bs 5839-6 2004 fire detection

7/21/2019 BS 5839-6 2004 Fire Detection

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Grades and Category

BS 5839-6: 2004 Fire detectionand alarm systems

Presented byNeil Perdell, National Technical Manager,

Aico Ltd


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Grades & Category

Grade of system - the type of system tobe installed...

e.g Mains powered alarms with back-up

Category of system - the extent of thesystem...

The number of alarms installed & where


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Grades of system

Grade A

A fire detection & alarm systemwhich incorporates control &

indicating equipment conforming toBS EN 54-2 and power supplyequipment conforming to BS EN 54-

4, and which is designed & installedin accordance with sections 1 to 4of BS 5839-1:2002 except certainclauses


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Grade Aimportant difference

from Pt.1 systemStandby supply

72 hrs back-up(plus15 mins in alarm)

Pt.1 systems minimum 24 hrs


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Grades of system

Grade B

A fire detection & alarm systemcomprising fire detectors (other thansmoke & heat alarms), fire alarmsounders and control & indicatingequipment conforming to BS EN 54-2

(and power supply equipmentconforming to BS EN 54-4) or toAnnex C of this part of BS 5839.


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Grade A & B system

Mains

power

supply

Sounder circuit

Detector circuit

Manual Call Point circuit

All circuits at 24VDC in fireresistant cable

Central control panel


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Grades of system

Grade C

A system of fire detectors and alarm

sounders (which may be combinedin the form of smoke alarms)connected to a common power

supply, comprising the normal mainsa standby supply, with centralcontrol equipment.


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Grade C system

CentralControl

MainsSupply

Smoke

alarm

Smoke

alarm

Smoke

alarm

System may be mainspowered or ELV (12VDC)


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Grades of system

Grade D

A system of one or more mains

powered smoke alarms, each withan integral standby supply. (Thesystem may, in addition, incorporate

one or more mains-powered heatalarms, each with an integralstandby supply)


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Grade D system

Mains powersupply

Standard PVCcable

Rechargeable cells PP3 Battery

OR


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Grades of system

Grade E - mains smoke/heat alarmswith no standby supply

Grade F - battery poweredsmoke/heat alarms


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Categories of system

LD3a system incorporatingdetectors in all circulation spaces

that form part of the escape routesfrom the dwelling.

Hallways, Landings

Open PlanLounges, Sitting Room


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Hallway Landing

Category LD3

Optical or

Multi-Sensor


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LD2a system incorporatingdetectors in all circulation spaces

that form part of the escape routesfrom the dwelling, and in all roomsand areas that present a high fire

risk to occupants. Same as LD3 plus Living Room &

Kitchen


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Category LD2

Optical or

Multi-Sensor

Heat

Ionisation,

Optical or

Multi-Sensor

Hallway

Kitchen

Living Room

Landing


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Remove

Protected

Enclosure

Sprinkler Protection,

plus enhance fire

detection and alarm

system (LD1)

Open planLD2


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LD1a system installed throughout the

dwelling, incorporating detectors in all

circulation spaces that form part of theescape routes from the dwelling, and in

all rooms and areas in which fire may

start, other than toilets, bathrooms and

shower rooms.


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LandingHallway

BedroomBedroom

Bedroom

Dining Room

Living Room

Kitchen

Category LD1

Ionisation

Optical or

Multi-Sensor

Heat

Ionisation,Optical or

Multi-Sensor


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Category PD systems

PD1as for an LD1 system

PD2detectors in defined rooms/areas


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Class of dwelling New BuildExisting to

BS5588-1

Existing not to

BS5588-1

Grade D, LD2 d Grade F e, LD3 f Grade D, LD2 g

Rented single storey Grade D, LD2 d Grade F e h, LD3 f Grade D, LD2 g

Owner occupied singlestorey

Owner occupied 2 storey

Rented 2 storey

Grade D, LD2 d

Grade D, LD2 d

Grade F e, LD3 f Grade D, LD2 g

Grade D, LD2 gGrade D, LD3 f

3 Storey house

4 storey house

Grade D, LD2 d

Grade B, LD2 d

Grade D, LD3 f

Grade D, LD2dl

Grade D, LD2 g

Grade D, LD2 dg

Minimum Grade and CategoryNo floor area greater than 200sqm


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BS5588-1

Existing not to

BS5588-1

Grade D, LD2d

2 storey

Grade A, Category LD2, with detectors sited inaccordance with recommendations of BS 5839-1 fora Category L2 di j system

Bungalow, flat

3 or more storey

Grade B, LD2 d

Grade D, LD3f

Grade D, LD2g

Minimum Grade and CategoryOne or more floor greater than 200sqm

Grade B, LD2 d i Grade B, LD2 d g


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BS5588-1

Existing not to

BS5588-1

1 and 2 storey

Individual dwellings

Grade D, LD2

d

Grade D, LD2 d

Grade D, LD3 l f

Grade D, LD3 n

Grade D, LD2 l g

Grade D, LD2 g

Communal areas Grade A, LD2 detectors installed to L2

Minimum Grade and CategoryHouses in Multiple Occupation


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New Build to BS 5839-6

Note d

Smoke alarms in hallway & landings Heat alarm in Kitchen

Heat alarm or smoke alarm in principal

habitable room

1, 2 & 3 storeys - Grade D, Category LD2d

x


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Choice of systemExisting

Rented single storey: Grade Fe, Category LD3f

Note e

Grade E if battery replacement an issue

Grade D if mains supply is suspect

Note f

Category LD2 if Risk Assessment dictates


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Choice of systemExisting

Rented 2/3 storey: Grade D, Category LD3f

Note f



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Houses in Multiple Occupation

1 or 2 storey: Grade D, Category LD3l,f

Note l

Detectors in communal areas & circulationspaces in each dwelling of 2 or more rooms.

Note f


Larger HMOs

Individual units: Grade D, Category LD3

n

Note n


Communal areas: Grade A, Category LD2


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False alarms - commentary

False alarms cause disablement this partof BS 5839 now places great emphasis on theneed to limit false alarms.

Quality equipment, correctly installed. The correct alarm for thejob

- Ionisation sited away from kitchens.

- Optical sited away from bathrooms.- Heat rarely causes false alarm.

- Multi-sensor (Optical & Heat)could replaceoptical


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False alarms

Limitation of false alarmsClause 12.2 Recommendations:

Grade D systems should have a silencing facility

providing that the facility can be operated whenstanding at floor level.


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Thank You

bs 5839-6 2004 fire detection

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