LSZH medium voltage cable is designed to transmit power at medium voltage while using materials formulated to emit limited smoke and no halogen acid gases under specified fire-test conditions. To select the right cable, first confirm the system voltage, conductor size, insulation, screening, installation environment, and applicable project standards. Then specify sheath performance, fire requirements, accessories, and documentation with your supplier. At Chuangjin Cable, we use these details to understand project requirements and prepare a product proposal for review.
This guide is for electrical contractors, EPC companies, distributors, utilities, and industrial buyers comparing medium voltage cable for a project or tender. It is particularly relevant where smoke visibility and corrosive gas emissions are part of the building, infrastructure, or equipment specification. It is not a substitute for the project engineer’s cable calculations or the governing local code. Final selection should be checked against the network design and installation conditions.
LSZH, also written as LS0H or LSHF, describes a low-smoke, zero-halogen sheath or cable material requirement. The term does not by itself define the cable’s voltage rating, conductor, insulation, or fire-resistance performance. A cable described as LSZH should therefore be specified with the relevant test methods and acceptance criteria, rather than relying on the abbreviation alone. The complete cable construction and test scope matter.
Medium voltage cable commonly includes a conductor, conductor screen, primary insulation, insulation screen, metallic screen or wire shield, and outer sheath. Depending on the design, it may also include water-blocking components, armour, or additional protective layers. XLPE is a common insulation choice, while copper or aluminium may be specified for the conductor. The right configuration depends on electrical calculations, installation conditions, and the required standards.
| Component | Common options | Buyer considerations |
|---|---|---|
| Conductor | Copper or aluminium; stranded constructions | Load, voltage drop, short-circuit duty, termination compatibility, and cost |
| Insulation | XLPE or another project-specified compound | Voltage class, operating conditions, and applicable product standard |
| Metallic screen | Copper wires, tape, or a specified screen arrangement | Earth-fault current, earthing design, and screen bonding method |
| Outer sheath | LSZH compound with project-defined properties | Smoke, halogen, flame, UV, moisture, and mechanical requirements |
| Protection | Armour or water-blocking elements when specified | Direct burial, mechanical exposure, and moisture risk |
Begin with nominal system voltage and the cable’s rated voltage designation. IEC 60502-2 covers extruded-insulation power cables for rated voltages from 6 kV to 30 kV, with corresponding maximum system voltages from 7.2 kV to 36 kV. That range is a useful reference, not a substitute for checking the project standard or the exact voltage designation required. Confirm whether the specification uses IEC, another national standard, or a utility-specific document.
Conductor cross-section should be selected through engineering calculations, not by load current alone. The design may need to account for installation method, ambient and soil conditions, grouping, voltage drop, fault current, and allowable conductor temperature. For many XLPE cable designs, 90°C is a common maximum conductor temperature under normal operating conditions, but the applicable limit must be verified for the selected construction and standard. Ask the design engineer to confirm the assumptions behind the ampacity.
For fire-related performance, distinguish low-smoke and halogen-free requirements from flame-retardant or fire-resistant requirements. These describe different properties and test objectives; an LSZH designation alone does not establish that a cable will maintain circuit integrity during a fire. Specify the exact test standard and acceptance criteria for smoke, halogen content, flame propagation, or fire resistance where required. This helps prevent a material label from being mistaken for a complete fire-performance specification.
LSZH cable may be considered for buildings, transport infrastructure, industrial facilities, and other locations where project requirements address smoke or corrosive gas emissions. Whether it is appropriate depends on the complete installation design and the local specification. Indoor cable routes may place greater emphasis on smoke and halogen criteria, while outdoor or buried routes may call for additional attention to moisture, UV exposure, impact, and soil conditions. Do not assume one sheath construction addresses every environmental risk.
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For a power distribution project, coordinate the cable’s metallic screen with the earthing and protection design. For direct burial, verify whether armour or other mechanical protection is required and whether the sheath and water-blocking design suit the site. For constrained routes, check the cable’s outside diameter, minimum bend radius, and pulling limits against the route plan. Confirm compatibility with joints, terminations, and switchgear before placing an order.
A frequent mistake is ordering “LSZH medium voltage cable” without stating the voltage class, construction, or test requirements. Another is treating low-smoke, halogen-free, flame-retardant, and fire-resistant as interchangeable terms. Buyers can also overlook screen sizing, accessory compatibility, or route-specific mechanical protection. A complete technical schedule and a written deviation review reduce the risk of mismatched supply.
Cable pricing depends on factors such as conductor material and size, voltage class, number of cores, screen and sheath construction, order quantity, and copper or aluminium market conditions. Special requirements, testing, packing, and delivery destination can also affect the quotation. Minimum order quantities and production lead times vary with the requested design, material availability, and manufacturing schedule. We recommend requesting a project-specific quotation rather than relying on a generic price per metre.
To help suppliers quote efficiently, provide a bill of quantities or cable schedule, delivery location, required delivery date, and any inspection or document requirements. If the design is still under development, identify which details are fixed and which are open to technical review. Request confirmation of the proposed construction, applicable standards, deviations, and expected production and shipping schedule in writing. This makes commercial comparisons more meaningful.
At Chuangjin Cable, we support B2B inquiries by reviewing the required voltage, cable construction, standards, quantity, and delivery details. We can use your cable schedule or specification as the starting point for discussing suitable options and clarifying any open technical information. Product availability, production timing, testing scope, and documentation should be confirmed for each order. This project-based approach helps buyers evaluate both technical fit and commercial scope.
LSZH medium voltage cable selection requires more than choosing a low-smoke, halogen-free sheath. Confirm the voltage rating, conductor sizing, insulation, screens, installation environment, fire-test requirements, and compatible accessories against the project specification. Treat cable temperature limits and other design values as construction- and standard-dependent, and have the responsible engineer verify them. Clear documentation is essential for a dependable comparison between suppliers.
To begin a product inquiry with Chuangjin Cable, share your voltage class, cable schedule, applicable standards, installation conditions, required quantity, and destination. We can review the information, identify details that need confirmation, and prepare a project-specific proposal for your evaluation. Where specifications are incomplete, include your open questions so the technical and commercial scope can be clarified before ordering.
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