TOXFREE® LSZH N2XH flex
Flexible LSZH power cable for public places.
Flexible LSZH power cable for public places.
ACCORDING TO: IEC 60502-1., UNE 21123-4.
TOXFREE® RZ1-K is a LSZH cable, highly recommended for use in public places.
Enhanced Fire Safety | CPR Cca B2ca LSZH
Enhanced flexibility and ease of Installation
Versatile applications for fixed LSZH power installations
Typical applications of
TOXFREE® LSZH RZ1-K
Select...
TOXFREE® LSZH RZ1-K cables provide superior flexibility and ensure fire-retardant, low-smoke, and halogen-free fire safety (B2ca and Cca) for public places and high rise buildings.
UK Building Regulations, European CPR and worldwide electrical national codes increasingly mandate LSZH cables in public spaces and high-occupancy buildings—making RZ1-K not just better performance, but often a regulatory requirement. Provide minimal smoke emission (enabling clearer evacuation routes and safer escape conditions during fires), prevent the release of corrosive or chlorine-based toxic gases, and reduces potential for smoke inhalation injuries.
TOXFREE® LSZH RZ1-K cables provide superior flexibility and ensure fire-retardant, low-smoke, and halogen-free fire safety (B2ca and Cca) for reliable power in high-risk industrial facilities and construction sites. XLPE insulation provides superior thermal performance (90°C continuous operation) and excellent electrical properties for demanding industrial loads. The LSZH outer sheath meets stringent UK, European and international fire safety standards (CPR B2ca and Cca).
This combination eliminates the need for separate cable specifications, simplifying procurement and ensuring compliance across UK, European and worldwide installations.
RZ1-K Low Smoke Zero Halogen (B2ca and Cca CPR rated) cables are almost compulsory in Data Centres due to their zero downtime tolerance during a possible fire, ensuring safety of people and equipment. The LSZH outer sheath prevents corrosive halogen emissions that could damage sensitive servers, networking equipment, and storage systems worth millions. Minimal smoke production during fire incidents maintains visibility for emergency response and protects delicate electronic components. Class 5 flexibility facilitates installation through raised floors, cable trays, and tight server rack configurations. XLPE insulation ensures reliable 90°C operation under sustained high loads typical of data centre power distribution.
High-occupancy buildings
TOXFREE® LSZH RZ1-K cables provide superior flexibility and ensure fire-retardant, low-smoke, and halogen-free fire safety (B2ca and Cca) for public places and high rise buildings.
UK Building Regulations, European CPR and worldwide electrical national codes increasingly mandate LSZH cables in public spaces and high-occupancy buildings—making RZ1-K not just better performance, but often a regulatory requirement. Provide minimal smoke emission (enabling clearer evacuation routes and safer escape conditions during fires), prevent the release of corrosive or chlorine-based toxic gases, and reduces potential for smoke inhalation injuries.
Industrial facilities
TOXFREE® LSZH RZ1-K cables provide superior flexibility and ensure fire-retardant, low-smoke, and halogen-free fire safety (B2ca and Cca) for reliable power in high-risk industrial facilities and construction sites. XLPE insulation provides superior thermal performance (90°C continuous operation) and excellent electrical properties for demanding industrial loads. The LSZH outer sheath meets stringent UK, European and international fire safety standards (CPR B2ca and Cca).
This combination eliminates the need for separate cable specifications, simplifying procurement and ensuring compliance across UK, European and worldwide installations.
Data Centres
RZ1-K Low Smoke Zero Halogen (B2ca and Cca CPR rated) cables are almost compulsory in Data Centres due to their zero downtime tolerance during a possible fire, ensuring safety of people and equipment. The LSZH outer sheath prevents corrosive halogen emissions that could damage sensitive servers, networking equipment, and storage systems worth millions. Minimal smoke production during fire incidents maintains visibility for emergency response and protects delicate electronic components. Class 5 flexibility facilitates installation through raised floors, cable trays, and tight server rack configurations. XLPE insulation ensures reliable 90°C operation under sustained high loads typical of data centre power distribution.
Resources for engineers
TOXFREE® LSZH RZ1-K Technical datasheet
Download file
TOXFREE® LSZH RZ1-K DoP
Download file
TOXFREE® LSZH RZ1-K
Technical specifications
Application
TOXFREE® RZ1-K is a LSZH cable. In the event of fire, it does not emit toxic gases, nor does it give off corrosive gases, avoiding any possible damage to people or electronic equipment. For these reasons it is highly recommended for use in public places such as: hospitals, schools, museums, airports, bus terminals, shopping malls, offices, laboratories, etc.
Construction
Conductor
Insulation
XLPE.
The standard identification of insulation conductors according to HD 308, is the following:
1 x Natural.
2 x Blue + Brown.
3 G Blue + Brown + Green/Yellow.
3 x Brown+ Black+ Grey.
3 x + 1 x Brown + Black + Grey + Blue (reduced cross-section).
4 G Brown + Black + Grey + Green/Yellow.
4 x Brown + Black + Grey + Blue.
