RAYCHEM 11KV 3C*35SQMM STRAIGHT THROUGH JOINT

A Raychem 11kV 3C*35sqmm straight through joint kit is a comprehensive set of materials used to create a permanent, reliable, and sealed connection between two ends of a medium-voltage electrical cable. This specific kit is designed for underground or ducted applications where cables need to be joined in a continuous, straight line.

Here is a detailed breakdown of the terminology:

• Raychem: This is a leading brand, now under TE Connectivity, renowned for its expertise in materials science and particularly for its heat-shrink technology. Raychem products are known for their high quality and reliability in demanding electrical applications.

• 11kV (11,000 Volts): This indicates the voltage rating of the kit. It is designed to be used on electrical networks with a nominal voltage of 11 kilovolts, which is a common medium-voltage distribution level in many parts of the world, including India.

• 3C * 35sqmm: This specifies the type and size of the cable for which the kit is intended.

  • 3C stands for 3-Core, meaning the cable contains three separate electrical conductors.

  • 35sqmm ($35{\text{ mm}}^2$) refers to the cross-sectional area of each of the three conductors within the cable. This dimension is crucial as it determines the current-carrying capacity of the cable.

• Straight Through Joint: This describes the function of the kit. It is used to connect two pieces of the same type of cable end-to-end to create a continuous length. This is distinct from other types of joints like branch or "T" joints, which are used to create a tap-off from a main cable.

Purpose and Application

These jointing kits are essential for:

• Repairing damaged sections of underground cables.

• Extending existing cable runs when new connections or network expansions are required.

• Joining two different lengths of cable during the initial installation of an electrical distribution network.

The primary goal of the joint is to replicate the original cable's electrical and mechanical properties, ensuring a seamless and safe flow of electricity. This includes restoring the conductor's continuity, insulation, metallic shielding, and outer protective sheath.

Key Features and Components

A typical Raychem 11kV heat-shrink jointing kit contains a variety of engineered components, including:

• Heat-Shrinkable Tubing: These are the core components of the kit. They are made of cross-linked polymers that shrink tightly when heated.

  • Stress Control Tubing: A critical component in medium-voltage applications, this tubing is applied at the point where the cable's semi-conductive screen is cut back. It smooths the electrical field, preventing high-stress points that could lead to insulation failure.

  • Insulating Tubing: Thick-walled tubing that provides the primary electrical insulation over the connected conductors, designed to withstand the 11kV voltage.

  • Dual-Wall Sealing Tubing: This tubing has an outer insulating layer and an inner adhesive lining. When heated, the outer wall shrinks, and the inner lining melts and flows, creating a robust, moisture-proof seal that protects the joint from the external environment.

• Conductor Connectors (Ferrules): High-quality aluminum or copper crimp connectors are included to mechanically join the 35sqmm conductors of the two cables.

• Metallic Shielding Continuity: Tinned copper mesh or braid is provided to reconnect the cable's metallic screen across the joint, ensuring a continuous path for fault currents and maintaining electrical safety.

• Cleaning and Preparation Materials: The kit includes abrasive strips and solvent-impregnated wipes to properly clean and prepare the cable surfaces before applying the heat-shrink components. This is crucial for achieving a void-free and reliable joint.

• Installation Instructions: Detailed, step-by-step instructions are provided to guide a trained cable jointer through the correct installation procedure.