NA2XS2Y Cable

NA2XS2Y 12/20 kV Reference Data

Recommended reference data. These selected values describe one aluminium single-core construction. They are not guaranteed XWA dimensions, ratings or available sizes; approved manufacturing data and the project rating calculation determine the final specification.

Reference installation: one circuit, touching trefoil, screens earthed at both ends; air 30°C without direct sun; soil 20°C, عمق 0.7 م, المقاومة الحرارية 1.0 K·m/W wet and 2.5 K·m/W dry; no nearby heat sources. Maximum reference conductor temperature: 90درجة مئوية.

The reference uses 5.5 mm nominal insulation. PE sheath thickness is 2.5 mm through the listed 500 mm² size, 2.6 mm at 630 mm² and 2.8 mm at 1000 مم². All dimensions and mass are construction-specific.

Phase Size, Screen Area and Complete Cable Mass

The notation 1×240/25 describes one 240 mm² aluminium phase conductor and a separately specified 25 mm² metallic screen. It does not describe two load-carrying cores. The screen requirement follows its own fault-current duty and the circuit bonding design, rather than a fixed percentage of phase area.

For that selected 240/25 reference, overall diameter is approximately 39 mm and mass is 1.671 كجم/م. أ 500 m cable length therefore represents approximately 835.5 kg of cable, before the drum, protective wrapping and other packing. The aluminium mass alone is not the shipment or pulling mass.

A larger aluminium section can change the complete cable diameter, cable-entry dimensions and handling load. Replacing a copper cable is consequently not a name-only substitution: التصنيف الحالي, انخفاض الجهد, conductor connections and accessory dimensions all remain part of the circuit specification.

Aluminium Connections and Copper Screening

A copper wire screen does not make NA2XS2Y a copper-conductor cable. The aluminium is inside the insulation and carries phase current; the copper screening lies outside the semiconductive insulation screen. This distinction matters at the cable end, where the conductor connector and the screen connection are different interfaces.

Conductor lugs and connectors must be suitable for the aluminium material, conductor form and size. Connections to copper equipment require a compatible transition system. Surface preparation, jointing compound where specified, tool selection and tightening or crimping procedure follow the connector manufacturer’s instructions; the cable name alone does not define them.

Termination kits also have an insulation-diameter range. A kit selected only from conductor area can miss that range. For the selected 240/25 بناء, the reference insulation diameter is approximately 30.4 مم; it is different from the 39 mm overall diameter used for the outer cable entry.

بي, PVC and Water-Blocked Alternatives

The PE sheath provides the declared outer protection, but it is not a substitute for an additional water-blocking system or mechanical armour. Black colour alone cannot identify PE versus PVC. The construction specification and material records establish the sheath type.

Halogen content and flame propagation are separate properties. The basic PE reference must not be described as flame-retardant LSZH solely because polyethylene contains no halogen. Routes inside buildings or tunnels with enhanced fire requirements need the specified fire-performance construction and test evidence.

Underground Routes and Fixed Distribution

NA2XS2Y is used in fixed underground networks, القنوات, cable-management systems and industrial distribution where its declared sheath and installation requirements fit the route. Ground conditions determine whether direct burial is appropriate; صخر, تأثير, excavation exposure or concentrated loads can require additional protection.

Three separate single-core cables supply the phases of a circuit. Flat and trefoil arrangements do not share a universal current rating. تباعد, adjacent circuits and the screen-bonding arrangement change the thermal and electrical conditions. The values above apply only to their stated reference; a duct bank or a different bonding arrangement requires the applicable rating assessment.

Pulling design uses the complete cable geometry, the selected pulling method and the limiting cable/accessory requirements. A bend limit from another voltage grade or sheath design must not be transferred unchanged. The supporting article on نصف قطر انحناء الكابل MV وسحب التوتر explains those route-dependent constraints.

Manufacturing Definition and Test Scope

The manufacturing definition identifies conductor material and form, أبعاد العزل والغلاف, the metallic-screen arrangement, voltage designation and applicable tests. The relevant schedule covers resistance, insulation and discharge performance, as well as the oversheath requirements of the agreed design.

HD/VDE and IEC references describe requirements, not automatic certification or utility approval. ال official publication scope concerns fixed-distribution cables; it does not by itself qualify this construction for submarine, shipboard or special mining service. Separate water-blocking or fire-performance claims also need their corresponding design and evidence.