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 |