5 G Brown + Black + Grey + Blue + Green/yellow.
6 or more: Black numbered + Green/Yellow.
Outer sheath
Polyolefin LSZH.
Green colour.
Other colours available on request.
Standards / Compliance
ACCORDING TO: IEC 60502-1., UNE 21123-4.
Standards and approvals
- CE.
- SEC.
- KEMA-KEUR.
- AENOR.
- RoHS.
Construction Products Regulation
- Cca-s1a, d1, a1.
- B2ca-s1a, d1, a1.
Disclaimer
The information displayed on this website is provided for reference purposes only and is not legally binding. Specifications, values, and technical data may be subject to change without notice. To obtain verified and up-to-date technical data for a specific cable, please download Top Cable’s official Technical Specification in PDF format. The PDF document constitutes the sole authoritative source of product data.
Characteristics
Electrical performance
0,6/1kV
Thermal performance
Maximum conductor temperature: 90ºC.
Maximum short-circuittemperature: 250ºC (max. 5 s).
Minimum service temperature: -40ºC (fixed and protected installations).
Minimum installation and handling temperature: 0ºC.
Fire performance
Flame non-propagation according to EN 60332-1 and IEC 60332-1.
Fire non-propagation according to UNE-EN 60332-3 / IEC 60332-3 EN 50399.
Reaction to fire CPR: B2ca-s1a, d1, a1 or Cca -s1a, d1, a1 according to EN 50575.
LSZH (Low Smoke Zero Halogen) according to EN 60754-1 and IEC 60754-1.
Low corrosive gases emission according to EN 60754-2 / IEC 60754-2.
Low smoke emission according to UNE-EN 61034 and IEC 61034.: Light transmittance > 80%.
Mechanical performance
Minimum bending radius: x5 cable diameter.
Minimum bending radius: x5 cable diameter.
Impact resistance: AG2 Medium severity.
Test impact at -25ª according to H604-5D
Environmental performance
Chemical & Oil resistance: Acceptable.
UV resistant according to EN 50618.
Water resistance: AD8 Submersion.
Installation conditions
Open Air.
Buried.
In conduit.
Other
Meter by meter marking.
Why choose our TOXFREE® LSZH RZ1-K
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As cable manufacturers, we ensure cost-effective premium quality and lasting performance.
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Our in-house labs guarantee rigorous cable quality, reliability, and standards compliance.
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Global cable delivery solutions—expert logistics for seamless supply.
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Full cable stock, ready for fast delivery- shortest lead times.
Largest European stockholding. -
EPD-certified cables: Sustainable manufacturing for your Scope 3 success.
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Expert, friendly and professional sales team offering a fast & efficient customer service. Global customers are welcome!
Need expert advice, a custom solution, or an RFQ?
FAQ's TOXFREE® LSZH RZ1-K
Each cable has a standardised designation. The letters and numbers refer to the cable outer sheath, other sheaths, the conductor class, the rated voltage and the final composition of the cable. In the case of RZ1-K, the letters stand for:
Insulation:
- R : Cross-linked polyethylene (XLPE).
- Z1: Halogen Free polyolefin outer sheath.
- -K : Cooper flexible conductor (class 5) for fixed installations.
Here you can find more information on the designation of electrical cables.
Our RZ1-K cables are manufactured to be fire-non propagator, effectively preventing the spread of fire in the event of a short-circuit or other electrical fault. These fire non-propagation properties are based on EN 60332-3 / IEC 60332-3 / EN 50399. According European norm CPR EN 50575, TOXFREE® RZ1-K reaction to fire is B2ca s1a, d1, a1 or Cca-s1a, d1, a1 (see cross-section).
- Other fire properties are:
- Flame non-propagation based on EN 60332-1 and IEC 60332-1
- Low corrosive gases emission based on UNE-EN 60754-2 and IEC 60754-2.
- Low smoke emission according to EN 61034 and IEC 61034: Light transmittance > 80%.
- LSZH (Low Smoke Zero Halogen) based on UNE-EN 60754-1 and IEC 60754-1.
The CPR classification of TOP CABLE TOXFREE® RZ1-K cable is B2ca-s1a,d1,a1 / Cca-s1a,d1,a1. In several European countries, the installation of CPR Cca-s1a,d1,a1 cables is mandatory in public places such as: hospitals, schools, museums, airports, bus stations and shops in general.
Here you can read more about the European Construction Products Regulation (CPR) and its fire performance classification system for electrical cables.
TOXFREE® RZ1-K (AS) is a High Safety cable: halogen-free, low smoke and corrosive gas emission, non-fire propagating.
TOXFREE® PLUS RZ1-K (AS+) is a High Safety fire resistant cable that has been specially designed to continue transmitting electrical energy during a fire.
Although both cables have the same flexible conductor (-K : Flexible copper class 5 for fixed installations) and insulation (R : Cross-linked polyethylene XLPE), the outer sheath varies: the outer sheath of the RZ1-K cable is made of halogen-free thermoplastic polyolefin, while the RV-K cable has a PVC (Polyvinyl chloride) outer sheath.
