A straight-through joint kit is used to splice/joint two 11 kV 3-core cables (with conductor size ~ 300 sq mm) so that the joint behaves electrically and mechanically like a continuous cable. This is commonly needed when you want to extend cable length, repair a damaged cable section, or connect cable runs in underground ducts / cable trenches. pvsmart.in+2parkerelectronics.in+2
It is suitable for polymeric-insulated (XLPE / EPR / similar) 3-core cables of 300 sq mm size used in medium-voltage distribution networks. ETS Cable Components+2Micraa+2
The straight-through means the cores remain in-line (i.e. cable-in to cable-out), not branching or termination so its ideal for underground, ducted or direct-buried cable splices where through-continuity is required. Axis India+1
A standard heat-shrink (or cold-shrink) 11 kV straight-through joint kit for 3C 300 sq mm will typically include the following: pvsmart.in+3parkerelectronics.in+3MSEDCL+3
| Component / Material | Purpose / Function |
|---|---|
| Stress-control tubing & mastic (one per core) | To control and smooth the electric stress at the cut-end of conductor insulation and joint connector avoiding partial discharge or insulation breakdown at joint. Axis India+1 |
| Heat-shrink (or cold-shrink) insulating / semiconducting tubing per core | To re-insulate each core and re-establish the cables insulation & screening layers over the join. parkerelectronics.in+2Electric Powertek Company Ltd.+2 |
| Tinned-copper mesh / copper braid / copper shielding wrap | To restore the metallic screen/shield continuity across the joint vital for screened / armoured cables for grounding and shielding. parkerelectronics.in+2Bharat Heavy Electricals Limited+2 |
| Outer protective jacket / abrasion-resistant outer sleeve / outer heat-shrink jacket (or cold-shrink sheath) | Provides mechanical protection, moisture-proofing, environmental sealing suitable for underground / duct / buried installations. parkerelectronics.in+2Electric Powertek Company Ltd.+2 |
| Connectors / mechanical lugs / compression or crimped connectors compatible with 300 sq mm conductor | To join the conductors of both cables securely, ensuring electrical continuity and mechanical strength. Bharat Heavy Electricals Limited+2pvsmart.in+2 |
| Sealing materials, mastic / adhesive liners (if using heat-shrink), tapes, installation accessories | Ensure void-free sealing, water-tightness, and long-term joint integrity against moisture, dust, soil, etc. Axis India+2pvsmart.in+2 |
| Installation instructions & marking / batch-numbered sleeves | For correct installation, traceability, and compliance with standards. Bharat Heavy Electricals Limited+1 |
Many kits are designed so that after proper application (heat-shrinking or cold-shrink depending on kit), the joint becomes as close as possible to original cable in insulation thickness, dielectric performance, mechanical strength, and environmental sealing. parkerelectronics.in+2pvsmart.in+2
Voltage compatibility: Rated for 11 kV cables suitable for medium-voltage distribution networks, underground cable systems, industrial and utility supply. pvsmart.in+1
Cable size support: Supports 3-core 300 sq mm (and often a range, e.g. 240 300 or 240 400 sq mm depending on kit) matching common cable specs used in MV networks. ETS Cable Components+2zamcables.com+2
Full insulation & shielding restoration: Stress-control layers + insulation + metallic screen / shield continuity via copper braid/mesh restore full electrical integrity essential for safety and performance. parkerelectronics.in+2Axis India+2
Moisture and mechanical protection: Outer jacket / sheath + sealing materials make the joint resistant to moisture ingress, soil, abrasion important for underground or duct installations. parkerelectronics.in+2pvsmart.in+2
Ease of installation (with correct technique): Heat-shrink (or cold-shrink) sleeves and modular components simplify installation compared to old-style mastic or resin joints; reduces workmanship errors. Axis India+2buyelectric.com+2
Flexibility: Suitable for both new installations and repair/splicing of existing cable runs useful in cable route extensions or maintenance. pvsmart.in+2Axis India+2
When specifying or installing a 11 kV 3C 300 sq mm Straight-Through Joint Kit, ensure:
The cable insulation type (XLPE / polymeric / screened) matches the kits design. Kits meant for XLPE / polymeric may not suit older PILC or other cable types. ETS Cable Components+2pvsmart.in+2
Use proper connectors / lugs sized for 300 sq mm conductor (copper or aluminium as per cable) to ensure current-carrying capacity and mechanical strength. Bharat Heavy Electricals Limited+1
Ensure the screen / armour continuity and earthing is properly restored using copper braid/mesh, earth-clamp, etc. This is essential for safety and fault-clearing. parkerelectronics.in+2Bharat Heavy Electricals Limited+2
Installation must follow correct procedure stress-tube placement, insulation, sealing, outer sheath application; curing procedure (heat shrink or cold-shrink) must be properly executed. Poor installation can lead to insulation failure or moisture ingress. Axis India+2pvsmart.in+2
Joint must be carefully tested / inspected after installation (insulation resistance, screening continuity, mechanical integrity) before energizing cable. Many supply specifications for joint kits require type-test certificates per relevant standard (e.g. for 11 kV straight-through joints). Bharat Heavy Electricals Limited+2techbaniya.com+2
Given that your company deals with supply & distribution infrastructure (MV/HT cables, possibly in solar-linked or power distribution projects), a 11 kV 3-core 300 sq mm straight-through joint kit is quite relevant when:
You need to extend or repair existing 11 kV cable runs underground or in ducts.
You are deploying new 11 kV cable runs and need reliable inline joints (e.g. in long feeder cables, underground runs, etc.).
You require robust, long-term, moisture-sealed, screened jointing for reliability under Indian environmental conditions (moisture, dust, etc.).
You aim for compliance with standard specifications / utility requirements (insulation integrity, screen-continuity, mechanical protection, type-tested kits) in your tenders and documentation.

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