Choose an LSZH XLPE medium voltage cable by matching its voltage rating, conductor size, installation conditions, fault duty, and applicable project standards—not by selecting on the material name alone. XLPE is the insulation, while LSZH usually describes the cable’s low-smoke, halogen-free sheath or other specified non-metallic components; the exact construction must be confirmed in the datasheet. Start with the project’s electrical and environmental requirements, then ask suppliers to confirm the proposed design against them before ordering.
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This guide gives project engineers and purchasing teams a practical selection process. It also highlights common specification gaps that can cause redesign, procurement delays, or a cable that is unsuitable for the installation.
Begin with the nominal system voltage, earthing arrangement, and expected operating conditions. Medium voltage classes commonly encountered in project specifications include 6/10 kV, 8.7/15 kV, and 18/30 (36) kV, but these examples are not interchangeable recommendations. The correct U0/U/Um rating depends on the system and the governing standard, so have the project engineer confirm it before requesting quotations.
Also identify the required standard and any project-specific amendments. Standards may set requirements for cable design, routine tests, type tests, and marking, and requirements can differ by market or installation. Ask each supplier to state the proposed standard and identify any exceptions rather than assuming that a voltage label alone proves compliance.
Provide the supplier with the load current, operating profile, circuit length, installation method, and relevant ambient or soil conditions. These factors affect conductor selection and permissible current carrying capacity. The conductor size must also be checked for voltage drop and short-circuit withstand, which can lead to a larger size than a simple load-current calculation suggests.
Specify the prospective fault current and the protection system’s fault-clearing time when available. XLPE cable designs commonly use a maximum conductor operating temperature of 90°C and a short-circuit conductor temperature of 250°C as design reference points, but these values depend on the applicable standard, construction, and fault duration. Confirm the actual allowable limits in the manufacturer’s datasheet and engineering calculations rather than treating these figures as universal ratings.
State whether the project requires copper or aluminium conductors, and specify the preferred conductor shape or class if the design calls for one. Material choice can affect weight, termination requirements, and cable sizing, so compare the complete design rather than only the conductor price. The supplier should state conductor material, nominal cross-sectional area, and construction in the technical schedule.
Medium voltage cable commonly includes a conductor screen, XLPE insulation, and an insulation screen, with metallic screening or a concentric conductor defined by the design. Specify the required screen material and cross-sectional area, as well as earthing and bonding requirements. These details influence the cable’s electrical construction and the compatibility of joints and terminations.
Installation route determines whether the cable needs armour or another form of mechanical protection. Direct burial, ducts, cable trays, tunnels, and industrial facilities can impose different mechanical and environmental demands. Do not assume that every LSZH XLPE cable is suitable for direct burial or exposed installation; confirm the intended use and protective construction with the supplier.
Where armour is specified, coordinate its material and design with the project’s earthing, corrosion, and installation requirements. The cable’s outside diameter and bending requirements should also be checked against ducts, trays, and termination space. Request the proposed dimensions and minimum bending guidance for the exact cable design.
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“LSZH” is not a complete cable specification by itself. Clarify whether low-smoke, halogen-free properties are required for the outer sheath, other non-metallic components, or the complete cable construction, and identify the test methods or standard required by the project. If the specification calls for limits on smoke emission, halogen acid gas, or flame performance, include those requirements explicitly.
Low-smoke, halogen-free properties do not mean that a cable is fireproof or guaranteed to maintain circuit operation during a fire. If the circuit must remain functional under fire conditions, specify the required fire-resistance or circuit-integrity performance separately and verify that it applies to the complete cable system. This distinction helps prevent a sheath material requirement from being mistaken for a system-level fire-performance requirement.
List the installation location and service conditions, including indoor or outdoor use, wet exposure, soil conditions, chemical contact, ultraviolet exposure, and temperature range where relevant. Include the route length, installation grouping, ventilation, and any constraints on pulling or bending. Without this information, a supplier may price a standard construction that does not match the real route.
For longer routes or complex installations, ask for cable mass, outside diameter, pulling limitations, and handling recommendations. Check compatibility with the project’s joints, terminations, glands, and switchgear interfaces. A cable design that meets the electrical rating may still create installation issues if its dimensions or accessories are not coordinated early.
Send all bidders the same technical schedule and ask them to return a completed compliance table. Compare voltage rating, conductor material and size, insulation, screens, sheath, armour, standard, test documentation, and stated deviations. A low quotation is difficult to evaluate if the proposed construction or included accessories are unclear.
Before purchase, confirm the order quantity, cable length per drum, drum dimensions, marking, packaging, delivery point, and required documents. Ask which tests and inspection records are included and when they will be supplied. If the project has approval or inspection hold points, agree on these requirements before production rather than after the cable is ready to ship.
At Chuangjin Cable, we can review your project requirements and prepare a proposal for LSZH XLPE medium voltage cable based on the information provided. For an efficient technical review, share the system voltage, applicable standard, conductor material and size, installation method, required screening and armour, LSZH criteria, and estimated quantity. Drawings, route details, and project-specific schedules can help clarify construction and delivery needs.
We recommend resolving technical questions before commercial comparison is finalized. Our team can identify information needed to evaluate the requested design and provide the available product and documentation details for your review. Final selection should be approved by the project’s responsible electrical engineer and checked against local regulations and the complete installation design.
To choose an LSZH XLPE medium voltage cable, first confirm voltage rating and governing standard, then calculate conductor requirements for load, voltage drop, and fault duty. Match the screening, armour, sheath, and LSZH performance to the route and project safety requirements, and verify dimensions and accessory compatibility. The best next step is to send a complete technical schedule to Chuangjin Cable for a documented proposal that your engineering team can compare and approve.
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