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NS75/NS90 Duplex Unjacketed Overhead Neutral Supported Cable

Our NS75/NS90 Duplex Unjacketed Overhead Neutral Supported Cable provides economical self-supporting overhead distribution. Consisting of an XLPE-insulated aluminum phase conductor (75 mm² or 95 mm²) supported by a bare ACSR or AAAC neutral messenger without an overall jacket, it meets AS/NZS 3560 and utility requirements. The design reduces material costs while delivering high tracking resistance and mechanical strength for spans up to 100m. Excellent UV and moisture performance ensures longevity in exposed conditions. The NS75/NS90 Duplex Unjacketed Overhead Neutral Supported Cable offers low installation effort, minimal sag, and reliable power delivery for 600/1000V networks. Widely favored in Australia and New Zealand for residential, commercial, and rural service drops requiring lightweight, neutral-supported overhead cables with proven compliance and durability in diverse climates.

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Construction

Technical Specifications

Quality Control

Application

Construction

NS75/NS90 Duplex Unjacketed Overhead Neutral Supported Cable Constrution

Standard

NS75/NS90 cables meet or exceed the following standards:
CSA C22.C No. 129
CSA listed NS75 & NS90
Sunlight resistant

Conductor

2, 3, or 4 Aluminum alloy 1350-H19 hard-drawn compact round conductors cabled around a neutral

Insulation

Abrasion, heat, and moisture-resistant cross-linked polyethylene (XLP) insulation rated 90°C/-40°C

Neutral

Compact round ASCR neutral. For sizes 266.8kcmil and greater, ACSR neutral conductors shall be in concentric round stranding

Application

Duplex and Triplex NS75/NS90 Service Drop Cable is intended to deliver single-phase power from the secondary overhead power line or pole-mounted transformer to the service entrance conductors at the user’s building or other structure.

Application Description

Quadruplex NS75/NS90 Service Drop Cable is intended to deliver three-phase power from the secondary overhead power line or pole-mounted transformers to the service entrance conductors at the user’s building or other structure. NS75/NS90 cable may also be used as a pole line secondary with service splices at the pole (also refer to CEC rule 12-318). The NS75/NS90 cable is rated for use on systems having nominal voltages of 600 V or less.

Technical Specifications

NS75/NS90 Duplex Unjacketed Overhead Neutral Supported Cable

Cable Construction	Phase 1	Phase 2	Phase 3
Duplex	Black with print legend	-	-
Triplex	Black with print legend	Black with red stripes	-
Quadruplex	Black with print legend	Black with red stripes	Black with blue stripes

Quality Control

NS75/NS90 Duplex Unjacketed Overhead Neutral Supported Cable

Raw Material Test

NS75/NS90 Duplex Unjacketed Overhead Neutral Supported Cable, raw material testing commences with aluminum phase conductor certification for alloy and mechanical properties. Messenger material (ACSR/AAAC) undergoes galvanization uniformity and conductivity verification. XLPE compound faces Congo red testing, volume resistivity, and tracking analysis per AS/NZS standards. The structured process: receipt documentation review, random sampling, physical/mechanical testing (tensile, yield), chemical spectroscopy confirmation, accelerated aging and tracking trials, and material release decision. This comprehensive evaluation secures premium inputs, forming the base for the NS75/NS90 Duplex Unjacketed Overhead Neutral Supported Cable's phase insulation performance, messenger reliability.

Process inspection

Process inspection during NS75/NS90 Duplex Unjacketed Overhead Neutral Supported Cable manufacturing involves real-time quality checks. Phase conductor forming monitors strand uniformity. XLPE insulation extrusion includes online spark testing and ovality control. Messenger placement verifies coverage and tension balance. No jacket extrusion per design. Critical steps: pre-extrusion compound dryness check, parameter stabilization, real-time eccentricity monitoring, gel fraction sampling, partial discharge intermediate scanning, and defect removal protocols. This multi-stage assurance maintains the NS75/NS90 Duplex Unjacketed Overhead Neutral Supported Cable's precise geometry, reliable messenger support, strong phase insulation adhesion, and AS/NZS compliance throughout production.

