Single-core insulation piercing branch connectors for LV cables

Single-core insulation piercing branch connectors for self-supporting LV cables, suitable for the simultaneous connection of the main line cable and the branch cable without removing the insulation. Ideal for overhead low-voltage copper or aluminium networks, they ensure long-term electrical and mechanical reliability and a degree of protection up to IP4X.

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Single-core insulation piercing branch connectors for LV cables

Available variants of single-core insulation piercing branch connectors for LV cables

Suitable for branching from main cables with larger cross-section (up to approx. 70 mm²) to copper or aluminium branch cables with medium-small cross-section.

Parameter Value Unit
Description Single-core insulation piercing branch connector for self-supporting LV cables
Application field Branching of stranded overhead copper/aluminium cables in LV networks (U₀/U = 0.6/1 kV)
Through cable – reference DC4182
Through cable – indicative cross-section 35–70 mm² Al (70/54,6 – 35/54,6)
Branch cables – examples DC4121 / DC4122 (6–16–25 mm² Cu), DC4125–4126 (10–50 mm² Al), DC4181–4183 (10–35–16 mm² Cu/Al)
Connector body Hot-dip galvanized steel, break-off head with preset torque
Tightening screw Hot-dip galvanized steel, break-off head with preset torque
Degree of protection after installation IP4X (IP2X with closed but not tightened conductor) according to CEI 70-1
Installation On live through cables, without removing the insulation
Construction parts All parts are captive
Markings Manufacturer mark, year, ENEL code, NTET code, insulating material
Notes Suitable for overhead stranded copper or aluminium cables; use on self-supporting LV lines
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Technical specifications Single-core insulation piercing branch connectors for LV cables

Structure and materials

  • Active conductive part made of tinned copper or tinned aluminium, with Brinell hardness HB > 100 and minimum tin plating thickness of 5 μm.
  • Connector body made of insulating, self-extinguishing PBT material, designed for installation on outdoor LV lines.
  • Hot-dip galvanized steel tightening bolt, co-moulded with break-off head to ensure correct tightening torque.
  • All construction parts are captive, preventing the loss of components during overhead installation.

Functionality

  • Allows simultaneous connection on the main through cable and the branch cable, without stripping the insulation.
  • Enables installation on live cables, in compliance with company safety procedures.
  • Ensures a protection degree not lower than IP2X before full tightening and IP4X after installation, reducing the risk of accidental contact and the ingress of foreign bodies.
  • Compatible with overhead stranded copper or aluminium cables for self-supporting LV networks and suitable for different cross-section ranges on both the main and branch sides.

Compliance

  • Designed for use on LV systems with rated voltage U₀/U = 0.6/1 kV.
  • Degree of protection IP2X/IP4X verified in accordance with CEI 70-1 standards (now CEI EN 60529).
  • Markings on each unit: manufacturer, year of manufacture, ENEL designation code, NTET identification code, type of insulating material.
  • Connector suitable for use with ENEL-coded overhead cables (DC412x, DC418x series, etc.), in compliance with self-supporting LV network specifications.

Useful resources

Versatile Applications

  • Branching on self-supporting LV cables in copper or aluminium for overhead distribution networks.

  • Creation of tapping points for single or grouped users on low-voltage lines.

  • Connection of service lines or public lighting systems from existing LV feeders.

  • Maintenance and upgrading operations on overhead lines in secondary substations or urban distribution networks.

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