
BS7629-1 Cable
Fire resistant screened cables with low smoke and corrosive gas emissions and a voltage rating of 300/500V
Part 1 of British Standard BS7629 refers to multicore and multipair cables. It relates to cables that provide circuit integrity under the effects of fire, mechanical shock and water, for a prescribed period of time, supporting fire-fighting efforts and protecting lives and essential equipment. These cables’ primary function is intended for use in emergency lighting, fire alarm circuits and fire detection systems.
Cables covered under BS 7629-1 have the following characteristics:
Thermosetting insulation with a voltage rating of 300/500V |
Resistance to fire (Circuit integrity) |
Emit limited amounts of smoke and corrosive gases in the event of fire |
Intended for use in emergency lighting, fire detection and fire alarm system circuits |
BS7629-1 Cable Construction
Multicore cables | Multipair cables | |
---|---|---|
Uninsulated conductors | Tinned annealed copper (Class 1 or 2) | Tinned annealed copper (Class 1,2 or 5) |
Insulated conductors | Plain or tinned annealed copper (Class 1 or 2) | Plain or tinned annealed copper (Class 1, 2 or 5) |
Drain wire | One or more tinned annealed copper wires | |
Insulation | Type EI 2, Type EI 3, Type EI 5, GP4 or GP6 | |
Screen | Metallic or laminated metallic tape | |
Sheath | LTS 3 compound |
BS7629-1 cable resistance to fire, mechanical shock and water
BS7629-1 Cable selection
Reference should also be made to British Standard BS5266-1 and BS5839-1 when designing and commissioning emergency fire systems.
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