N2xh N2xh-J N2xh-O Cable N2xh-O Black 4 X 25 RM mm2 0.6/1kv Power Cable

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2025-07-25 06:53:46

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Details of N2xh Series Cable Products

I. Core Information of the Product Itself

(I) Detailed Explanation of Specification Parameters

Basic Specification Description

The N2xh series cables include three core models: N2xh, N2xh-J, and N2xh-O. Among them, N2xh-O has a black appearance, with a core specification of 4×25mm² and a rated voltage of 0.6/1kV. They are high-performance Power Cables suitable for low-voltage power distribution scenarios.

"4×25mm²" indicates a four-core independent insulation structure. Each core conductor is individually covered with an insulation layer and then integrated into a whole, which can avoid signal interference between core wires. The cross-sectional area of a Single Core is 25mm², corresponding to a conductor diameter of approximately 5.6mm (calculated by the circular area formula), and the overall structure of the four cores is compact after being 并拢.

Under the conditions of an ambient temperature of 25°C and laying in the air, the long-term allowable current-carrying capacity of this specification is 85A. Calculated according to the three-phase power formula P=√3×0.38kV×I×0.85 (cosφ=0.85), it can carry a load of about 45kW, which is suitable for scenarios such as small and medium-sized industrial equipment (such as small air compressors and conveyor belts), building power distribution branches (such as independent circuits of commercial stores), and outdoor lighting main lines. The overall outer diameter of the cable is about 22mm, and the bending radius is 10 times the outer diameter (about 220mm), which can be laid smoothly in narrow spaces such as corners and pipes.

Safety and Performance Parameters

The DC resistance of the conductor is ≤0.727Ω/km (at 20°C), ensuring that the line loss during power transmission is lower than the industry average (about 5% lower than ordinary cables). The insulation resistance is ≥100MΩ·km (at 20°C). There is no breakdown in the power frequency withstand voltage test at 3kV for 5 minutes, and the partial discharge capacity is ≤10pC (under 1.73U0), meeting the requirements of GB/T 12706.1-2020. The tensile strength of the sheath is ≥12MPa, and the elongation at break is ≥125%. After 1000 bending tests (bending radius 220mm), there is no crack and the insulation performance does not decrease. Due to the enhanced outdoor performance, N2xh-O additionally passes the ultraviolet resistance test (irradiated by UVB-313 lamp for 1000h, and the sheath has no cracks or discoloration).

(II) Material and Structural Design

Core Material Composition

Conductor: All series use high-purity electrolytic copper (copper content ≥99.95%), and adopt 19 strands of φ0.8mm fine Copper Wire stranded (Class 2 conductor structure). The copper wires are annealed (420°C×2h), with a smooth surface and no oxide layer, and the conductivity reaches more than 58MS/m. The multi-strand stranded design increases the Flexibility of the conductor by 30%, which is not easy to produce plastic deformation when bending, and is suitable for laying scenarios with frequent movement or bending (such as wiring at the base of outdoor lamp poles).

Insulation Layer: All use weather-resistant cross-linked polyethylene (XLPE) with a thickness of 1.2mm. The basic model N2xh is added with conventional antioxidants; N2xh-J, in order to improve stability, is mixed with 0.5% nano-calcium carbonate in XLPE to optimize dielectric properties (dielectric constant fluctuation ≤±0.2); N2xh-O is additionally added with ultraviolet absorber (UV-531), which can absorb ultraviolet rays with a wavelength of 280-340nm and delay the aging rate. The long-term working temperature of the three Insulation Materials is 90°C, and the short-term overload (within 2h) can reach 130°C.

Sheath: N2xh and N2xh-J use black PVC Sheaths (thickness 1.2mm), and carbon black (content 2%) is added to improve weather resistance; N2xh-O is upgraded to a black weather-resistant PE sheath (thickness 1.4mm), and maleic anhydride graft is mixed to improve the adhesion with the insulation layer. At the same time, it has an IP65 waterproof rating (insulation resistance does not decrease significantly after soaking in 1m underwater for 24h). The surface of the sheath is matte treated to reduce local temperature rise caused by outdoor sunlight reflection.

