NA2XBY – YJLV62 (AL/XLPE/STA/PVC) Single Core

Single-core NA2XBY Cable is designed as a steel-tape armoured low-voltage power cable for fixed installation where additional mechanical protection is required and where reduced cable weight is preferred. It consists of an aluminium conductor, XLPE insulation, an inner PVC bedding, double non-magnetic steel-tape armour and a PVC outer sheath, allowing the cable to be installed in conditions involving mechanical stress, crushing risk or rodent exposure, such as direct burial in stony soil, in tunnels or in heavy industrial environments.

Cable Construction

• Conductor: Plain aluminium or aluminium alloy, class 1 (solid) or class 2 (stranded), constructed according to IEC 60228.
• Insulation: Extruded cross-linked polyethylene (XLPE), suitable for a maximum conductor temperature of 90 °C in normal operation.
• Inner covering (bedding): Extruded PVC applied over the insulation, providing a separation layer and a bed for the armour.
• Armour: Two helically-applied non-magnetic steel tape layers, with the outer tape approximately centred over the gap of the inner tape, in accordance with IEC 60502-1 Clause 12.7.
• Outer sheath: Extruded PVC applied over the armour, providing mechanical, moisture and chemical protection.

NA2XBY Cable Designations

For standard single-core NA2XBY cable, the key distinction is the combination of a single aluminium conductor with XLPE thermoset insulation, double non-magnetic steel-tape armour and a PVC outer sheath, rated at 0.6/1 kV (U_m = 1.2 kV) in accordance with IEC 60502-1. The designation NA2XBY itself is defined under VDE 0276-603 in the German cable nomenclature system. Compared with copper-conductor N2XBY, NA2XBY offers significantly lower overall cable weight and reduced material cost, which is particularly valuable for armoured cables where the armour layer already adds substantial mass.

The use of non-magnetic steel tape armour complies with IEC 60502-1 Clause 12.2, which requires the armour of single-core AC cables to be non-magnetic in order to avoid eddy-current and hysteresis losses. Single-core NA2XBY is therefore suitable for both alternating-current and direct-current distribution circuits, while providing the full mechanical protection of a double-tape armoured construction.

Typical Applications

• Low-voltage AC distribution circuits up to 0.6/1 kV with mechanical protection requirements
• DC distribution circuits up to 1.5 kV DC, including traction, rail and industrial drive systems
• Utility and industrial installations where mechanical protection and reduced cable weight are both required
• Direct burial in stony, uneven or aggressive soil
• Cable tunnels, ducts and underground cable channels with rodent risk
• Large-section single-core feeders where weight and cost are critical factors

Internationally, single-core NA2XBY is a 0.6/1 kV single-core aluminium steel-tape armoured XLPE/PVC power cable defined under IEC 60502-1, and is often cross-referenced with designations such as AL/XLPE/STA/PVC 1-core and YJLV22 1× under the Chinese GB standard.