Design of Joint
The joints are designed for MV screened, 1-core polymeric insulated cables with or without armour. The same design principles are used for 3-core cables.
1. Electrical stress control
Stress control tube, together with stress relief mastic, is used to smooth out the electrical field at the cable screen ends.
2.Insulation and screen
Heat shrink insulation tube delivers consistent insulation thickness to meet or exceed that of the cable.
Heat shrink semi-conductive / insulation dual layer tube is also adopted to help ensure a void-free interface between the insulation and screen.
3.Metallic shielding
Copper mesh wrapped around the joint area rebuilds the metalic screen. Either soldering or solderless earth connection is available to provide screen continuity across the joint.
4.Outer sealing and protection
The outer sealing and protection is performed by an adhesive coated heat shrink tube. It provides mechanical protection and chemical resistance as expected from cable oversheath.