Structural Advantages

The cable adopts a four-layer structure of "conductor → XLPE insulation → filling layer → sheath": The conductor and the insulation layer are closely bonded through the extrusion process (no bubble gap), and the surface of the insulation layer is corona treated to improve the bonding force with the sheath; The four cores are arranged symmetrically (120° distribution), and the gaps are filled with polypropylene ropes (diameter 1.5mm) to ensure roundness (ellipticity ≤5%); The sheath and the filling layer are tightly wrapped to form a continuous protective barrier.

This structure enables the cable to have triple protection: The insulation layer blocks current leakage, the filling layer buffers mechanical impact, and the sheath resists external wear. N2xh-J further reduces the risk of partial discharge by optimizing the insulation layer formula, and N2xh-O strengthens the adaptability to outdoor environments through thickened sheaths and waterproof designs. The three models achieve precise adaptation to general, stable, and weather-resistant scenarios respectively.

(III) Characteristic Uses and Scene Adaptation

Application Scenarios by Model

N2xh (basic model): Suitable for dry indoor and mild outdoor scenarios, such as power supply for workshop equipment (non-open-air areas) and power distribution branches for office building floors. Its balanced performance can meet the needs of most conventional environments, and the cost is relatively moderate.

N2xh-J (stable model): Focuses on low partial discharge characteristics, and is suitable for scenarios with high requirements for power supply stability, such as precision instruments (laboratory incubators) and power incoming lines of PLC control cabinets. In areas with large voltage fluctuations (such as industrial areas), it can reduce insulation aging caused by discharge.

N2xh-O (weather-resistant model): Specifically designed for outdoor use, it is used in municipal road lighting main lines (street lamp spacing within 30m), outdoor substation outgoing lines (non-direct burial sections), and landscape lamp power supply lines. Its waterproof and sun-resistant characteristics can cope with natural factors such as rain, snow, and ultraviolet rays, and the outdoor service life can reach 8 years (about 5 years for ordinary cables).

Advantages of Scene Adaptation

In an environment with a temperature of -15°C to 40°C, all three cables can operate stably; N2xh-O can withstand a low temperature of -30°C (no cracks in the low-temperature bending test), and is suitable for cold regions in the north. In factory workshops with a lot of dust, the smooth sheath surface is not easy to accumulate dust, reducing regular cleaning costs; In humid outdoor green belts, the waterproof sheath of N2xh-O can prevent water vapor from entering the insulation layer.

In view of the differences in laying methods, this series is also suitable: When laid openly (such as cable trays), the wear resistance of the sheath can resist slight collisions; When laid through pipes (such as PVC pipes), the Flexible Conductor and insulation layer can reduce damage caused by friction with the pipe wall; When overhead outdoors (such as between lamp poles), N2xh-O has better wind swing resistance (no fatigue damage after 10m/s wind speed simulation test).

(IV) Production Process and Quality Control

Key Production Processes

Conductor Stranding: A cage stranding machine is used, with a stranding pitch of 25mm (10 times the conductor diameter) to ensure that the strands are closely bonded without loosening. After stranding, online tension detection is carried out (tension fluctuation ≤±5N) to avoid conductor eccentricity caused by uneven tension.

Insulation Extrusion: A Φ65 extruder is used, the melting temperature of XLPE material is 190-210°C, and the extrusion speed is 12m/min. The insulation thickness is monitored in real-time by a laser thickness gauge (deviation ≤±0.1mm), and it is cooled in sections in a cooling water tank (water temperature gradually decreases from 60°C to 25°C) to reduce internal stress. N2xh-O additionally adds an ultraviolet absorber mixing process (stirring for 15min to ensure uniform dispersion) in this link.

