Insulation Piercing Clamp for LV Cables – Type EA 0138

NTET insulation piercing clamps for LV cables are designed to create safe fixed connection points on conductors up to 1 kV, installed upstream and downstream of secondary substation circuit breakers, pole-mounted substations (PTP), and auxiliary services.
They allow voltage presence/absence checks, earthing, short-circuiting and, in the EA 0556 version, permanent power supply for VDS systems.

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Insulation Piercing Clamp for LV Cables – Type EA 0138
Insulation Piercing Clamp for LV Cables – Type EA 0138

Available variants

NTET offers two families of insulation piercing clamps for LV cables, both based on the same insulating body and the same cable section range, but with different functionalities:

standard fixed point for measurements, earthing and short-circuiting

Parameter Value Unit
NTET codes N0CE0162, N0CE0163, N0CE0164, N0CE0165
Type Insulation piercing clamp for LV cables EA 0138
Field of application Fixed points on LV cables up to 1000 V AC, upstream and downstream of LV breakers in secondary substations, PTP and auxiliary services
Main functions Voltage presence/absence, earthing, short-circuiting, voltage measurements
Single-core cable section range From 10 to 240 mm² (4 sizes: 10–25, 35–70, 95–150, 150–240)
Maximum dimensions H max 54 mm, L max 40 mm
Maximum weight 200 g
Body material Insulating material resistant to flame and atmospheric agents
Active part Tinned copper alloy
Non-active metallic parts Stainless steel
Stainless steel Due viti a brugola apertura 5 mm; piastre metalliche contrapposte per distribuzione sforzi
Clamping system Two 5 mm hex socket screws with opposed metal plates for force distribution
Maximum prospective short-circuit current 0,2 s (tr) – CEI EN 61230
Assigned short-circuit time 1,3 kA per 60 s
Thermal short-circuit withstand 2 – CEI EN 61230
Peak factor n ≥ 1 kV
Rated insulation voltage da –25 °C a +90 °C; 250 °C per 1 s in corto circuito
Protection degree Protection degree
Packaging Boxes of 25 pieces with instruction manual
Notes Suitable for bare or insulated cables
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Insulation Piercing Clamps for LV Cables EA 0138 and EA 0556

Structure and materials

  • Body made of self-extinguishing insulating material, resistant to flame and atmospheric agents, designed for LV cable applications up to 1 kV.
  • Active contact part made of tinned copper alloy to ensure low contact resistance and long-term stability.
  • Non-active metallic components made of stainless steel for high mechanical strength and corrosion resistance.
  • Body composed of two coupled elements; the upper half-shell integrates the piercing block.
  • Clamping system with two 5 mm hex socket screws and parallel metal plates to distribute tightening force and protect the insulating material.

Functions

  • Creation of fixed points on LV cables upstream and downstream of secondary substation breakers, PTP and auxiliary services.
  • Verification of voltage presence or absence and safe voltage measurements.
  • Temporary earthing and short-circuiting of conductors using portable MV/LV devices connected to the expansion plug.
  • For EA 0556 variant: permanent supply of the VDS system on LV breakers via a protected branch with 2 A fuse, maintaining galvanic separation between the active part and other metallic components.
  • Installation possible on live conductors, without removing cable insulation, with IP40 protection once fully tightened.

Compliance

  • Designed in accordance with CEI EN 61230 standard for earthing and short-circuiting devices (Ir current 8 kA, tr time 0.2 s, peak factor n = 2).
  • Protection degree IP40 according to CEI EN 60529.
  • Rated insulation voltage ≥ 1 kV with thermal withstand 1.3 kA for 60 s and guaranteed performance in cable temperature range from –25 °C to +90 °C (250 °C for 1 s in short circuit).
  • Complete markings on each clamp: manufacturer, type, year, short-circuit values (Ir, tr, n), cable section range, CEI EN 61230 references and CE marking; for EA 0556 also the marking “ALIM VDS BT” and 2 A fuse rating.

ENEL references

EA 0127, EA 0138, EA 0556.

Useful resources

Versatile applications

  • Secondary LV substations and MV/LV distribution boards

  • PTP tapping points and auxiliary services of primary substations

  • Measurement and testing systems on live LV lines

  • Measurement and testing systems on live LV lines

  • Power supply for VDS devices on unified LV breakers (EA 0556 variant)

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