BS 7211 Cables
2491B/6701B Single Core Cable
Application and Description
2491B/6701B is equivalent to harmonized code H05Z-K/H07Z-K, these cables are designed for the internal wiring of switchboards and distributor boards with an alternating nominal voltage up to 1000 Volts or a direct voltage up to 750 volts. Generally install in pipes or ducts and internal wiring of appliances with maximum operating temperature of 90º C, 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-5
Thermosetting core insulation type EI5
LSOH - low smoke, zero halogen
Insulation Colour
Green/Yellow, Black, Blue, Brown, Red, White, Yellow, Grey, Violet,Grey, Orange, Pink
Technical Characteristics
- Working voltage: 300/500v (2491B), 450/750v (6701B)
-Test voltage: 2000 / 2500 volts
-Minimum bending radius: 5 x Ø
-Flexing temperature: -15º C to +90º C
-Static temperature: -40º C to +90º C
-Insulation resistance: 10 MΩ x km
Flame retardant: IEC 60332.1
-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
| AWG | No. of Cores x Nominal Cross Sectional Area | Nominal Thickness of Insulation | Nominal Overall Diameter | Nominal CopperWeight | Nominal Weight | Minimum insulation resistance at 90 °C |
| # x mm² | mm | mm | kg/km | kg/km | MΩ·km | |
| 2491B | ||||||
| 20(16/32) | 1 x 0.5 | 0.6 | 2.1-2.6 | 4.8 | 9 | 0.013 |
| 18(24/32) | 1 x 0.75 | 0.6 | 2.2-2.8 | 7.2 | 12.4 | 0.011 |
| 17(32/32) | 1 x 1 | 0.6 | 2.4-2.9 | 9.6 | 15 | 0.010 |
| 6701B | ||||||
| 16(30/30) | 1 x 1.5 | 0.7 | 2.8-3.5 | 14.4 | 24 | 0.010 |
| 14(50/30) | 1 x 2.5 | 0.8 | 3.4-4.3 | 24 | 35 | 0.009 |
| 12(56/28) | 1 x 4 | 0.8 | 3.9-4.9 | 38 | 51 | 0.007 |
| 10(84/28) | 1 x 6 | 0.8 | 4.4-5.5 | 58 | 71/td> | 0.006 |
| 8(80/26) | 1 x 10 | 1.0 | 5.7-7.1 | 96 | 118 | 0.0056 |
| 6(128/26) | 1 x 16 | 1.0 | 6.7-8.4 | 154 | 180 | 0.0046 |
| 4(200/26) | 1 x 25 | 1.2 | 8.4-10.6 | 240 | 278 | 0.0044 |
| 2(280/26) | 1 x 35 | 1.2 | 9.7-12.1 | 336 | 375 | 0.0038 |
| 1(400/26) | 1 x 50 | 1.4 | 11.5-14.4 | 480 | 560 | 0.0037 |
| 2/0(356/24) | 1 x 70 | 1.4 | 13.2-16.6 | 672 | 780 | 0.0032 |
| 3/0(485/24) | 1 x 95 | 1.6 | 15.1-18.8 | 912 | 952 | 0.0032 |
| 4/0(614/24) | 1 x 120 | 1.6 | 16.7-20.9 | 1152 | 1200 | 0.0029 |
| 300 MCM (765/24) | 1 x 150 | 1.8 | 18.6-23.3 | 1440 | 1505 | 0.0029 |
| 350 MCM (944/24) | 1 x 185 | 2.0 | 20.6-25.8 | 1776 | 1845 | 0.0029 |
| 500MCM(1225/24) | 1 x 240 | 2.2 | 23.5-29.4 | 2304 | 2400 | 0.0028 |
