Fire Safety FAQs
Expert answers to common questions about fire alarms, emergency lighting, fire-rated cables, and BS 5839 / BS 5266 compliance for UK residential and commercial properties.
1
BS 5839 is the British Standard for fire detection and alarm systems in buildings. Part 1 covers commercial and industrial premises, Part 6 covers domestic premises. It specifies the design, installation, commissioning, and maintenance of fire detection systems. Compliance is required for most commercial buildings and is strongly recommended for residential properties. Your local building control or fire safety officer may require a BS 5839-compliant system.
2
BS 5266 is the British Standard for emergency lighting. Part 1 covers the code of practice for the emergency lighting of premises, specifying minimum lux levels, durations (typically 1 or 3 hours), and testing requirements. Commercial premises, public buildings, and houses of multiple occupation (HMOs) must comply. Emergency lighting must illuminate escape routes and be tested monthly (functional test) and annually (full duration test).
3
Maintained emergency luminaires are powered continuously and remain on at all times, acting as both normal and emergency lighting. Non-maintained luminaires only illuminate when the mains power fails. Maintained fittings are required in areas such as cinemas and theatres where complete darkness could cause panic. Non-maintained are suitable for offices, corridors, and stairwells where normal lighting remains on during opening hours.
4
Yes. UK landlords are legally required to install smoke alarms on every floor of a rental property and carbon monoxide detectors in rooms with solid fuel appliances. This requirement has been in place since October 2015 under the Smoke and Carbon Monoxide Alarm Regulations. Houses of multiple occupation (HMOs) have stricter requirements under BS 5839 Part 6 and may need interlinked Grade D alarms or a commercial-grade Grade A system.
5
Fire-rated cables (such as MICC, FP200 Gold, or LPCB-approved cables) maintain circuit integrity during a fire, allowing fire alarm systems, emergency lighting, and other life safety systems to continue operating. They are required for all fire alarm and emergency lighting wiring under BS 5839 and BS 5266 respectively. Standard PVC cables are not fire-rated and must not be used for life safety circuits.
6
Under BS 5266, emergency lighting must be tested regularly: a brief functional test monthly (checking the unit activates on mains failure) and a full rated duration test annually (typically 1 or 3 hours depending on the system). All tests must be recorded in a log book. Self-test emergency luminaires can automate this process and display pass/fail status via an LED indicator.
7
For outdoor or damp locations, emergency luminaires should be IP65 rated as a minimum, providing full dust-tight protection and protection against water jets. For areas subject to heavy rain or wash-down, IP66 or IP67 is recommended. Indoor emergency lighting in dry areas typically requires IP20. Always check the specific installation environment and confirm with BS 5266 Part 1 requirements.
8
Domestic smoke alarms (battery or mains Grade D) can typically be self-installed. However, any work on mains wiring must comply with Part P of the Building Regulations and should be carried out by a qualified electrician. Commercial fire alarm systems (Grade A) and emergency lighting installations must be designed, installed, and commissioned by a competent person in accordance with BS 5839 and BS 5266. Certification is required for commercial installations.