Fire rated cable for a fire alarm system keeps circuits working during a fire for a tested period. That matters because sounders, voice alarm speakers and interfaces must keep operating while people evacuate. UAE designs usually follow BS 5839-1 or NFPA 72, which set different survivability rules. Using ordinary cable, or fixing fire cable with plastic clips, can defeat the whole system.

Cable choices are often made quickly on site, but are difficult and disruptive to correct later. This guide explains the difference between standard and enhanced fire resisting cable under BS 5839-1. It covers NFPA 72 survivability for American-style designs and the importance of correct fixings. It also lists what owners and contractors should check during inspection and maintenance.

What is fire rated cable for fire alarm systems?

Fire rated cable, also called fire resisting cable, keeps circuits working during a fire for a defined time. It uses insulation and construction that maintain circuit integrity even while the cable burns. Fire alarm systems use it for detection loops, sounder circuits, power supplies and critical interfaces.

The cable's rating comes from standard fire tests that heat the cable while it carries current. Tests may add mechanical shock and water spray to reflect firefighting conditions. A passing cable is classified for a set duration, such as 30 or 120 minutes.

Quick Answer

Fire rated cable keeps fire alarm circuits working during a fire for a tested period, such as 30 or 120 minutes. Classification comes from standard fire, shock and water tests.

What is the difference between standard and enhanced fire resisting cable?

BS 5839-1 recognises two levels of fire resisting cable for fire alarm systems. Standard cable must achieve the PH30 classification under BS EN 50200, plus its Annex E water spray test. Enhanced cable must achieve PH120 under BS EN 50200 and also pass BS 8434-2.

Standard cable suits most ordinary buildings where evacuation is quick and simultaneous. Enhanced cable suits large, tall or complex buildings, and systems supporting phased evacuation or long operating times. BS 5839-1:2025 kept these definitions from earlier editions, though the cable clause is now Section 25.

Quick Answer

Under BS 5839-1, standard fire resisting cable meets PH30 under BS EN 50200, while enhanced cable meets PH120 and BS 8434-2. Enhanced cable suits tall, complex or phased-evacuation buildings best.

How does NFPA 72 treat fire alarm cable survivability?

NFPA 72 uses pathway survivability levels to decide how well circuits must resist fire damage. Levels 2 and 3 include two-hour options, while Level 4 allows one-hour options where permitted. These levels are common for voice evacuation circuits in buildings using relocation or partial evacuation.

Circuit integrity cable in American systems is usually tested and listed under UL 2196 for two-hour performance. The chosen survivability level must appear in the approved design and match the installed cable. Our voice evacuation system guide explains why those circuits often need higher protection.

Quick Answer

NFPA 72 sets pathway survivability levels, with two-hour options at Levels 2 and 3 and one-hour options at Level 4. Voice evacuation circuits in towers often need these survivability levels.

How should fire rated cable be fixed and installed?

Fire rated cable must be supported by fixings that survive fire as long as the cable itself. Metal clips, ties or cable trays prevent cables collapsing and blocking escape routes or breaking circuits. Plastic clips and ties alone can melt early, letting cables fall away.

BS 5839-1 recommends one common colour for fire alarm cables, preferably red, avoiding black or white. The minimum conductor size in its recommendations is 1 mm². Joints should be avoided where possible, and any junction boxes must maintain the same fire performance as the cable.

Quick Answer

Fix fire rated cable with metal clips, ties or trays that survive fire, never plastic alone. BS 5839-1 also prefers red cable and recommends a minimum 1 mm² conductor size.

What should owners check during fire alarm maintenance?

Owners should confirm that cable types match the approved design and the installation certificate. Look for plastic-only fixings, damaged sheaths, unsealed penetrations and ordinary cable added during later alterations. Fit-out contractors sometimes extend circuits without using the correct fire rated cable or fixings.

Insulation resistance and earth fault readings help show whether cables have been damaged over time. Any new work should record cable type, rating and fixing method in the maintenance file. Cable condition forms part of routine fire alarm maintenance, so ask your contractor to report defects clearly.

Quick Answer

Check that installed cable matches the approved design, uses fire-surviving fixings and has not been extended with ordinary cable. Record the cable type, rating and fixing method for every alteration.

Frequently Asked Questions

Is fire rated cable mandatory for fire alarm systems in the UAE?
Approved fire alarm designs in the UAE normally require fire resisting cable for critical circuits under BS 5839-1 or NFPA 72. The approved design specifies the exact cable type required.
What does PH30 mean on a cable?
PH30 means the cable maintained circuit integrity for 30 minutes in the BS EN 50200 fire and shock test. It is the baseline level required for standard fire resisting cable.
What does PH120 mean on a cable?
PH120 means the cable maintained circuit integrity through the BS EN 50200 test for 120 minutes. Enhanced fire resisting cable must also pass BS 8434-2, which includes water spray exposure.
Why is fire alarm cable red?
BS 5839-1 recommends a single common colour for fire alarm cables, preferably red, so they are easily identified. Black and white cables should not be used for fire alarm circuits.
Can plastic cable ties be used for fire alarm cable?
Plastic ties alone should not support fire alarm cable, because they can melt early and let cables fall. Metal fixings, clips or cable trays should carry the cable's full weight.
What is circuit integrity cable?
Circuit integrity cable is listed to keep operating during a fire, commonly for two hours under UL 2196. It is commonly used in NFPA 72 designs needing two-hour pathway survivability.
Is LSZH cable the same as fire resistant cable?
No, low smoke zero halogen describes limited smoke and halogen emission when the sheath burns. Fire resistant cable describes circuit integrity during fire, although many fire cables are also LSZH.
Does BS 5839-1:2025 require existing cables to be replaced?
No, the 2025 revision does not require existing systems to be upgraded simply because it was published. Maintenance and new work should follow the edition the relevant Civil Defence accepts.
Where is enhanced fire resisting cable required?
BS 5839-1 recommends enhanced cable in larger or complex buildings, such as tall towers or phased-evacuation premises. The designer's risk assessment and the approved design confirm exactly where it applies.
How can I tell which fire cable is installed?
Cable sheaths are normally printed with the manufacturer, type and the standards met at regular intervals. Compare those markings with the approved design, the cable schedule and the installation certificate.

Main Takeaways

Fire rated cable keeps fire alarm circuits working during a fire for a tested and classified period. BS 5839-1 defines standard cable as PH30 and enhanced cable as PH120 with BS 8434-2. NFPA 72 uses pathway survivability levels, offering two-hour and, at Level 4, one-hour options. Metal fixings, red sheaths and matching records keep installations compliant and easy to check.

Getting fire alarm cabling right

Fire rated cable is one of the least visible parts of a fire alarm system, yet circuits depend on it completely. The right cable, correctly fixed and recorded, keeps sounders and speakers working while people escape. Mistakes usually appear during fit-outs and alterations, not during the original installation. Regular inspection catches those errors long before a real fire exposes them.

If your building has had several tenant fit-outs, check whether new cabling matches the approved design and fixing requirements. Ask your contractor to record cable types and ratings during every alteration. QSERV installs and maintains fire alarm systems, including cabling, for commercial and residential buildings across the UAE. Contact us to inspect your fire alarm cabling and fixings on site.

Sources & References

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