Description

Elsewedy 3-Core Unarmored Aluminum Cable Joint, (95+50) mm², 1 kV

Introduction: Connection Engineering for Large (95+50) mm² Aluminum Conductors

In electrical power distribution, aluminum cables are a strategic and economical option, particularly in major infrastructure and industrial projects. A cross-section of95 mm²for the three phases and50 mm²for the neutral provides a main power path for high-load applications requiring stable current transfer. A critical point in these systems is the joint, which must carry continuous current that may exceed230 Awhile accommodating the chemical and physical behavior of aluminum, including rapid oxidation and sensitivity to mechanical and thermal stress.

The Elsewedy joint for(95+50) mm²It is not merely an insulating cover; it is an integrated system designed to rebuild the unarmored cable’s electrical insulation, mechanical protection, and moisture seal while maintaining the connection against moisture- and soil-related corrosion.

Chapter One: Engineering Structure and Three-Layer Protection System

Elsewedy joints use advanced radiation-crosslinked polymer technology and consist of technical layers that work together to rebuild the unarmored cable:

1. Industrial-Grade Phase Insulation Tubes

The kit includes four heavy-wall polymer tubes, three for95 mm²and one for50 mm², each heat-shrinking individually over an aluminum conductor.

• Technical Performance:These tubes provide high dielectric strength to help prevent electrical arcing between adjacent phases. The material is designed to resist stress cracking caused by thermal expansion of aluminum during sustained full-load operation. The heavy wall of the Elsewedy tubes supports stable insulation performance during voltage fluctuations.

2. Active Hot-Melt Sealing Technology

The inner and outer tubes are lined with a dense layer ofactive hot-melt adhesive.

• Critical Function:When the joint is heated, the adhesive becomes semi-fluid and flows into gaps around the aluminum strands. This seal helps block oxygen and moisture that can promote formation of insulating aluminum oxide, increase electrical resistance, and cause overheating. The adhesive is formulated to bond effectively to PVC, XLPE, and PE cable materials.

3. Heavy-Duty Outer Protective Sleeve

A large heavy-wall outer tube that acts as a protective barrier against external conditions.

• Features:The outer protection is designed to resist UV exposure, soil acids, and alkalis. It also provides additional mechanical protection that compensates for the absence of metallic armor and supports direct burial while helping protect against minor mechanical impact and environmental corrosion from salts and soil chemistry.

Chapter Two: Technical Challenges and Elsewedy Solutions for 95 mm² Aluminum

1. Managing Thermal Stress Under Continuous Load

An aluminum conductor with a cross-section of95 mm²can generate significant heat under full load. Even a small increase in contact resistance within the joint can create a thermal hot spot that affects system stability.

• The solution:Elsewedy polymer tubes are manufactured for stable dielectric and thermal performance, helping manage heat while maintaining insulation integrity at elevated cable operating temperatures.90°C.

2. Mechanical Expansion in Unarmored Cables

Because the cable is unarmored, it lacks an internal metallic structure that restricts longitudinal movement. Aluminum expands differently from copper and therefore requires flexible insulation capable of accommodating repeated conductor-size changes during thermal cycling.

• The solution:Elsewedy tubes retain elastomeric flexibility and continue to compress around the cable, forming a dynamic seal that follows cable movement without losing the moisture barrier or creating leakage paths through gaps caused by repeated thermal expansion and contraction.

Chapter Three: Joint Applications in Major Critical Projects

This joint is used where stable and economical power transmission is required:

• Distribution Networks for New Cities:Where distribution kiosks and main switchboards use aluminum cables with a cross-section of95 mm²to supply large residential developments.

• Highway and Major-Road Lighting:For networks requiring 95 mm² conductors to limit voltage drop over very long runs and maintain the required voltage at the far end of the circuit.

• Industrial Complexes and Factories:For joining feeder cables to large motors and machinery where aluminum is used to reduce overall infrastructure cost.

• Large Agricultural Projects:For supplying pumping and irrigation stations operating in high-humidity or saline environments, where robust 100% moisture sealing is required.

Chapter Four: Technical Installation Guide for (95+50) mm²

To support a service life exceeding30 years, the following strict installation procedure should be followed:

1. Conductor Preparation:Clean the aluminum strands95 mm²thoroughly and remove the oxide layer with a dedicated wire brush, then immediately apply contact grease to reduce re-oxidation before fitting the connector.

2. Mechanical Connection:Use connectors specifically rated for aluminum. Hydraulic crimping with dies correctly matched to the 95 mm² size is recommended to provide uniform compression and minimize trapped air.

3. Heat Distribution:Heat the tubes evenly in a circular motion from the center toward the ends using a gas torch to expel trapped air and reduce voids that may contribute to partial discharge.

4. Chemical Cleanliness:Ensure the joint area is free of dust, oil, and moisture before heat shrinking so the active adhesive can bond fully and effectively.