Knuckling

As knuckling a cable fault is indicated, in which the copper conductors of a submarine cable through the wire insulation suppressed. During laying, the submarine cable under tension is untwisted through the armouring . The insulated cable core is also extended. When the tensile force decreases and the elongation decreases, the copper conductor , which is stressed beyond its elastic limit , is pressed through the insulation in the shape of a knee. This defect, which is rarely observed with gutta-percha cables, initially occurred when using polyethylene (PE) .

The error can be prevented by using high molecular weight polyethylene and a suitable structure of the inner conductor .

See also

• Cable fault localisation
• Cable layers

literature

• H. Horn: Mechanical problems with deep sea cables, F & G-Rundschau, issue 39 from 1955; P. 300
• Handheld dictionary of electrical telecommunications ; Volume 2 G-P; P. 960