lay directions of layers are different and lay lengths increase from center.

Sample Table:

1st Layer

2nd Layer

1+6+12

LAY DIRECTION

LAY LENGTH

LAY DIRECTION

LAY LENGTH

DIAMETER

CONVENTIONAL CONCENTRIC

Z L1 S L1 5.00d

UNIDIRECTIONAL CONCENTRIC

S L1 S L1 5.00d

EQUILAY CONCENTRIC

Z L1=L2 S L1=L2 5.00d

UNILAY CONCENTRIC

S L1=L2 S L1=L2 4.86d

Smoothbunch Conductors:

Produced by bunching and compacting a certain number of wires having certain diameters to form a perfect circular shape and very small lay length. Example : 10, 16, 24, 26, 30, 32, 41, etc.

Standards: ASTM B174, ASTM B8, ASTM B286, EN 60228

Rope-lay Conductors :

Produced by bunching of bunched or stranded concentric conductors in the same or opposite direction to form a concentric conductor.

Standards: ASTM B172, ASTM B173, EN 60228

Sample Table:

TYPE

CENTER

1st Layer

2nd Layer

3rd Layer

1 6 12 18
1 Bunch S S S S
Rope - S S S
2 Bunch Z S Z S
Rope - S Z S
3 Bunch S Z S Z
Rope - S Z S
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