Re-take - Useful Information for 2394 :

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Limitation of false alarms

12.2 Recommendations

iv) In Grade D and E systems, means should be provided for silencing fire alarm signals that result from, for example, a fault in a detector. This may comprise a means for isolation of mains power to the detector.

Since such faults are likely to be relatively rare, it is acceptable for the means of isolation to involve the use of a tool. However, isolation of power to any detector should not result in isolation of power to other electrical equipment, such as lighting, in the premises.

Note 1 , A number of manufacturers use a fixed base for the electrical connections, and the smoke or heat alarm can be readily removed by use of a tool-operated release tab, et

6 Monitoring of circuits

6.2 Cont.
Note : This standard contains no recommendations for monitoring of wiring or power supplies in Grades D, E or F systems. However, BS-EN-14604 requires that mains-powered smoke alarms (which are used in Grades D and E systems) incorporate a green mains-on indicator, which is continuously illuminated when mains power is present. BS-5446-2 makes the same requirement for heat alarms.

 

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Generally, doors are considered the weak link in sound reduction but caution is needed with this assumption

► BS 5839-6 , recommends that, if an audible alarm is intended to rouse sleeping persons, a sound level of 75 dB(A) ought to be achieved at the bedhead when all doors are shut, although this will not guarantee that every person will be awakened, particularly if they are under the influence of alcohol or drugs.

 

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Categories of System :
There are three Categories of ( LD ) systems for Life protection in Dwellings that can be installated , depending on the fire Risk & Regulations .

Point to Note :
BS-7671:2008 + Amd 1 2011: (( Electrical Connections ))
526.6. There shall be no appreciable strain on the connections of conductors .

 

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They are a reason for me downloading this Stuff . I'll make it clear shortly . off to work

Standards in Approved Document B Building Regulations for flats , thus intended for stay put fire policy then only the part 6 devices are required

The only time this can be viewed differently is when there is a duty of care toward the occupants of the dwelling
landlord(s) has a duty of care

Commentary in ( Part - 6 )

13.1.2. Audibility ))

A fire detection and fire alarm system only provides satisfactory protection of life if it is capable of rousing the principal occupants of the dwelling from sleep (e.g. the adult occupants in a typical single-family dwelling). No particular sound pressure level is certain to rouse all occupants of a dwelling in all circumstances. Depth of sleep varies during the course of the sleep period and also varies from one person to another. Greater sound pressure levels are often required to rouse children from sleep than are necessary in the case of adults. BS 5839-1 recommends that, if an audible alarm is intended to rouse sleeping persons, a sound level of 75 dB(A) should be achieved at the bedhead when all doors are shut, although this will not guarantee that every person will be awakened, particularly if they are under the influence of alcohol or drugs.

Most fire detection and fire alarm systems in dwellings comprise smoke alarms, which are usually fitted in, at least, the circulation areas, such as hallways and landings. BS 5446-1:2000 requires that the sound output of a smoke alarm be at least 85 dB(A) at three metres. Most domestic doors attenuate sound by around 20 dB; greater attenuation can occur in the case of solid doors, such as fire doors. It is therefore unlikely that a smoke alarm on, for example, the upstairs landing of a two-storey house will produce a sound level of 75 dB(A) at the bedhead in each bedroom, particularly if the bedroom doors are shut; levels of 55 dB(A) to 65 dB(A) are more likely. There appears to be no evidence to show that lives are being lost due to inadequate audibility of the fire alarm signal from smoke alarms, except where people are incapacitated to such a degree that even much higher sound levels would not waken them. This might be because, in their own homes, people can be roused by an unusual sound of relatively low level compared with the sound level that may be required to wake them in premises with which they are unfamiliar (e.g. a hotel).

BS-5839-6 : Fire detection and fire alarm systems for buildings , Part - 6 Code of practice for design , installation . commissioning and maintenance of fire detection and fire alarms systems in domestic premises .

BS-5839-6 :2013: Fire detection and fire alarm systems for buildings . Code of practice for the design , installation , commissioning and maintenance of fire detection and fire alarms systems in domestic premises .

BS-5839-6 :2013: give recommendations for the planning , design , installation , commissioning and maintenance of fire detection and fire alarms systems in domestic premises that are :

□ Designed to accommodate a single family
□ Houses in multiple occupation that comprise a number of self-contained units , each designed to accommodate a single family
□ Sheltered housing , including both the domestic units and the common areas

the recommendations apply the both New & Existing domestic premises

Recommendations for routine attention are also given.
The systems covered in BS-EN-5839-6 : 2013 range from those comprising a single self-contained smoke alarm to systems of the type described in BS-5839-1 . The recommendations of this part of BS-5839 may also be applied to the fire detection components of combined domestic fire and intruder alarm systems or fir and social alarm systems .

