11/08/2026
: Medium Voltage cables with waterblocking layers - Longitudinal waterblocking, often in the form of swellable tapes and powders can help limit the capilliary action in the event of water ingress from the cable ends. The pressure inside the cable is such that it acts like a straw and will pull any water through the length of the cable. Radial waterblocking - an Aluminium laminate foil layer tightly bonded to the inside of the sheathing - is to protect the cable in the event of the sheath being compromised by a tear or piercing.
https://www.elandcables.com/electrical-cable-and-accessories/cables-by-type/medium-voltage-cable