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

Medium voltage unarmoured cable is a power cable without a metallic armour layer, designed to carry electricity at medium voltage when the route and installation method provide suitable mechanical protection. It is commonly considered for indoor cable routes, ducts, cable trays, and other protected installations, subject to local codes and project requirements. To choose the right cable, buyers should confirm the system voltage, conductor and insulation requirements, screening arrangement, environmental conditions, and installation method. At Zhongdong Cable Co., Ltd., we help B2B buyers clarify these requirements before evaluating a cable specification.

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Key Takeaways

• Unarmoured describes the absence of metallic armour; it does not mean the cable has no conductor screen, insulation screen, or metallic screen.
• Use unarmoured cable where the installation route and protective measures are appropriate for its mechanical exposure.
• Specify voltage designation, conductor material and size, insulation, screen, sheath, applicable standard, and any environmental requirements.
• Confirm the cable design against the project specification and the applicable local electrical and installation rules before ordering.

Who This Guide Is For

This guide is intended for electrical contractors, distributors, engineering teams, EPC companies, and procurement professionals evaluating medium voltage cable for a project or supply program. It is useful when comparing unarmoured and armoured constructions, preparing a technical inquiry, or checking whether a proposed cable matches a route’s conditions. The final selection should be reviewed by the project’s qualified electrical designer or other responsible technical authority. Cable names and requirements can vary between markets, so buyers should use the project specification as the controlling document.

What Is Medium Voltage Unarmoured Cable?

Construction and function

A medium voltage cable typically includes a conductor, conductor screen, insulation, insulation screen, metallic screen, and outer sheath, with the exact construction depending on the design and standard. The conductor carries power, while the insulation system and screens are designed to manage the electrical field around it. The outer sheath provides a protective covering, but it is not a substitute for armour where impact or crushing protection is required. An unarmoured design omits the metallic armour layer found in armoured cable constructions.

“Unarmoured” should not be confused with “unscreened.” Medium voltage designs commonly use semiconductive screens and a metallic screen, but the required materials, thicknesses, and configuration must be stated or confirmed in the project specification. The screen’s electrical and earthing arrangements also need to be compatible with the installation design. Buyers should avoid relying on a short product label alone to establish a complete construction.

Voltage Ratings, Materials, and Key Specifications

Confirm the voltage designation

Voltage designations should be selected for the system and confirmed against the applicable standard and project requirements. For example, IEC-style designations commonly include 6/10 (12) kV, 12/20 (24) kV, and 18/30 (36) kV. These are examples of voltage classes, not a recommendation for a particular installation. The responsible designer should verify the nominal system voltage, maximum system voltage, earthing conditions, and required insulation level before specifying a cable.

Compare the complete cable construction

Conductor material and size affect electrical performance, installation, and project cost. Copper and aluminium are not interchangeable on a one-for-one basis; the design should account for the system’s electrical and mechanical requirements. Likewise, a requested insulation material or sheath option should be checked against the governing specification rather than assumed from a generic cable description. Ask the supplier to state the proposed construction clearly so the engineering team can review it.

Applications and Route Suitability

Unarmoured medium voltage cable may be suitable for protected routes in industrial facilities, commercial infrastructure, utility installations, and building services, when the cable design and installation method meet project requirements. Examples include enclosed cable trenches, ducts, and controlled cable tray routes. Suitability depends on the expected mechanical stress, exposure, support and spacing arrangements, and applicable installation rules. The application name alone does not determine whether an unarmoured construction is appropriate.

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For buried routes or locations exposed to impact, construction activity, or other mechanical hazards, the project designer should assess whether additional protection is necessary. That protection may be provided by the cable construction, the installation system, or a combination of measures, as allowed by local requirements. Where a route may be damaged during operation or maintenance, buyers should not select an unarmoured design solely to reduce initial material cost. Review the complete route and protection plan before finalizing the cable.

A Practical Selection Framework

Work through these decision points

1. Define the electrical system. Record nominal and maximum voltage, frequency, earthing arrangement, load requirements, and any relevant fault-current conditions.
2. Describe the route. Identify whether the cable will be installed indoors or outdoors, in air, a duct, a trench, or another system, and note environmental and mechanical exposures.
3. Set the construction. Specify conductor material and size, insulation, screening, sheath, core arrangement, and whether armour or other protection is required.
4. Identify compliance needs. Name the applicable standard and project-specific testing, marking, documentation, and inspection requirements.
5. Check installation constraints. Confirm pulling method, termination compatibility, route dimensions, drum handling, and manufacturer guidance such as minimum bending radius.
6. Review the offer technically. Compare the supplier’s proposed construction and documents line by line against the inquiry, rather than comparing price alone.

These steps help prevent a common procurement problem: a quotation that appears comparable but uses a different voltage designation, screen arrangement, sheath, or testing scope. If a requirement is not stated, ask the supplier to identify the assumption in writing. Technical clarification before production is generally more practical than trying to resolve a construction mismatch after delivery. The responsible project team should approve any deviation.

Pricing, MOQ, and Lead-Time Considerations

The cost of a medium voltage unarmoured cable depends on the specified construction, conductor material and size, voltage class, order quantity, drum length, packaging, testing scope, and delivery destination. Copper and aluminium options may have different material-cost profiles, while project-specific documentation or inspection requirements can affect the quotation. Minimum order quantities and production lead times are supplier- and specification-dependent, so they should be confirmed for each inquiry rather than assumed. Provide a forecast quantity and required delivery schedule when requesting a quotation.

To support a useful commercial comparison, send the complete technical specification, expected quantity, destination, preferred delivery format, and target delivery window. Ask suppliers to separate any technical exceptions from their commercial offer. This makes it easier to evaluate whether differences in price reflect different cable constructions, scope, or delivery terms. Confirm quotation validity and shipping responsibilities directly with the supplier.

Supplier Evaluation Checklist

• Can the supplier provide a clearly written construction description for the proposed cable?
• Does the quotation identify the voltage designation, conductor, insulation, screens, and sheath?
• Can the supplier confirm applicable standards and the requested test and documentation scope?
• Are drum length, markings, packaging, quantity, delivery schedule, and destination requirements addressed?
• Are deviations, exclusions, and items requiring buyer confirmation stated clearly?

At Zhongdong Cable Co., Ltd., we encourage buyers to share their technical specification and route requirements so our team can review the inquiry and discuss a suitable cable configuration. We can clarify requested construction details and commercial information for project evaluation, subject to the scope confirmed for each order. Buyers should verify that the final offer and supporting documents meet their own engineering, regulatory, and procurement requirements. A complete inquiry helps both sides identify open technical questions early.

Conclusion and Next Steps

Medium voltage unarmoured cable is a potential choice for power distribution where the route provides appropriate mechanical protection and the cable design satisfies the electrical and environmental requirements. The key selection priorities are the correct voltage class, conductor and insulation system, screen arrangement, sheath, governing standard, installation method, and protection against route-specific hazards. No single construction is right for every project, so confirm the design with the responsible engineer before purchase. To begin an evaluation with Zhongdong Cable Co., Ltd., provide your specification, application, quantity, destination, and requested delivery schedule for review.