Thermosetting insulated, twin, 3-core, 4-core and 5-core circular sheathed cables

Application and Description

These cables are designed for fixed wiring purposes in domestic and industrial power/lighting applications. Can be used in trunking or conduit, or may be surface mounted when used for earthing. and generally in areas (such as public and government buildings) where smoke and toxic fumes may cause a threat to life and equipment. The cables produce no corrosive gasses when burnt which is particularly important where electronic equipment is installed.

Cable Construction

  • Fine bare copper strands
  • Strands to IEC 60228 Cl-1 or 2
  • Thermosetting core insulation type EI5 or GP 8
  • The cores shall be twisted together. A centre filler may be used.
  • The twisted core shall be covered by an extruded inner covering or separating tape
  • LSOH sheath, type LTS 4
BS7211 Cables BS7211 Cables

Insulation Colour

Twin brown and blue
3-core brown, black and grey
4-core blue, brown, black and grey
5-core green/yellow, blue, brown, black and grey

Technical Characteristics

Working voltage 450/750v
Test voltage 2500 volts
Flexing bending radius 15 x Ø
Static bending radius 10 x Ø
Flexing temperature -25 ºC to +90 ºC
Short circuit temperature +250 ºC
Flame retardant IEC 60332.1
Insulation resistance 10 MΩ x km
  Smoke density acc. to EN 50268 / IEC 61034
  Corrosiveness of combustion gases acc. to EN 50267-2-2, IEC 60754-2
Flame test Flame-retardant acc. to EN 50265-2-1, IEC 60332.1

Cable Parameter

Two Cores

AWG No. of Cores x Nominal Cross Sectional Area Nominal thickness of insulation Nominal thickness of inner covering Nominal thickness of sheath Nominal overall diameter Nominal Weight Minimum insulation resistance at 90 °C
# x mm² mm mm mm mm kg/km MΩ·km
17 2 × 1.0 0.7 0.4 1.2 7.9-9.5 94 0.011
17(7/26) 2 × 1.0 0.7 0.4 1.2 8.1-9.7 110 0.011
16 2 × 1.5 0.7 0.4 1.2 8.4-10.1 121 0.011
16(7/24) 2 × 1.5 0.7 0.4 1.2 8.5-10.3 132 0.010
14 2 × 2.5 0.7 0.4 1.2 9.1-11.0 165 0.0092
14(7/22) 2 × 2.5 0.7 0.4 1.2 9.3-11.3 178 0.0084
12 2 × 4.0 0.7 0.4 1.2 10.0-12.1 212 0.0077
12(7/20) 2 × 4.0 0.7 0.4 1.2 10.3-12.4 232 0.0070
10 2 × 6.0 0.7 0.4 1.2 10.9-13.2 272 0.0065
10(7/18) 2 × 6.0 0.7 0.4 1.2 11.3-13.7 302 0.0059
8 2 × 10 0.7 0.4 1.4 12.9-15.5 446 0.0053
8(7/16) 2 × 10 0.7 0.6 1.4 13.8-16.7 490 0.0047
6(7/14) 2 × 16 0.7 0.6 1.4 15.6-18.8 674 0.0039
4(7/12) 2 × 25 0.9 0.8 1.4 19.2-23.2 1040 0.0039
2(7/10) 2 × 35 0.9 0.8 1.6 21.5-26.0 1130 0.0034

Three Cores

AWG No. of Cores x Nominal Cross Sectional Area Nominal thickness of insulation Nominal thickness of inner covering Nominal thickness of sheath Nominal overall diameter Nominal Weight Minimum insulation resistance at 90 °C
# x mm² mm mm mm mm kg/km MΩ·km
17 3 × 1.0 0.7 0.4 1.2 8.3-10.0 110 0.011
17(7/26) 3 × 1.0 0.7 0.4 1.2 8.8-10.2 128 0.011
16 3 × 1.5 0.7 0.4 1.2 8.8-10.6 143 0.011
16(7/24) 3 × 1.5 0.7 0.4 1.2 9.0-10.9 156 0.010
14 3 × 2.5 0.7 0.4 1.2 9.6-11.6 198 0.0092
14(7/22) 3 × 2.5 0.7 0.4 1.2 9.8-11.9 213 0.0084
12 3 × 4.0 0.7 0.4 1.2 10.5-12.7 260 0.0077
12(7/20) 3 × 4.0 0.7 0.4 1.2 10.8-13.1 282 0.0070
10 3 × 6.0 0.7 0.4 1.2 11.8-14.0 351 0.0065
10(7/18) 3 × 6.0 0.7 0.4 1.4 12.4-15.0 387 0.0059
8 3 × 10 0.7 0.6 1.4 14.0-16.9 557 0.0053
8(7/16) 3 × 10 0.7 0.6 1.4 14.6-17.5 607 0.0047
6(7/14) 3 × 16 0.7 0.6 1.4 16.5-19.9 850 0.0039
4(7/12) 3 × 25 0.9 0.8 1.4 20.4-24.7 1315 0.0039
2(7/10) 3 × 35 0.9 0.8 1.6 22.9-27.6 1562 0.0034

