Bunches

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

  • Materials: Cu-ETP1 and Cu-OF1
  • Bare, tin-plated, nickel-plated or silver-plated
  • Left-hand lay or right-hand lay
  • Variation: soft annealed
  • Single-wire diameter: ranging from Ø 0.05 mm to Ø 0.51 mm
  • Cross-section: ranging from 0.005 mm2 to 630 mm2

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.

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

Numbers of wire (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
Numbers of wire (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