Whilst BS 5839-6 has previously been split into six varying Grades, each outlining the level of protection appropriate for certain properties and their corresponding levels of risk, the new update has altered the six sections, removing Grade B and Grade E, whilst Grade D and Grade F have been split into Grade D1 / Grade D2 and Grade F1 / Grade F2 respectively. Grade C has been revised and its recommendations expanded.
The 2019 grading system is as follows:
Grade A |
Separate detectors, sounders and central control and indicating equipment with back-up power supply that conforms to British Standards BS EN 54. |
Grade C |
Separate detectors and sounders that are mains powered with back-up power supply and central control equipment. |
Grade D1 |
A system of one or more mains powered detectors, each with a tamper‑proof standby supply consisting of a battery or batteries (such as FireAngel’s SM-SN-1 and HM-SN-1 alarm). |
Grade D2 |
A system of one or more mains-powered detectors, each with an integral standby supply consisting of a user‑replaceable battery or batteries. (such as FireAngel’s SW1-PF-T and HW1-PF-T alarm). |
Grade F1 |
A system of one or more battery-powered detectors powered by a tamper‑proof primary battery or batteries (such as FireAngel’s ST-622T, ST-750 alarm). |
Grade F2 |
A system of one or more battery-powered detectors powered by a user‑replaceable primary battery or batteries. (such as FireAngel’s SB1-T alarm). |
| Please note: Grades B and E are no longer defined in BS 5839-6:2019. | |
Thermoptek technology combines the very latest in optical sensing with a thermal enhancement – it has two separate sensing elements. The different sensing elements constantly monitor for two different by-products for fires (smoke and temperature). If a rate of temperature rise is detected the sensitivity of the smoke alarm is increased. This provides a quicker response time to all fire types; fast flaming and slow-burning fires.
According to latest BS 5839-6 standards, for maximum LD1 protection you should fit a smoke alarm in the following rooms: Hallway, Landing, Living Room, Bedroom, Airing / Meter Cupboards, Loft, Garage. A smoke alarm is not recommended for installation in a kitchen, you should install a heat alarm in kitchens.
For further guidance on BS 5836-6, please visit our Standards and Regulations Section.
No, the ST-750 is a standalone battery-powered multi-sensor smoke alarm with no interlink options. This unit cannot be interlinked with any other products – please see our FireAngel Specification range or our FireAngel Mains with 9V battery backup range, both of these ranges offer hardwire and wireless interlink options.
