Red fire alarm cable requirements explained
When red cable is required for fire alarm installations, what standards it must meet, common misconceptions, and what “red cable” actually means in practice under BS 5839-1.
Red fire alarm cable is one of the most discussed — and most misunderstood — topics in fire alarm installation. Many people assume all fire alarm cable must be red, that red cable automatically meets the standard’s requirements, or that the colour of the cable is the important thing. None of these assumptions is entirely correct. What matters is the cable’s performance under fire conditions, not its colour.
Red Cable and BS 5839-1
BS 5839-1 does not mandate that fire alarm cable must be red. The standard specifies the performance characteristics that cable must meet — primarily its ability to maintain circuit integrity when exposed to fire — and the requirement that cables are clearly identified. The colour red is a convention that has become widespread in the UK fire alarm industry because it makes fire alarm wiring visually distinct from other building services cables.
The most commonly used fire alarm cable in the UK — often referred to generically as “FP200” after one of the original brands — is typically red. But the colour is a consequence of the cable’s widespread adoption, not a requirement in itself. A correctly specified fire survival cable in another colour is not automatically non-compliant.
What “red cable” actually is
FP200 and Enhanced Fire Survival Cables
The red cable most commonly used in UK fire alarm installations is a fire-resistant cable that meets the requirements for enhanced circuit integrity performance. The key performance standards it must satisfy are:
| Standard | What it tests |
|---|---|
| BS EN 50200 | Circuit integrity under fire conditions — the cable must maintain electrical continuity when exposed to flame and heat for a specified period at defined temperatures |
| BS EN 60332-1 | Flame propagation — the cable should not propagate flame significantly along its length when ignited |
| BS EN 61034 | Smoke emission — the cable should not produce excessive smoke when burning, which would impair visibility during evacuation |
A cable labelled as meeting these performance standards — regardless of its colour — is the correct cable for fire alarm detection and sounder circuits. The performance specification is what determines compliance, not the colour of the outer sheath.
Why red is used
The Practical Reason for Red Cable
The convention of using red cable for fire alarm wiring serves an important practical purpose. Building services in commercial buildings typically include multiple cable systems — mains power, data, security, CCTV, heating controls, and others. Running all of these in the same colour creates a significant risk of confusion during installation, maintenance, and fault-finding.
Red cable immediately identifies fire alarm wiring to any engineer, electrician, or building services contractor working in the building. This reduces the risk of:
- Accidental disconnection of fire alarm circuits during other building works
- Confusion between fire alarm cables and other systems when tracing faults
- Incorrect identification during maintenance or extension works
- Connection of other systems into the fire alarm wiring in error
For these reasons, red cable remains the overwhelming convention in UK commercial fire alarm installations, even though the standard does not mandate it by colour.
Where red cable is specifically required
When Colour Becomes a Requirement
While BS 5839-1 does not mandate red cable by colour, certain other frameworks do reference colour as a requirement:
LPS 1265 — the Loss Prevention Standard for fire detection and alarm systems references red as the expected colour for fire alarm cabling. Installations certified to LPS 1265 (used by some insurers) are expected to use red cable.
Insurer requirements — some commercial insurers and their appointed inspection bodies specifically require red cable in their conditions of cover, making it effectively mandatory for insured premises.
Contractor specifications — many larger contractors, housing associations, and public sector bodies include red cable as a specified requirement in their installation standards, regardless of what BS 5839-1 technically requires.
Common questions
Frequently Asked Questions
Not non-compliant with BS 5839-1 itself, provided the cable meets the required performance standards for circuit integrity. However, it may not meet LPS 1265 requirements or insurer conditions, and the lack of red identification creates a practical risk of confusion with other building services. In practice, using red cable is by far the safer and more defensible choice for any commercial installation, and most competent contractors will not propose anything else.
No — red is a colour, not a performance standard. A red cable that does not meet BS EN 50200 is not a compliant fire alarm cable regardless of its colour. When specifying or purchasing fire alarm cable, always check that the cable is certified to the relevant performance standards — the specification should be printed on the cable sheath. A cable labelled only as “red PVC” with no fire performance standard is not suitable for detection or sounder circuits.
No — and this is a serious installation deficiency. Standard PVC electrical cable has no enhanced fire survival performance and will fail relatively quickly when exposed to fire temperatures. Using it on detection or sounder circuits means the system may stop functioning during the fire itself. It is a false economy that could contribute to a failure of the alarm during an actual fire, with potential liability consequences for the installer, contractor, and building owner. The additional cost of compliant cable is small relative to the total installation cost.