Finished Product

Completed NS75/NS90 Duplex Unjacketed Overhead Neutral Supported Cable reels face strict tests. Mandatory routines: DC resistance, high-potential AC test, insulation thickness, messenger resistance, and tracking withstand. Extended tests include heat cycling and water tightness. The sequential process: sample conditioning, voltage ramp application, timed exposure to heat/water, recovery phase inspection, property re-measurement, and documentation. Additional verifications ensure marking permanence and flexibility. Passing all confirms the NS75/NS90 Duplex Unjacketed Overhead Neutral Supported Cable's tracking resistance, messenger effectiveness, mechanical endurance, and suitability for critical overhead neutral-supported applications.

Application

Excellent for single-phase overhead service drops in suburban housing, rural properties, and light commercial sites. Commonly installed from poles to buildings in Australia/New Zealand networks requiring economical, self-supporting neutral-supported cables for reliable power distribution.

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Technical Advantages

● 30+ years of manufacturing experience
● ISO and UL certified production
● Customized cable and transformer solutions

Conductor Stranded Work Shop

CCV Production Line

CCV production 01

Partical Voltage Test Labtoary

Auto-Winding Machine

Oil Chromatography Test Machine

Auto-core cutting machine

Basic Insulation Level Test Labtoary

Auto Laser Cutting Machine

Automatic Desanding Machine

Automatic Dryer Machine

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FAQ From Customers

What are the advantages of power cables and overhead lines?

(1) Reliable operation, because it is installed in a hidden place such as underground, it is less damaged by external forces, has less chance of failure, and the power supply is safe, and it will not cause harm to people;
(2) The maintenance workload is small and frequent inspections are not required;
(3) No need to erect towers;
(4) Help improve power factor.

Which aspects should be considered when choosing the cross section of a power cable?

(1) The long-term allowable working current of the cable;
(2) Thermal stability once short circuited;
(3) The voltage drop on the line cannot exceed the allowable working range.

What are the measures for cable fire prevention?

(1) Use flame-retardant cables;
(2) Use fireproof cable tray;
(3) Use fireproof paint;
(4) Fire partition walls and fire baffles are installed at cable tunnels, mezzanine exits, etc.;
(5) Overhead cables should avoid oil pipelines and explosion-proof doors, otherwise local pipes or heat insulation and fire prevention measures should be taken.

What should be paid attention to during the transportation and handling of cables?

(1) During transportation, loading and unloading, cables and cable reels should not be damaged. It is strictly forbidden to push the cable reels directly from the vehicle. Generally, cables should not be transported and stored flat.
(2) Before transporting or rolling the cable reel, ensure that the cable reel is firm, the cable is wound tightly, the oil pipe between the oil-filled cable and the pressure oil tank should be fixed without damage, the pressure oil tank should be firm, and the pressure indication should meet the requirements.

What inspections should be carried out for the acceptance of cable lines?

(1) The cable specifications should meet the regulations, the arrangement should be neat, no damage, and the signs should be complete, correct and clear;
(2) The fixed bending radius of the cable, the related distance and the wiring of the metal sheath of the single-core power cable should meet the requirements;
(3) The cable terminal and the middle head should not leak oil, and the installation should be firm. The oil pressure of the oil-filled cable and the meter setting should meet the requirements;
(4) Good grounding;
(5) The color of the cable terminal is correct, and the metal parts such as the bracket are completely painted;
(6) There should be no debris in the cable trench, tunnel, and bridge, and the cover should be complete.

How many projects can cable engineering be divided into?