Cabling and Sheath: When four cores are cabled, active pay-off is adopted (pay-off tension 30N). After filling with polypropylene ropes, non-woven fabrics are wrapped (overlap rate 20%) for fixation; When extruding the sheath, the temperature of the PVC sheath is 170-180°C, and the temperature of the PE sheath is 180-200°C. After extrusion, it is shaped by spray cooling (water pressure 0.2MPa) to ensure that the sheath surface is smooth and free of bubbles.

Finished Product Inspection: Immediately after extrusion, a spark test (15kV voltage) is carried out to detect pinhole defects; Samples are taken every 100m for insulation resistance and partial discharge tests. N2xh-J needs to additionally pass the partial discharge verification under 1.73U0 (≤5pC).

Quality Inspection Standards

Each batch of cables must pass 12 mandatory tests:

Electrical performance: Conductor resistance, insulation resistance, power frequency withstand voltage, partial discharge capacity;

Mechanical performance: Sheath tensile strength, insulation elongation, bending test;

Environmental adaptability: Heat aging (80°C×168h performance retention rate ≥80%), ozone resistance (200ppm×72h no cracks).

N2xh-O adds ultraviolet resistance and waterproof tests. All test data are archived (stored for 5 years), and a test report (including batch number for traceability) is attached with the goods.

II. Description of General Product Information

(I) Packaging Specifications

Packaging Form

Two packaging methods are adopted: Short-length cables less than 200m are packaged in hard paper tubes (diameter 250mm, length 300mm), with moisture-proof paper lined on the inner wall of the paper tubes, and sealed with plastic end caps at both ends (waterproof grade IP54); Long-length cables of 200m and above use steel-wood structure cable reels (diameter 1.2m, width 350mm), and each reel can hold 500m of cables (weight about 180kg).

White identification labels are pasted on the outside of the package, indicating: Model (such as "N2xh-O 4×25mm²"), length, rated voltage, production date (accurate to the day), batch number, and the warning sign of "Avoid sunlight and rain". Due to its outdoor use, N2xh-O is additionally marked with "weather-resistant" and waterproof grade on the label. Both the paper tubes and cable reels are attached with product qualification certificates (stamped with quality inspection seal), listing key test data (such as the measured value of insulation resistance).

Protection Design

The wooden part of the cable reel is painted with anti-corrosion paint (salt spray resistance 500h), and the outer side is wrapped with two layers of 0.12mm thick waterproof film (lap width 50mm); The gaps at both ends of the paper tube are filled with sealant (temperature resistance -40°C to 80°C). 8mm thick iron sheet guard rings (height 80mm) are added to the edge of the cable reel to prevent sheath wear caused by collision during transportation; A Φ50mm shaft hole is reserved in the central axis, equipped with a galvanized lifting ring (material Q235) with a load-bearing capacity of 1t, which is suitable for loading and unloading by forklifts and cranes.

(II) Transportation and Storage Requirements

Transportation Specifications

Road Transportation: Use a fence truck. Place the cable reel flat in the carriage (stack no more than 2 layers), bind it with Φ8mm steel wire ropes (at least 4 binding points per reel), and place 5mm thick rubber pads at the contact points (to avoid sheath wear). Cables packaged in paper tubes are transported in boxes (cartons lined with foam), and the boxes are filled with buffer cotton to prevent shaking.

Loading and Unloading Requirements: When hoisting the cable reel, hoist from the central axis (oblique hoisting is prohibited, and the inclination angle ≤10°), and place it gently when landing (drop ≤10cm); Paper tube packaging needs to be manually carried (single tube weight ≤20kg), and throwing is prohibited.

Extreme Weather: Cover with a rain cloth (waterproof grade PU2000mm) during rainy days, and cover the top of the carriage with a sunshade net during high-temperature (≥35°C) transportation to avoid sheath softening due to high temperature.

