Insulation Piercing Connectors LV for Low Voltage Live Working & Cable Jointing

Published 27 Jul 2022

Insulation Piercing Connectors LV

Thorne & Derrick | Approved Pfisterer Supplier | UK & Export Sales

Insulation piercing connectors LV

Safe & Easy Live Line Working at Low Voltage Networks & Cables

Live line working is increasingly essential in low voltage networks. Bolted connectors used for this purpose should be easy to install and ensure the best possible occupational safety. The LV piercing connector family from PFISTERER has been developed to meet today’s practical requirements. Durable contacts come as standard, and have been a PFISTERER core competence for nearly 100 years.

Conductor does not have to be stripped

Insulation piercing connectors connect and make electrical contact with conductor ends, whatever the conductor cross-section, type and insulation. Because they pierce the insulation during installation, preparatory work on the conductor, such as stripping or brushing the contact area, is eliminated when live working.

The shear bolts on insulation piercing connectors LV are based on patented SICON technology. The electrical connector bolts are equipped with a piercing system that reliably penetrates the conductor insulation during installation by the cable jointer. A rotatable disc at the base of the bolt prevents damage to individual strands and ensures the correct contact force for all conductor materials.

New installations or repairs LV piercing connectors easily and safely connect all low voltage cables - even under voltage

New installations or repairs LV piercing connectors easily and safely connect all low voltage cables – even under voltage

Good occupational safety

The insulating body and plastic cover caps provide IP2X protection against finger contact in accordance with EN 60529. On type 3 and above, plastic flaps prevent inadvertent contact with the inside of the conductor channel. The elastomer insert ensures protection against contact after the bolts shear off.

Low shear off torque

The shear off bolts are tightened using standard tools. Once the optimal contact force is reached, the bolt gently breaks away at a torque of between 2.5 and 27 Nm, depending on the type. This prevents common installation errors and makes live line working much safer.

LV Piercing Connectors | Live Line & Working Cable Jointing

Compact and well designed

Once installed, the small size of LV piercing connectors makes subsequent work easier. Compact cable joints with cast resin mean that fewer resources are needed for the final installation. The connectors can be placed close to each other without any further accessories.

Type 1 and 2 are equipped with a push together system: multiple connectors can be joined together to form a compact unit. With type 3 to 5, the elimination of the cover caps ensures the smallest possible dimensions.

Connector Benefits

  • Insulation does not have to be stripped from individual conductors
  • Easy, safe installation – ideal for live line working
  • Shear-off bolts prevent installation errors
  • IP2X protection against electrical hazards
  • Consistent operational reliability, according to IEC 61238-1 Class A
  • Compact design – less cast resin when jointing cables
  • Creepage distance conform to EN 60664, Pollution Degree 1

LV Piercing Connectors In Figures

  • Voltage: up to 1 kV
  • Conductor cross-section: 1 to 240 mm²
  • Conductor category: class 1 and 2
  • Shear torque: 2.5 to 27 Nm

Further Reading

Thorne & Derrick are national distributors of LV, MV & HV Cable Installation, Jointing, Substation & Electrical Equipment


Thorne & Derrick stock and distribute PFISTERER CONNEX Connectors for medium / high voltage cable connection and termination to electrical systems up to 33kV – we provide competitive prices for PFISTERER CONNEX connectors used to terminate and connect polymeric insulated MV-HV cables into gas insulated switchgear and electrical equipment from extensive UK stocks.

Thorne & Derrick are national distributors of LV, MV & HV Cable Installation, Jointing, Substation & Electrical Equipment – servicing businesses involved in cabling, jointing, substation, earthing, overhead line and electrical construction at LV, 11kV, 33kV, 66kV and EHV. Supplying a complete range of power cable accessories to support the installation and maintenance of low/medium and high voltage cable systems:

  • Slip-on Cable Terminations
  • Cold-shrink Cable Terminations
  • Heat-shrink Cable Terminations
  • Cable Joints – Heat & Cold-shrink
  • Separable Connectors (Euromold)
  • Surge Arresters & Switchgear/Transformer Bushings

Key Product Categories: Duct Seals | Cable Cleats | Cable Glands | Electrical Safety | Arc Flash Protection | Cable Jointing Tools | Cable Pulling | Earthing | Feeder Pillars | Cable Joints LV | Joints & Terminations MV 


The SEANEX inner cone solution is an offshore variant of the successful Connex HV connection system that is specially adapted for 66kV inter-array cabling.

MV Connex Training with Pfisterer

MV Connex Products | Ex Stock Thorne & Derrick | Inner Cone Cable Connectors 33kV


Further Reading