LSZH Medium Voltage Cable: Specifications, Applications, and Selection Guide

LSZH medium voltage (MV) cable is designed to transmit power at medium voltage while using low-smoke, zero-halogen materials in specified cable components, typically the outer sheath. It can be a suitable choice for tunnels, buildings, transport infrastructure, and other locations where smoke and corrosive gas during a fire are important concerns. The right specification depends on the system voltage, installation conditions, conductor material and size, insulation, screens, and applicable project standards. LSZH describes material behavior; it does not by itself mean that a cable is fire-resistant or maintains circuit operation during a fire.

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Key takeaways

Specify the cable by system voltage and the cable’s rated voltage designation, rather than by the term “medium voltage” alone.
Confirm which components are LSZH and request the relevant material and fire-performance documentation for the project.
Match conductor, insulation, screens, armour, and sheath to load, installation method, environment, and local requirements.
Ask suppliers to confirm construction, applicable standards, test documentation, minimum order quantity, and lead time before purchase.

Who this guide is for

This guide is for electrical contractors, EPC companies, project engineers, distributors, and procurement teams evaluating LSZH MV power cable. It is intended to support early specification and supplier discussions, not replace a project design or review by a qualified electrical engineer. Cable requirements vary by country, utility, installation, and governing standard. Confirm the final design against the project documents and local regulations.

What is LSZH medium voltage cable?

LSZH stands for low smoke zero halogen. In a cable specification, it generally refers to a sheath or other identified material formulated to produce limited smoke and avoid halogen-containing acid gases under defined test conditions. The exact meaning depends on the materials and test requirements stated in the purchase specification. Buyers should check whether LSZH applies to the outer sheath alone or to additional cable components.

An MV cable typically includes a conductor, conductor screen, insulation, insulation screen, metallic screen, and outer sheath. Depending on the design and installation, it may also include bedding, armour, or water-blocking elements. XLPE is commonly used as MV insulation, but the complete construction must be selected for the system and environment. LSZH material choice does not replace requirements for voltage withstand, mechanical protection, or fire survival.

Common specifications and construction options

Voltage designation is a starting point, not a complete cable specification. Common MV designations include 6/10 kV, 8.7/15 kV, 12/20 kV, and 18/30 kV, but availability and suitability depend on the applicable standard and network conditions. In these designations, U₀ refers to rated voltage between conductor and earth, while U refers to rated voltage between conductors. Confirm the system’s highest voltage and earthing arrangement with the project engineer.

Conductor and insulation

Conductors are commonly copper or aluminium. Copper offers higher conductivity for a given cross-sectional area, while aluminium can reduce conductor mass; the appropriate choice depends on current, route, termination compatibility, and project economics. Conductor sizes are selected through electrical calculations that account for load, installation conditions, voltage drop, and short-circuit duty. Do not choose a size from voltage class alone.

XLPE insulation is widely used for MV applications. A typical XLPE design may specify a maximum continuous conductor operating temperature of 90°C, but the allowable value must be verified against the cable standard, construction, and installation conditions. The conductor screen and insulation screen help provide a controlled electric field around the insulation. Screen design and metallic screen cross-section should be checked against the project’s earth-fault and short-circuit requirements.

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Sheath, armour, and optional features

LSZH outer sheaths may be selected for indoor or enclosed routes where reduced smoke and halogen emissions are required by the project. Armour can provide mechanical protection for certain direct-buried or exposed installations, while unarmoured designs may suit protected ducts or other routes. Neither option is universally better: installation method, pulling forces, impact risk, corrosion exposure, and bonding arrangements matter. Water-blocking features may also be considered where moisture ingress is a concern.

Applications and matching the cable to the route

LSZH MV cable may be considered for commercial and industrial buildings, metro and railway infrastructure, tunnels, airports, data facilities, and utility or renewable-energy projects when the specification calls for LSZH materials. In occupied or enclosed spaces, smoke and corrosive gas requirements can be important inputs to fire-safety planning. The cable must still meet the project’s electrical and mechanical requirements. A standard LSZH sheath alone should not be interpreted as proof of fire resistance, flame-retardant classification, or circuit integrity.

Indoor risers and buildings: Confirm smoke, halogen, flame, and installation requirements, as well as support and routing provisions.
Tunnels and transport routes: Review fire strategy, mechanical protection, water exposure, and the required cable test classifications.
Industrial sites: Check chemical exposure, ambient conditions, fault levels, and compatibility with terminations and switchgear.
Buried or ducted routes: Specify armour or other protection based on civil design, soil conditions, pulling method, and local practice.

Selection framework for B2B buyers

Define the electrical system. Provide nominal and highest system voltage, frequency, earthing method, load, and short-circuit information. Systems commonly operate at 50 Hz or 60 Hz, but the project value must be confirmed.
Describe the installation. State whether the route is in air, a duct, a tunnel, a tray, or directly buried. Include ambient conditions, route length, grouping, pulling constraints, and exposure to water, chemicals, or impact.
Specify required performance. Identify the applicable cable standard and any required LSZH, smoke, flame, fire-resistance, or circuit-integrity tests. These properties are separate requirements and should be written explicitly.
Confirm construction details. Select conductor material and size, insulation, screen arrangement, armour, sheath, and any water-blocking options with the design team. State accessories and termination interfaces where relevant.
Review documentation and acceptance criteria. Request a datasheet, construction drawing, routine and type-test documentation as applicable, marking details, and inspection requirements. Confirm that the documents match the offered construction and purchase specification.

Pricing, MOQ, and lead time

LSZH MV cable pricing depends on voltage class, conductor material and cross-section, screen and armour design, sheath compound, order quantity, packaging, and market conditions. Minimum order quantity and production lead time can vary with the requested construction and available materials. A reliable quotation should identify the exact cable build, applicable standard, quantity, delivery destination, and requested documentation. For a comparable offer, send the same technical schedule to each supplier rather than comparing price per meter without construction details.

Supplier evaluation checklist

Before placing an order, check whether the supplier can clearly explain the proposed construction and identify deviations from your specification. Ask for evidence appropriate to the order, such as technical datasheets, drawings, test records, and material declarations, and confirm their scope and validity. Review quality-control, packaging, drum-length, marking, and inspection arrangements as part of the quotation. Clarify how technical questions, document revisions, and shipment coordination will be handled.

Common selection mistakes

Assuming “LSZH” automatically means fire-resistant or suitable for every emergency circuit.
Ordering by voltage label without confirming U₀/U rating and system earthing.
Leaving screen sizing, armour, or water-blocking requirements undefined.
Accepting a generic datasheet that does not match the requested cable construction or test criteria.

How Chuangjin Cable can support your inquiry

At Chuangjin Cable, we support B2B buyers evaluating electrical wires and medium voltage power cable by reviewing the project’s requested voltage class, construction, installation conditions, and documentation needs. Sharing a cable schedule, technical specification, or bill of quantities helps us assess the inquiry more accurately. Where a requirement is unclear or depends on local regulations, we recommend confirming it with the project engineer before finalizing the order. We can then discuss the applicable product configuration, quotation information, and supply arrangements.

Conclusion: choosing the right LSZH MV cable

LSZH medium voltage cable is appropriate when a project needs MV power transmission and specifically requires low-smoke, zero-halogen materials in identified cable components. Selection should begin with the system voltage and installation conditions, then define conductor, insulation, screens, protection, sheath, and required fire-related tests. Treat LSZH, flame retardancy, and fire survival as distinct properties, and request documentation that corresponds to the exact offered construction. For a practical next step, send Chuangjin Cable your voltage designation, route details, required standards, quantity, and delivery target so the specification and supply options can be reviewed.