Fire resistant screened cables 300/500V

 
Uni-Cable 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.   
 
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

 
 
BS 7629-1 is a British Standard that pertains to fire performance cables. Specifically, it covers the requirements and test methods for electric cables intended for use in emergency circuits, control circuits, and essential systems such as fire alarms, emergency lighting, and smoke extraction. The standard is part of the broader set of standards addressing fire-resistant and fire performance cables. These cables are designed for applications where maintaining circuit integrity during a fire is crucial.
 
These cables are particularly relevant to installations where fire resistance is essential, ensuring that critical circuits continue to function during a fire incident. Emergency and safety systems, such as those mentioned earlier, rely on these types of cables to maintain their functionality when needed most.
 
 
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.