Medium voltage AWA armoured cable is an insulated power cable protected by aluminium wire armour, commonly selected for single-core circuits where mechanical protection is needed and magnetic armour is unsuitable. To specify it correctly, confirm the system voltage, conductor material and size, insulation and screen requirements, installation conditions, and applicable standard before requesting a quotation. IEC 60502-2 covers extruded-insulation power cables rated from 6 kV up to 30 kV, with the relevant voltage designation and design dependent on the project. I use this guide to help buyers compare the main construction options and prepare a clear, project-ready specification.
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This guide is intended for electrical contractors, project engineers, distributors, EPC procurement teams, and industrial buyers sourcing medium voltage cable. It is especially relevant when a project calls for a single-core cable with armour, or when a buyer needs to check whether AWA is suitable for the route and installation method. Final cable design should be reviewed against the applicable regulations, system design, and project requirements. Where requirements are uncertain, share the cable schedule and installation details with the supplier and project engineer before ordering.
AWA stands for aluminium wire armour. In a typical medium voltage design, the cable includes a conductor, conductor screen, XLPE insulation, insulation screen, metallic screen, inner covering or bedding, aluminium wire armour, and an outer sheath. The armour provides mechanical protection and can support the cable’s specified fault-current and earthing design when correctly engineered. The exact construction varies with the cable standard, voltage rating, installation environment, and customer specification.
Aluminium is non-magnetic, which makes AWA a common armour choice for single-core AC cable. Ferromagnetic steel armour around an individual AC phase can experience induced magnetic effects and additional heating, so the armour arrangement needs careful engineering. AWA does not remove the need to assess induced currents, bonding, or sheath losses; those depend on the circuit layout and installation. For multicore cable, steel wire armour may be considered, subject to the design and applicable requirements.
Medium voltage cables are specified using a voltage designation such as U0/U (Um), where the values describe the cable’s rated voltage to earth, between conductors, and the highest system voltage for which it is designed. Examples of common IEC-style designations include 6/10 kV, 8.7/15 kV, 12/20 kV, and 18/30 kV. These examples are not interchangeable: select the rating that matches the system voltage, earthing arrangement, and project standard. XLPE is a widely used insulation material, but its suitability and operating limits must be confirmed in the cable data sheet and design conditions.
Conductors are generally specified as copper or aluminium, with the cross-sectional area selected from the load, voltage-drop, short-circuit, and installation calculations. Copper and aluminium have different electrical and mechanical properties, so buyers should not substitute one for the other without engineering review. The metallic screen—often copper wires or tape in designs that call for it—provides an electrical path for earth-fault current and helps manage the electric field. Its material and cross-section should match the project’s fault level, protection-clearing time, and earthing requirements.
The aluminium wire armour size and arrangement should be specified for the required mechanical protection and electrical duty. The outer sheath protects the cable from environmental exposure during service, with material and colour chosen according to the project specification. If the route involves direct burial, ducts, outdoor exposure, moisture, chemicals, or risk of impact, identify those conditions when selecting the sheath and armour. A supplier quotation should state the proposed construction rather than relying on the term “AWA cable” alone.
AWA armoured cable may be considered for industrial power distribution, utility networks, substations, infrastructure, and other fixed installations requiring medium voltage supply. It is particularly relevant where a single-core AC cable needs mechanical protection and a non-magnetic armour solution. Suitability depends on the complete circuit design, not armour type alone. Route conditions, installation method, short-circuit duty, fire and environmental requirements, and local rules all affect the final selection.
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| Project condition | Specification point to confirm |
|---|---|
| Single-core AC circuit | Armour material, bonding method, phase arrangement, and induced-current assessment |
| Direct burial or damp route | Sheath material, water exposure requirements, and installation protection |
| High fault level | Screen and armour fault-current capacity, protection-clearing time, and earthing design |
| Constrained duct or tray route | Cable dimensions, bending radius, pulling method, and current-carrying capacity |
Start with the nominal system voltage, cable voltage designation, frequency, load current, and earthing arrangement. Ask the project engineer to establish conductor size using load, voltage drop, fault current, and derating calculations. Record the expected short-circuit current and duration because these values can affect the conductor, metallic screen, and armour design. Do not choose a cable solely by matching its conductor size to an existing installation.
State whether the cable will be installed in air, on a tray, in a duct, or directly buried. Provide ambient temperature, soil thermal conditions where applicable, grouping with other circuits, route length, and any exposure to water, chemicals, or mechanical damage. These inputs influence current rating and sheath choice, and can change the practical cable dimensions and handling requirements. Confirm minimum bending radius and pulling limits from the supplier’s technical data for the proposed construction.
Write down conductor material and cross-section, insulation type, metallic screen design, armour type, sheath material, voltage rating, and required standard. Add project-specific requirements for fire performance, colour, marking, drum length, testing documentation, and packing when applicable. State whether the cable is single-core or multicore and identify any required accessories separately. A detailed specification helps suppliers identify omissions and reduces the risk of receiving a technically unsuitable alternative.
Before purchase, compare the supplier’s data sheet with the cable schedule and project requirements. Check cable outside diameter, approximate mass, drum length, conductor and screen details, sheath description, and declared standard. Confirm that joints, terminations, glands, and bonding arrangements are compatible with the selected cable. Request clarification in writing if a quotation includes deviations or substitutions.
Pricing for medium voltage AWA cable depends on the voltage rating, conductor material and size, screen and armour construction, sheath, order quantity, drum configuration, and delivery destination. A minimum order quantity may depend on production planning and the requested design, so buyers should confirm it for the exact specification rather than assume a fixed threshold. Lead time also varies with material availability, production schedule, testing and documentation needs, and shipping arrangements. For a more useful quotation, provide the cable schedule, estimated quantity, delivery location, required delivery date, and any project documents that define compliance.
A frequent mistake is specifying only “medium voltage AWA cable” without voltage designation, conductor size, or installation details. Another is treating armour as a substitute for correct bonding and earthing design, even though those arrangements must be engineered for the circuit. Buyers can also overlook compatibility with cable accessories or fail to account for route conditions that affect current capacity and handling. Resolve these points during technical review rather than after production or delivery.
Medium voltage AWA armoured cable can be a suitable option when a single-core AC circuit requires mechanical protection and a non-magnetic armour arrangement, but the correct design depends on system voltage, fault duty, route, and project standards. Begin by confirming the electrical calculations and installation conditions, then issue a complete construction specification for supplier review. Zhongdong Cable Co., Ltd. can discuss project requirements and prepare a quotation based on the cable schedule, required quantity, and delivery destination. Send your voltage designation, conductor details, installation method, and target delivery date to start a practical technical and commercial review.
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