British Standard BS 7211 for Electric cables. Thermosetting insulated non-armoured cables for voltages up to and including 450/750 V, for electric power, lighting and internal wiring, and having low emission of smoke and corrosive gases when affected by fire.
Requirements for non-armoured cables with thermosetting insulation of rated voltage up to and including 450/750 V, which produce lower levels of smoke and corrosive gases under exposure to fire, compared with corresponding PVC-insulated cables specified in BS 6004.
BS7211 Standard now only covers the following National Types of cables.
- Thermosetting insulated, sheathed, single core cable 450/750V In sizes 1.0mm2 to 35mm2
- Thermosetting insulated, twin, 3-core, 4-core and 5-core circular sheathed cable 450/750V in sizes
- Thermosetting insulated, single-core, flat twin and flat 3-core sheathed cable with circuit protective conductor 300/500V in sizes 1x1mm2 to 3x16mm2
The single-core insulated only cables covered in previous editions of BS7211 Standard have now been moved to BS EN 50525 Electric cables — Low voltage energy cables of rated voltages up to and including 450/750 V (U0/U) Part 3-41: Cables with special fire performance — Single core non-sheathed cables with halogen-free crosslinked insulation, and low emission of smoke
British Standard BS 7211 covers cables with enhanced Reaction to Fire properties, the cables covered by this standard do not have Resistance to Fire properties.
A guide to the use of these cables in fixed installations is given in Annex A of the Standard.