BS7846 Cable

Thermosetting insulated armoured fire-resistant cables - 600/1000V - with low emission of smoke and corrosive gases when affected by fire, manufactured in accordance with British Standard BS7846.

BS7846 Cable

British Standard BS7846 specifies requirements for armoured fire-resistant cables with thermosetting insulation - 600/1000V - with low emission of smoke and corrosive gases when affected by fire. The Standard also specifies that circuit integrity performance under fire conditions is to be assessed on the basis of various tests separately measuring resistance to fire, resistance to fire with water spray, resistance to fire with mechanical shock (Category F2), or in combination to include direct mechanical impact with water jet (Categories F30, F60 and F120).

In addition to their fire-resistant properties, cables manufactured in accordance with this Standard have a steel wire armour (SWA) or interlocking steel tape armour which makes them suitable for application where the risk of mechanical damage is a concern. 

These cables are widely used in fixed installations in industrial areas, buildings and similar applications, where maintenance of power supply is required for a defined period of time in the event of a fire.

BS7846 cable construction

Conductor Annealed plain or tinned copper (Class 2)
Insulation GP6 or GP8 with levels of HCI no greater than 0.5%
Bedding Polymeric materials with levels of HCI no greater than 0.5%
Armour Galvanised steel wires or galvanised interlocking steel tape
Outersheath Polymeric material conforming to the requirements for LTS 1 contained in BS7655-6.1

BS7846 Cable core identification

Number of cores Identification
Two-core Brown and blue
Three-core Brown, black and grey
Four-core Blue, brown, black and grey
Five-core Green and yellow, blue, brown, black and grey

BS7846 cable fire resistance categories

The cables under this Standard are categorised according to their special fire resistance characteristics:

F2 Resistance to fire, resistance to water, resistance to fire with mechanical shock, assessed separately when tested in accordance with this Standard
F30 Resistance to fire with direct mechanical impact and fire assessed in combination for 30mins when tested in accordance with British Standard BS8491 for 30mins
F60 As per F30 for 60mins
F120 As per F30 for 120mins
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