BS6724 Cable
Thermosetting insulated armoured cables - 600/1000V to 1900/3300V - with low emission of smoke and corrosive gases when affected by fire. Manufactured in accordance with British Standard BS6724
This Standard specifies requirements for armoured power supply cables with Cross-Linked Polyethylene (XLPE), Ethylene Propylene Rubber (EPR), or thermosetting polyolefin insulation with an LSZH sheath for use in public areas where there is a need to reduce the risk of harmful smoke and fumes when exposed to fire. Cables manufactured in accordance with BS6724 produce low levels of smoke and corrosive gas when exposed to fire than comparative cables manufactured in accordance with low voltage armoured cable BS5467 and traffic signal cable to BS6346.
BS6724 Cable construction
| 600/1000V | 1900/3300V | |
|---|---|---|
| Conductors | ||
| Single core | Stranded copper (Class 2) or solid aluminium (Class 1) | |
| Two-core | Stranded copper (Class 2) or solid aluminium (Class 1) | N/A |
| Three-core | Stranded copper (Class 2) or solid aluminium (Class 1) | |
| Four-core | Stranded copper (Class 2) or solid aluminium (Class 1) | N/A |
| Five-core | Stranded copper (Class 2) | N/A |
| Multicore auxiliary-core | Stranded copper (Class 2) | N/A |
| Insulation | GP8, GP6 or EI5 | |
| Bedding | Extruded layer of polymeric material compatible with the operating temperature of the cable. HCI levels are not to exceed 0.5% | |
| Armour | ||
| Single core | Plain aluminium wire | |
| Two-core and above | Galvanised steel wire | |
| Outersheath | Extruded layers of compatible polymeric material conforming to the requirements of LTS 1 specified in BS7655. HCI levels are not to exceed 0.5% | |
BS6724 cable can sometimes be referred to by its construction in international markets - XLPE/LSZH/SWA/LSZH for multicore cables.
BS6724 cable core identification
The Standard specifies the following core colour identification system:
Due to mechanical protection provided by their armours, cables manufactured to BS6724 are suitable for applications in industrial wiring and mains distribution where there is a risk of mechanical damage and for direct burial.
| Single core | Brown or Blue |
| Two-core | Brown and Blue |
| Three-core | Brown, Black and Grey |
| Four-core | Blue, Brown, Black and Grey |
| Five-core | Green/Yellow, Blue, Brown, Black and Grey |
Due to mechanical protection provided by their armours, cables manufactured to BS6724 are suitable for applications in industrial wiring and mains distribution where there is a risk of mechanical damage and for direct burial.
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