Heat-shrink joint Radpol MP-DM2R (ZRM-2) for 4×35–4×70 mm² cables up to 1 kV

Radpol MP-DM2R (ZRM-2) is a heat-shrink joint designed for four-core power cables with conductor cross-sections from 35 to 70 mm² for systems up to 1 kV. The joint combines a heat-shrink outer sleeve with internal insulating and sealing layers to provide mechanical protection, environmental sealing and electrical insulation for cable splices. It is intended for indoor and outdoor applications in low-voltage distribution networks as well as for repair and installation of power lines.

Advantages

The construction ensures reliable electrical insulation and a compact mechanical splice with corrosion-resistant materials. The heat-shrinkable outer layer forms a tight, water-resistant barrier when installed with controlled heating, while internal components maintain dielectric strength and prevent moisture ingress. The joint is compatible with common copper and aluminum conductor types in the specified cross-section range and is suitable for both permanent installations and field repairs.

Suitable for

• Four-core low-voltage power cable splices up to 1 kV
• Field repairs and emergency restoration of distribution lines
• Indoor and outdoor cable jointing where environmental sealing is required
• Service connections and splice points in substations and distribution networks

Key specifications

• Compatible conductor cross-section: 4×35–4×70 mm²
• Maximum voltage rating: up to 1 kV
• Heat-shrink outer sleeve for environmental sealing
• Internal insulating layers for electrical insulation and mechanical support
• Designed for both indoor and outdoor use
• Suitable for copper and aluminum conductors within the specified range

How to use

Prepare cable ends by cutting to length, stripping insulation to the required conductor exposure and cleaning conductor surfaces according to standard practice. Assemble the joint components over the prepared conductors, ensuring correct placement of internal insulating layers and positioning of the heat-shrink sleeve. Apply heat evenly with a suitable torch or hot-air tool until the outer sleeve shrinks and the internal sealant flows to form a continuous, watertight barrier. Allow the assembly to cool before handling and perform any required electrical tests to confirm insulation integrity.

Usage recommendations

Use appropriate personal protective equipment and follow local regulations and safety standards for low-voltage cable work. Verify conductor compatibility and strip lengths before installation. Apply heat gradually and evenly to avoid overheating insulating materials; ensure a complete seal around the cable jacket for long-term moisture protection. For critical or buried applications, follow additional installation practices recommended by network operators or standards bodies.