Eland Cables Cable By Standard3

BS7629-1 Cable

Fire resistant screened cables with low smoke and corrosive gas emissions and a voltage rating of 300/500V

BS7629-1 Cable

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
Multicore circular cables can be of 2-core, 3-core or 4-core construction with uninsulated circuit protective conductor, and of 7-core, 12-core, 19-core, 2-pair and 3-pair construction with uninsulated tinned annealed copper drain conductor of not less than 0.5mm2. All cables in this standard include a metallic layer, which provides electrostatic screening.
Additionally, copper conductor cables manufactured to BS7629-1 have a Low Smoke Zero Halogen (LSZH) insulation and sheathing that meets the standard of BS EN 60754 which specifies that the level of hydrochloric gases emitted during fire may not be greater than 0.5%. Complete cable tests include Smoke emission to BS EN 61034-2 ,  Flame propagation to BS EN 60332-1-2 , fire resistance to BS EN 50200 and BS 6387, categories C, W, Z.

BS7629-1 cable resistance to fire, mechanical shock and water

This Standard specifies that the cable must have a minimum duration of survival of 30 minutes (PH30). They must resist fire and impact alone for 15 minutes, followed by 15 minutes of fire, impact and water.

BS7629-1 Cable selection

Eland Cables supplies fire performance cables manufactured in accordance with BS7629-1, including the Standard and Enhanced Fire Resistant cable. The Enhanced cable benefits from a mica glass tape offering a further barrier to fire.

Reference should also be made to British Standard BS5266-1 and BS5839-1 when designing and commissioning emergency fire systems.
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