Storage Conditions

It should be stored in a dry and ventilated warehouse (humidity ≤70%), and 10cm high wooden pads are laid on the ground (to isolate ground moisture). Cable reels must be placed separately (spacing ≥30cm), away from heat sources (distance ≥1m), corrosive substances (such as acid and alkali solutions), and open flames. Paper tube packaging should be stored upright (inclination angle ≤5°) to avoid extrusion deformation.

The storage period is 2 years. During this period, sampling inspection is carried out every 3 months: Observe whether the sheath is cracked or discolored, and measure the insulation resistance (≥100MΩ·km). N2xh-O needs to additionally check the waterproof performance (no mildew spots or bulges on the surface). Cables stored beyond the period can be used only after re-inspection and qualification.

(III) Delivery and Sample Services

Delivery Process

Order Processing: There are 5000m of spot goods for conventional models (N2xh, N2xh-O), and goods preparation is completed within 24 hours after order confirmation; N2xh-J is a customized model with a production cycle of 3-5 days (needs to be confirmed in advance).

Logistics Selection: Send special line logistics within 500km (arrival in 2-3 days), and send a full truckload for more than 500km (arrival in 4-5 days). Send logistics information (including order number and estimated arrival time) to the customer's designated contact information within 2 hours after shipment.

Arrival Reminder: 24 hours before the logistics shows that the goods are about to arrive, remind the customer to prepare unloading tools (such as forklifts) through SMS + phone calls, and inform the acceptance precautions (such as checking the integrity of the package).

Sample Policy

1m long samples can be provided for free (limited to 2 sections/model), including complete structure and black sheath appearance. Sample applications need to be submitted through official channels (official website/customer service), providing company name, purpose, and contact information. Samples are sent by SF Express (freight collect), attached with material test reports (including copper purity, insulation weather resistance, etc.). If customers need destructive testing (such as cross-sectional analysis), testing method guidance can be provided.

(IV) After-Sales Service Guarantee

Quality Commitment

The product warranty period is 2 years (from the date of delivery). If there are non-human quality problems (such as insulation breakdown, sheath cracking) within the warranty period, the same model of cable will be replaced for free and the round-trip freight will be borne; For damages caused by improper laying (such as too small bending radius), overload (current >85A) and other human factors, paid maintenance services (material fee + labor fee) are provided, and the charging standard is transparent (attached with "Maintenance Price List").

Problem Handling

Response Time: Respond within 2 hours during working hours (8:00-18:00) and within 4 hours during non-working hours. Customer service personnel record the problem and initially judge the cause.

Solutions: For slight sheath damage (area ≤10mm²), a repair kit (including special PE tape, sealant, and instructions for use) will be sent for free; For serious quality problems, a replacement plan will be determined within 48 hours, and urgent orders will be prioritized for production.

On-site Support: When technical personnel need to be present, they will arrive in adjacent provinces within 24 hours and in remote provinces within 48 hours (except special areas) to assist in troubleshooting laying or use problems.

Additional Services

Technical Support: Provide "Current-Carrying Capacity Correction Table" (including current adjustment values under different ambient temperatures and laying methods) and "Outdoor Laying Construction Guide" (including fixed spacing and lightning protection and grounding suggestions), which can be downloaded through the official website or sent by email.

Installation Guidance: Provide free wiring videos (including insulation layer stripping and terminal head production steps), and recommend suitable terminal accessory brands and models (such as cold-shrink terminal heads).

Regular Return Visits: Return visits to the use situation 1 month after arrival, remind to carry out insulation resistance testing 1 year later (provide a list of cooperative testing institutions), and remind to renew the warranty or test 1 month before the expiration of the 2-year warranty period.

III. Summary of Product Advantages

The N2xh series cables take the 4×25mm² specification as the core, and realize precise adaptation to scenarios through model subdivision: The basic model N2xh meets general needs, the stable model N2xh-J ensures power supply for precision equipment, and the weather-resistant model N2xh-O is suitable for harsh outdoor environments. The 25mm² cross-sectional area balances power and cost, the