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3C Type Cable Joint Box

A 3C cable joint box is designed to safely connect and insulate three-core power cables, available in heat shrink, cold shrink, resin-filled, or hybrid types for medium and high voltage applications.

Overview

A 3-core cable joint box is used to join three-core (3C) power cables, typically for medium voltage (MV) or high voltage (HV) systems. It ensures electrical insulation, mechanical protection, and environmental sealing for the cable joint, preventing moisture ingress, electrical faults, and mechanical damage. These boxes are suitable for copper or aluminium conductors and can be used with XLPE, EPR, or PILC insulated cables.

Types of 3-Core Cable Joint BoxesHeat Shrink JointsUse heat-activated shrink tubes to insulate and seal the joint. Suitable for 16–300 sqmm 3-core XLPE cables at voltages up to 33kV. Can be used for armoured and unarmoured cables, including industrial, marine, and offshore applications.

Cold Shrink Joints

Use pre-stretched, elastic tubes that shrink onto the cable when the inner support is removed. Provide moisture-tight, flexible insulation and adapt to temperature variations. Often include mechanical connectors, stress control elements, and outer jackets for complete protection.

Resin-

Filled Joints

Contain two-part resin that encapsulates the joint, providing high impact strength and water resistance. Suitable for 11kV and similar MV applications, compatible with both XLPE and PILC cables. Include mechanical connectors and earth fault screening for safety.

Hybrid Joints

Combine cold shrink inner insulation with heat shrink or resin outer jackets. Offer enhanced stress control, flexibility, and environmental protection.

Key Features

Voltage Ratings: Typically 6. 6kV, 11kV, 17. 5kV, 24kV, and 33kV depending on cable type.

Conductor Compatibility: Copper or aluminium, stranded or solid. Installation Environments: Underground, overhead, in ducts, or exposed to outdoor conditions. Mechanical Protection: Includes connectors, stress control, and earth fault continuity modules.

Standards Compliance: Conforms to DIN VDE, BS6622, BS7870, IEC 61238, and other international standards.

Applications

Power distribution networks (urban and industrial)Substations and switchgear connectionsMarine and offshore power systemsCable repair and maintenance in underground or overhead installationsA 3C cable joint box ensures reliable, safe, and long-lasting connections for three-core power cables, with the choice of type depending on voltage, cable insulation, environmental conditions, and installation requirements.

3C Type Cable Joint Box

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Technical note

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