Four Cores

AWG No. of Cores x Nominal Cross Sectional Area Nominal thickness of insulation Nominal thickness of inner covering Nominal thickness of sheath Nominal overall diameter Nominal Weight Minimum insulation resistance at 90 °C
# x mm² mm mm mm mm kg/km MΩ·km
17 4 × 1.0 0.7 0.4 1.2 8.9-11.2 130 0.011
17(7/26) 4 × 1.0 0.7 0.4 1.2 9.5-11.5 150 0.011
16 4 × 1.5 0.7 0.4 1.2 9.5-11.4 170 0.011
16(7/24) 4 × 1.5 0.7 0.4 1.2 9.7-11.7 185 0.010
14 4 × 2.5 0.7 0.4 1.2 10.4-12.6 240 0.0092
14(7/22) 4 × 2.5 0.7 0.4 1.2 10.6-12.8 256 0.0084
12 4 × 4.0 0.7 0.4 1.2 11.4-13.8 330 0.0077
12(7/20) 4 × 4.0 0.7 0.4 1.2 11.6-14.0 344 0.0070
10 4 × 6.0 0.7 0.4 1.4 13.0-15.7 445 0.0065
10(7/18) 4 × 6.0 0.7 0.6 1.4 13.8-16.7 490 0.0059
8 4 × 10 0.7 0.6 1.4 15.2-18.4 687 0.0053
8(7/16) 4 × 10 0.7 0.6 1.4 15.9-19.2 747 0.0047
6(7/14) 4 × 16 0.7 0.6 1.4 18.0-21.8 1055 0.0039
4(7/12) 4 × 25 0.9 0.8 1.6 22.7-27.5 1670 0.0039
2(7/10) 4 × 35 0.9 1.0 1.6 25.4-30.7 2044 0.0034

Five Cores

AWG No. of Cores x Nominal Cross Sectional Area Nominal thickness of insulation Nominal thickness of inner covering Nominal thickness of sheath Nominal overall diameter Nominal Weight Minimum insulation resistance at 90 °C
# x mm² mm mm mm mm kg/km MΩ·km
17 5 × 1.0 0.7 0.4 1.2 9.6-11.5 157 0.011
17(7/26) 5 × 1.0 0.7 0.4 1.2 10.2-11.9 183 0.011
16 5 × 1.5 0.7 0.4 1.2 10.2-12.3 208 0.011
16(7/24) 5 × 1.5 0.7 0.4 1.2 10.5-12.6 227 0.010
14 5 × 2.5 0.7 0.4 1.2 11.2-13.6 295 0.0092
14(7/22) 5 × 2.5 0.7 0.4 1.2 11.5-13.9 317 0.0084
12 5 × 4.0 0.7 0.4 1.4 12.8-15.5 422 0.0077
12(7/20) 5 × 4.0 0.7 0.6 1.4 13.6-16.4 460 0.0070
10 5 × 6.0 0.7 0.6 1.4 14.5-17.5 551 0.0065
10(7/18) 5 × 6.0 0.7 0.6 1.4 15.0-18.1 610 0.0059
8 5 × 10 0.7 0.6 1.4 16.5-20.0 858 0.0053
8(7/16) 5 × 10 0.7 0.6 1.4 17.3-20.9 937 0.0047
6(7/14) 5 × 16 0.7 0.8 1.4 20.0-24.2 1328 0.0039
4(7/12) 5 × 25 0.9 1.0 1.6 25.2-30.5 1860 0.0039
2(7/10) 5 × 35 0.9 1.0 1.6 27.8-33.6 2500 0.0034
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