Stress control tubing is an essential component in medium and high voltage cable jointing kits and terminations. Its primary purpose is to manage and evenly distribute electrical stress at points where the cable insulation is cut or interrupted—typically at joints and terminations. Without proper stress control, concentrated electrical stress at these points can lead to premature insulation breakdown, partial discharges, and eventual failure of the cable system.

Why Stress Control Is Needed

In medium and high voltage systems (typically above 3.3 kV), the electric field is not uniformly distributed along the cable, especially where the insulation ends—such as at terminations or splices. This leads to high stress concentrations that can damage the insulation and reduce service life.

Stress control tubing solves this problem by redistributing and reducing the electric field intensity, creating a smooth transition from the conductor to the insulated cable body.

Key Features

• Heat Shrinkable: Shrinks tightly over the cable when heat is applied, ensuring a snug fit and good contact with the insulation.
• Semi-Conductive or High-Resistivity Material: Provides controlled electrical conductivity to manage the stress field.
• Easy to Install: Simple installation with heat gun or torch; conforms to cable contours.
• High Dielectric Strength: Maintains insulation integrity under high-voltage conditions.
• Thermal Stability: Withstands heat generated by power losses and environmental conditions.