Cable Blocks

Cable Blocks for Modular Cable Installations

Cable Blocks NEN-EN-IEC 61914:2021 certified | Ø13-150mm | Complete sets available 

Stackable per layer • Switch cabinets • Lifetime guarantee 

Single Serie

For individual cables Ø16-130mm (ST) and Ø21-160mm (STC). ST has standard mounting, STC features a central fixing hole for masts, poles or concrete. Suitable for low-, medium- and high-voltage.

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Trefoil Serie

Holds three cables in a triangular configuration with 120° angular positioning. TRI offers maximum short-circuit resistance for high voltage, TRI ECO is the economical variant. Diameters Ø24-82mm per cable.

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Square Serie

Fastens four cables in a square arrangement for Ø25-38.5mm. Compact where space is limited.

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Universal Serie

Modular system Ø13-150mm with three or four cables per layer. Layers can be added without dismantling. For more information see the cable blocks page.

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SFHC Serie

Specialised configuration Ø18-40mm for specific mounting requirements.

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Special Serie

Custom solutions for atypical configurations or project-specific requirements.

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Cable blocks versus cable clamps

Series Type Diameter Primary application
Single ST Single cable Ø11-160mm High voltage, data centres
Single STC Single cable (mast) Ø21-160mm Masts, poles
Trefoil TRI 3 cables (heavy duty) Ø15-150mm 3-phase high voltage
Trefoil TRI ECO 3 cables (light duty) Ø24-82mm 3-phase economical
Square 4 cables Ø25-38.5mm Compact
Universal UNI Modular Ø13-67mm Switch cabinets

Modular cable blocks: stackable and expandable 

Cable blocks are fastening systems in which multiple cables are mounted in layers or side by side. The Universal series from KOZ functions as a modular cable block system for switch cabinets where cable configurations change regularly. The block system enables bundles that can be expanded per layer without disturbing existing mounting. 

Cable blocks versus cable clamps

Property  Cable clamps  Cable blocks 
Configuration  Fixed (single, trefoil, square)  Stackable per layer 
Expansion  Full dismantling  Add a layer 
Applications  Fixed routes  Switch cabinets, modifications 
Diameter range  Type-specific  Ø13-150mm universal 

Cable clamps fasten cables permanently. Cable blocks are designed for environments where installations evolve. Switch cabinets undergo multiple expansions during their service life. With modular blockseach expansion can be carried out by adding a layer. 

Certifications

KOZ Cable clamps and blocks are certified to the international NEN-EN-IEC 61914:2021 norm.

Universal cable blocks: configurations

The KOZ Universal series is available in UNI 3x (three cables per layer) and UNI 4x (four cables per layer). Both types are stackable without limit. An installation with twelve cables can be configured as four layers of three cables, or as three layers of four cables. 

The system covers Ø13-150mm without requiring different block types. Control cables, medium-voltage cables and high-voltage cables can be combined within the same installation. Complete sets available including fixing materials matched to the block configuration. 

Industrial applications

Switch cabinets: Low-voltage and medium-voltage switch cabinets organise power supplies, control cables and signal lines in separate layers. During expansion, additional cables are added as a new layer. 

Test facilities: Laboratories with varying cable configurations per test setup. Cable blocks facilitate rapid reconfiguration between test cycles. 

Prefabricated installations: With prefabricated switch cabinets, complete layers are prepared and transported. Stackable blocks accelerate assembly. 

Maintenance-intensive environments: Process industries with periodic cable replacement. A single cable can be removed from a layer without disturbing the rest. 

Technical specifications Universal series

Specification  Value 
Diameter range  Ø13-150mm 
Configurations  UNI 3x (3 cables/layer), UNI 4x (4 cables/layer) 
Material  Polyamide PA66, glass fibre reinforced 
Temperature range  -80°C to +120°C permanent, peaks up to +220°C 
Short-circuit resistance  NEN-EN-IEC 61914:2021 certified 
Chemical resistance  UV, salt water, oils, fuels, alkalis 
Flame retardancy  UL 94 V0, halogen-free 
Stackability  Unlimited per layer 
Guarantee  Lifetime 

Certification in accordance with NEN-EN-IEC 61914:2021 guarantees resistance to electromagnetic forces during short circuits. Tests at KEMA (DNV-GL), Schneider Electric and SGS validate that the blocks hold cables in place at current peaks of up to tens of kiloamperes. 

The PA66 polyamide material retains its mechanical properties across the full temperature range. In switch cabinets where temperatures vary due to load, grip remains consistent. Halogen-free composition meets fire safety requirements for enclosed spaces and rail applications (EN 45545-2). 

Advantages of the KOZ Universal series

Universal diameter range:

Ø13-150mm without custom orders for non-standard cable diameters.

Stackable expansion:

Add layers without dismantling the existing configuration. Installations remain out of service for shorter periods.

NEN-EN-IEC 61914:2021 certified:

Tests at KEMA (DNV-GL), Schneider Electric and SGS validate resistance to electromagnetic forces during short circuits.

Lloyd's Register approval:

Type Approval for maritime and offshore applications. Suitable for platforms, vessels and offshore wind installations.

Lifetime guarantee:

A one-off investment without replacement cycles in installations that remain operational for 20-30 years.

Frequently Asked Questions

What is the difference between cable blocks and cable clamps?

Cable clamps fasten cables permanently. Cable blocks are stackableallowing layers to be added. A cable clamp requires full dismantling to add cables. A cable block accommodates expansion by stacking a new layer. 

Which configurations are available?

UNI 3x (three cables per layerand UNI 4x (four cables per layer). Configurations with five or more cables are available as custom solutionsAll types are stackable without limit for installations with tens to hundreds of cables. 

How do you determine the right configuration?

For narrow switch cabinets, UNI 3x is suitable. For wider cabinets, UNI 4x offers more efficient cable densityCables with similar diameters are grouped per layer. Control cables (Ø13-25mm) separated from power cables (Ø40-100mm). 

Are cable blocks suitable for outdoor installations?

PA66 polyamide is UV resistant and suitable for -80°C to +120°C. Cable blocks can be used outdoors provided they are protected from direct weather exposure. Lloyd’s Register Type Approval available for maritime and offshore applications. 

How are cable blocks mounted?

Complete mounting sets contain standardised fixing materials compatible with DIN railsMounting requires no specialist tools. Recommended tightening torque: 5-8 Nm. Technical manuals and instructional videos are available. 

Contact us

For more information about our cable clamps and cable blocks please feel free to contact us.

Our Location

Albert Plesmanweg 3,
4462 GC Goes
The Netherlands

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