Anhui Feichun Special Cable Co.,Ltd Li.wang@feichuncables.com

BS 6724 Multicore Sectoral Shaped XLPE SWA LSZH 1.9/3.3 kV Cable
BS 6724 Sectoral Shaped Copper Conductor Multi Core SWA 1.9/3.3 kV Cable
BS 6724 1.9/3.3kV Sector Shaped Cable Specifications
Application
The BS 6724 1.9/3.3kV sector shaped cable is suitable for direct burial free-draining soil conditions for fixed indoor and outdoor installations. Low level of smoke emission and corrosive gasses in case of fire.
Characteristics
Voltage Rating Uo/U: 1.9/3.3kV
Test Voltage:
Between conductors: 11.25kV
Between each conductor and armour: 6.50kV
Temperature Rating:
Maximum Operating: +90ºC
Maximum Short-Circuit: +250°C
Minimum Bending Radius: 8 x overall diameter
Construction
Conductor: Class 2 sectoral shaped stranded copper
Insulation: XLPE (Cross-Linked Polyethylene)
Filler: HFFR (Halogen free flame retardant)
Armour: SWA (Galvanised round steel wire armour)
Outer Sheath: HFFR (Halogen free flame retardant)
Core Identification: Brown, Black, Grey
Sheath Colour: Black
Standards
BS 6724, EN 60228, IEC 60502-1
Flame retardant to EN 60332-1
Low Smoke Halogen Free to IEC/EN 61034-1/2, IEC/EN 60754-1/2
UV Resistant
Dimensions
NO. OF CORES | NOMINAL CROSS SECTIONAL AREA (mm²) | NOMINAL THICKNESS OF INSULATION (mm) | MINIMUM THICKNESS OF OUTER SHEATH (mm) | NOMINAL OUTER DIAMETER (mm) | NOMINAL WEIGHT (kg/km) | |
---|---|---|---|---|---|---|
B9L0335SBK | 3 | 35 | 2.0 | 1.32 | 28 | 2124 |
B9L0350SBK | 3 | 50 | 2.0 | 1.40 | 33 | 2930 |
B9L0370SBK | 3 | 70 | 2.0 | 1.48 | 36 | 3739 |
B9L0395SBK | 3 | 95 | 2.0 | 1.56 | 40 | 4734 |
B9L03120SBK | 3 | 120 | 2.0 | 1.64 | 44 | 6047 |
B9L03150SBK | 3 | 150 | 2.0 | 1.72 | 48 | 7196 |
B9L03185SBK | 3 | 185 | 2.0 | 1.80 | 51 | 8565 |
B9L03240SBK | 3 | 240 | 2.0 | 1.88 | 57 | 10645 |
B9L03300SBK | 3 | 300 | 2.0 | 1.96 | 62 | 12709 |
Electrical Characteristics
NOMINAL CROSS SECTIONAL AREA (mm²) | CURRENT CARRYING CAPACITY (A) | MAXIMUM CONDUCTOR DC RESISTANCE AT 20°C (Ω/km) | |||||
---|---|---|---|---|---|---|---|
Clipped direct | Direct in ground or in ducting in ground, in or around buildings at 20°C | In free air or on a perforated cable tray etc, horizontal or vertical at 30°C | |||||
1 two-cable, single-phase a.c or d.c | 1 three or 1 four core cable, three-phase a.c or d.c | 1 two-cable, single-phase a.c or d.c | 1 three or 1 four core cable, three-phase a.c or d.c | 1 two-cable, single-phase a.c or d.c | 1 three or 1 four core cable, three-phase a.c or d.c | ||
1.5 | 27 | 23 | 29 | 25 | 25 | 21 | - |
2.5 | 36 | 31 | 39 | 33 | 33 | 28 | - |
4 | 49 | 42 | 52 | 44 | 43 | 36 | - |
6 | 62 | 53 | 66 | 56 | 53 | 44 | - |
10 | 85 | 73 | 90 | 78 | 71 | 58 | - |
16 | 110 | 94 | 115 | 99 | 91 | 75 | - |
25 | 146 | 124 | 152 | 131 | 116 | 96 | - |
35 | 180 | 154 | 188 | 162 | 139 | 115 | 0.524 |
50 | 219 | 187 | 228 | 197 | 164 | 135 | 0.387 |
70 | 279 | 238 | 291 | 251 | 203 | 167 | 0.268 |
95 | 338 | 289 | 354 | 304 | 239 | 197 | 0.193 |
120 | 392 | 335 | 410 | 353 | 271 | 223 | 0.153 |
150 | 451 | 386 | 472 | 406 | 306 | 251 | 0.124 |
185 | 515 | 441 | 539 | 463 | 343 | 281 | 0.0991 |
240 | 607 | 520 | 636 | 546 | 395 | 324 | 0.0754 |
300 | 698 | 599 | 732 | 628 | 446 | 365 | 0.0601 |
Air ambient temperature: 30ºC
Ground ambient temperature: 20ºC
Conductor operating temperature: 90ºC
Notes
1. Where a conductor operates at a temperature exceeding 70ºC it must be ascertained that the equipment connected to the conductor is suitable for the conductor operating temperature (see Regulation 512.1.2 of the 18th Edition of IEE Wiring Regulations).
