Copper products: Bunches

Definition

Several single wires or bundles are bunched together. Those single wires do not hold a fixed position inside the strand. Their position relative to one another undergoes a permanent change along the entire length of the bunch.


Applications

  • A multitude of applications in cables and conductors
  • Crucial advantage: good efficiency

Particular benefits for our customers

  • Uniform elongation of single wires
  • Low tolerances, even in single wires (even outperforming ASTM)

Manufacturing range


Construction

The construction of a bunch is derived from the cross-section required, which leads to the electrical conductor featuring a certain resistance level. Different cross-sections with the same resistance value can be generated by applying single wires of varying sizes.

Calculator for medium-sized bunches

Bunch diameter 1,00 mm


Calculation of the diameter of a medium-sized bunch

D = d × f

D = diameter of medium-sized bunch
d = diameter of single wire
f = factor, see table
n = no. of wires to determine factor f

Example

n = 16
d = 0.20 mm
f = 4.7

Bunch 16 × 0.20 mm (= 0.50 mm²)

D = 0.20 mm × 4.7
D = 0.94 mm

Number of wires (n) Factor (f)
1 1
2 2
3 2.15
4 2.41
5 2.7
7 3
10 4
12 4.15
14 4.41
16 4.7
19 5
24 6
26/27 6.15
28/30 6.41
31/32/33 6.7
Number of wires (n) Factor (f)
37 7
44 8
48 8.15
52 8.41
56 8.7
61 9
70 10
75 10.15
80 10.41
85 10.7
91 11
102 12
108 12.15
114 12.41
120 12.7

Packaging

Reel sizes from 80 mm (1 kg) to 630 mm (400 kg), subject to diameter

Packaging information

“No pollutants” policy

All materials we use to make single wire are absolutely compliant with RoHS, thus corresponding to EG regulation 2011/65/EU. (See article “Cadmium – end of the line”).

In response to inquiries made, we can confirm that our products do not contain any minerals that originate from regions of conflict. They are in full accordance with the American Dodd-Frank-Act.

Contact

Other diameters and materials upon request may be found.

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