BS 7211
BS7211 cablefeatures Electric cables –The thermosetting insulated and thermoplastic sheathed circularcables for voltages up to and including 450/750 V for electric power and lighting and having low emission of smoke and corrosive gases when affected by the fire.
This British Standard specifies requirements and test methods for the construction and performance of cables that:
a) have thermosetting insulation of rated voltage up to and including 450/750 V;
b) Emit limited amounts of smoke (see 16.6) and corrosive gases when subjected to relevant tests compared with corresponding PVC cables conforming to BS 6004;
c) are intended for electric power and lighting.
The types of BS 7211 cableincluded are:
- thermosetting insulated and thermoplastic low smoke halogen-free sheathed cable 450/750 V single core 6181B;
- thermosetting insulated and thermoplastic low smoke halogen-free sheathed circular cables 450/750 V, 2-core 6182B, 3-core 6183B, 4-core 6184B and 5-core 6185B ;
- thermosetting insulated and thermoplastic low smoke halogen-free sheathed cables 300/500 V single-core 6241B, flat-twin 6242B, flat 3-core6243B with circuit protective conductor.
The insulation and other components are suitable to permit operation of the cables at a maximum sustained conductor temperature of 90 °C and for a maximum short-circuit conductor temperature of 250 °C (for a maximum period of 5s)
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