2. Where cables in this table are connected to equipment or accessories designed to operate at a temperature not exceeding 70ºC, the current ratings given in the equivalent table for 70ºC thermoplastic insulated cables (Table 4D4A) must be used (see also Regulation 523.1 of the 18th Edition of IEE Wiring Regulations).
The above table is in accordance with Table 4E4A of the 18th Edition of IEE Wiring Regulations BS7671 and IEC 60364-5-52.
Introduction to BS 6724 Cable
The BS 6724 Sectoral Shaped Copper Conductor Multi-Core SWA 1.9/3.3kV Cable is a robust, high-performance power cable designed for demanding electrical installations. Engineered to meet stringent industry standards, this cable is pivotal in applications requiring reliable power transmission under challenging conditions. Its unique construction, featuring sectoral-shaped copper conductors, steel wire armour (SWA), and halogen-free flame-retardant (HFFR) materials, makes it a preferred choice for both indoor and outdoor installations, particularly in environments where safety and durability are paramount.
Technical Specifications of BS 6724 Cable
Construction and Materials
The BS 6724 cable is meticulously designed to ensure optimal performance and safety. Its key components include:
Conductor: Class 2 sectoral-shaped stranded copper, which maximizes conductivity while optimizing space within the cable. The sectoral shape reduces the overall diameter compared to round conductors, making it easier to handle in multi-core configurations.
Insulation: Cross-Linked Polyethylene (XLPE), offering excellent electrical insulation and thermal resistance, capable of operating at temperatures up to 90°C.
Filler and Outer Sheath: Halogen-Free Flame Retardant (HFFR) materials, which minimize smoke and corrosive gas emissions in case of fire, enhancing safety in confined spaces.
Armour: Galvanised Steel Wire Armour (SWA), providing mechanical protection against physical damage, making it suitable for direct burial and harsh environments.
Core Identification: Brown, Black, and Grey cores for easy identification in three-core configurations.
Sheath Colour: Black, with UV resistance to withstand prolonged exposure to sunlight.
The cable’s construction adheres to standards such as BS 6724, EN 60228, and IEC 60502-1, ensuring compliance with global benchmarks for quality and safety. It is also flame-retardant (EN 60332-1) and low-smoke halogen-free (IEC/EN 61034-1/2, IEC/EN 60754-1/2), making it ideal for environments where fire safety is critical.
Applications and Usage Scenarios
The BS 6724 cable is versatile, suitable for both indoor and outdoor fixed installations. Its key applications include:
Direct Burial: The SWA and UV-resistant sheath make it ideal for direct burial in free-draining soil, commonly used in underground power distribution networks.
Industrial Settings: Its high current-carrying capacity and mechanical protection suit it for heavy-duty industrial applications, such as factories and mining operations.
Public Infrastructure: The low-smoke, halogen-free properties make it a preferred choice for public buildings, tunnels, and metro systems where fire safety is critical.
Renewable Energy Projects: The cable’s reliability and durability support connections in solar farms and wind energy installations.
In South Africa, where energy infrastructure is undergoing significant upgrades to address load-shedding and integrate renewable energy, the BS 6724 cable plays a vital role. Its ability to handle high voltages and currents, combined with its safety features, makes it suitable for modernizing the national grid and supporting sustainable energy initiatives.
Frequently Asked Questions
What makes the BS 6724 cable suitable for direct burial?
The cable’s galvanised steel wire armour provides mechanical protection, while its UV-resistant HFFR sheath ensures durability in free-draining soil conditions.Can the BS 6724 cable be used in high-temperature environments?
Yes, it can operate at temperatures up to 90°C, with a maximum short-circuit temperature of 250°C. However, equipment connected to the cable must be rated for these temperatures.Why is the low-smoke, halogen-free feature important?
In case of fire, HFFR materials emit minimal smoke and corrosive gases, enhancing safety in enclosed spaces like tunnels and public buildings.What is the significance of the sectoral-shaped conductor?
The sectoral shape reduces the cable’s overall diameter, making it more compact and easier to install in multi-core configurations.How does the BS 6724 cable support South Africa’s energy goals?
Its reliability and safety features make it ideal for upgrading aging infrastructure and integrating renewable energy sources, addressing load-shedding and sustainability challenges.
The BS 6724 Sectoral Shaped Copper Conductor Multi-Core SWA 1.9/3.3kV Cable is a cornerstone of modern electrical infrastructure, offering unmatched reliability, safety, and versatility. Its technical specifications, including high current-carrying capacity, robust construction, and compliance with international standards, make it a go-to solution for demanding applications. In South Africa, where energy challenges and sustainability goals are driving infrastructure upgrades, this cable is playing a pivotal role in rural electrification, renewable energy projects, and urban safety initiatives.

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