(1) Construction site transportation: including the loading and unloading, transportation and empty vehicle return journey of engineering materials from the warehouse to the construction site.
(2) Local engineering: including road excavation, tunnel, trench construction, etc.
(3) Laying engineering: including laying, intermediate head production, lift cover plate, buried pipe, school tide, tractor head production, etc.
(4) Two-end engineering: including the production and installation of support, suspension bridge and its foundation, the production of terminal heads, the installation of oil pressure and signal devices, and the electrical performance testing of various types.
(5) Stopping works: including the production of oil-filled cable stop heads, the installation of fuel supply tanks, automatic drainage and signal devices, etc.
(6) Grounding engineering: including installation of insulation joints, transposition boxes, protectors, and grounding boxes.

What tests and inspections should be carried out on power cables before laying?

Before laying, check whether the type, specification and length of the cable meet the requirements and whether there is external force damage. Low-voltage cables use a 1000V megohmmeter to remotely measure the insulation resistance, and the resistance is generally not less than 10MΩ. High-voltage cables use a 2500V megger to measure the resistance. Generally not less than 400MΩ.

What are the factors that determine the long-term allowable current carrying capacity of the cable?

(1) The long-term allowable working temperature of the cable;
(2) The heat dissipation performance of the cable itself;
(3) The condition of the cable installation and the heat dissipation conditions of the surrounding environment.

According to the difference of insulation and protective layer, what are the main types of commonly used low-voltage power cables?

(1) Oil-impregnated paper insulated lead-clad (or aluminum-clad) power cable;
(2) Non-drip oil-impregnated paper insulated power cable;
(3) PVC insulated and sheathed power cable;
(4) Cross-linked PVC insulated and PE sheathed power cable;
(5) Cross-linked PVC insulated and sheathed power cable;
(6) Rubber insulated power cables.

What are the requirements for the fire blocking of cable holes?

For larger cable penetration holes, such as the cable penetration floor, etc., when using fireproof blocking materials to block, according to the actual situation, first coat four to six layers of fireproof paint on the cable surface, the length is about 1.5m below the hole, and then use fire-resistant The material is processed into a board-supporting fire-proof blocking material with a certain strength to ensure that it is firm after being blocked and is easy to disassemble and assemble when the cable is replaced. The plugging is dense and non-porous to effectively block smoke and fire.

What are the main properties of the insulation material of the power cable?

(1) High breakdown strength;
(2) Low dielectric loss;
(3) Very high insulation resistance;
(4) Excellent discharge resistance;
(5) It has certain flexibility and mechanical strength;
(6) Long-term insulation performance is stable.

What are the regulations for cable protection tubes?

(1) When the cable needs to be laid through a protective pipe, the inner diameter of the pipe should not be less than 1.5 times the outer diameter of the cable, and the inner diameter of the concrete pipe, clay pipe, asbestos, and cement pipe should not be less than 100mm;
(2) The bending radius of the cable tube should meet the requirements of the bending radius of the cable inserted;
(3) Each pipe should not exceed three elbows at most, and there should be no more than two right-angle bends.

How to measure the outer diameter of the cable sheath?

At five evenly distributed points on the circumference of the sheath, measure the outer diameter of the sheath and its average value. The average outer diameter is the outer diameter of the sheath.

How to connect copper core cables with different cross-sections?

Copper core cables with different cross-sections can be connected by open-back weak copper pipes and connected by soldering, or pure copper rods can be connected into copper pipes according to different cross-sectional requirements and connected by crimping.

What are the insulating materials used to make cable terminal heads or intermediate joints?

There are insulating glue, insulating tape, insulating tube, insulating gloves, insulating resin, etc.

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NS75/NS90 Duplex Unjacketed Overhead Neutral Supported Cable

Construction

Standard

Conductor

Insulation

Neutral

Application

Application Description

Technical Specifications

Quality Control

Raw Material Test

Process inspection

Finished Product

Application

Technical Advantages

Conductor Stranded Work Shop

CCV Production Line

CCV production 01

Partical Voltage Test Labtoary

Auto-Winding Machine

Oil Chromatography Test Machine

Auto-core cutting machine

Basic Insulation Level Test Labtoary

Auto Laser Cutting Machine

Automatic Desanding Machine

Automatic Dryer Machine

Product Packaging

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FAQ From Customers

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