BS-5839-6 :2013: applies to forms of domestic premises , including bungalows , multi-storey houses . individual flats and maisonettes , mobile homes , sheltered housing , housing providing NHS supported in the community ( as defined in Heath Technical Memorandum 88 [1]) mansions , shared houses and houses divided into several self-contained single-family dwelling units . it does not apply to hostels , caravans or boats ( other than permanently moored boats used solely as residential premises ) or to the communal parts of blocks of flats or maisonettes . it does not apply to any premises used for purposes other than as ( domestic premises ) e.g. small shops , factories or similar premises used solely as places of work /

BS-5839-6 :2013: is intended for , Etc installers and other responsible for implementing fire precautions in domestic premises , it is not intended for occupiers , for whom advice is published by the Government . However , recommendations are given for simple systems that may ne installed by non-specialists

The recommendations refer principally to fire detection and fire alarm systems installed for the purpose of life safety . However , recommendations are given for systems that are also intended to protect property .

Supersession :
This part of BS-5839-6: 2013 . supersedes BS-5839-2:2004 . which is withdrawn .

 

[Richard Burns]

Refer post 797 and 799 re sound output of smoke alarms at bedhead

 

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Must thank my learned colleague tazz , guiding me on the right path . Part - 1 & Part - 6 , Thank mate

Using the building , for a dwelling , the design may result in either a system of smoke & heat alarms or a more complex system such as . a
BS-5839-1 Grade A which may be found in a large dwelling or a house in multiple occupation

The design of the system can ( Either ) meet the requirements of BS-5839-1 ; BS-5839-6 or for a new or materially altered dwelling . Approved Document B .

Smoke alarms own RCBOs
Re-wired a shop , with two flats above the shop premises . The flat(s) have each 1 Heat , 1 Ionisation , 1 Optical
5 detectors . Heat , Ionisation , Optical . large shop .

Fire & Safety Services . was working of ( BS-5839 part 6 )
Fire Inspector . was doing his rounds in the shop . happy about the (( Detectors to BS-5839-6 )) as he said this is the , Minimum protection ( LD3 )

Fire Inspector . ask for two remote sounder from the shop to the flats upstairs ( individual )

haven't done this before , the old brain was on overdrive here . Fire Inspector looked through the flats and said no fire doors , normal doors ,

BS-5839-6 recommends achieving a sound level of 75 dB(A) at the bedhead. It also recommends more than 85 dB(A) at the doorway of each bedroom where doors exceed 20 dB ..." unless there is a sounder in the bedroom ". As domestic smoke alarms usually generate 85 dB(A), neither of these levels can be achieved in most situations and a bedroom alarm or sounder is justified. Also, research has shown that young children can sleep through loud alarms while elderly people and others with hearing impairments may also not respond.

after a talk with him Fire Inspector . he gave me some options .
• Yes you can use 3 core & E . depends on the circumstance . Part - 6 .
from my point of view . I have used ( FP - 200 ) after leaving the shop , 50/60 metres . on the grounds off identification .

from the Shop : if this was 3 - core & E . after the flats have been Isolated , to the layman would he know that there is a live cable in the attic ??
That's why I used this system ( FP - 200 ) and not 3 - core & E . grounds of Safety .

Now am a bit wiser about 75 dB(A) at the bedhead . The doors , The doors .
Yes . fire Inspector said install the remote sounder in the hall next to the bedroom door . ( No fire door ) I have decided to install the remote sounder in the bedroom . end of .

PS , I never got any paperwork with this . I have asked the fire Inspector for information on this matter Part - 6 . remote sounder 2013

► (( In the drawing , am only making you aware of the ( dB ) the doors . the doors )) ◄ something to work off .

In my case Part - 6 : ( LD3 ) BS-EN-14604:2005 , Ei141RC Ionisation , Ei144RC Heat , Ei146RC Optical & Aico EI167RC Remote Sounder
Remote Sounder. Mains powered. Interconnects with 2100, 160RC and 140 series alarms

Fire Inspector , was happy about the safety aspect of Electrical Safety . He backed me up on this .

PS the landlord was doing handstands

 

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Which one of the following is not part of the requirements for fault protection : A) 411.3. 411.3.1. 411.3.1.1.

- Protective earthing .
- Protective equipotential bonding
- Automatic disconnection
- Protection by insulation of live parts

Protection against electric shock : Chapter 41.
410.3.3. The following protective measures generally are permitted :

(i) Automatic disconnection of supply ( Section 411 )
Note : In electrical installations the most commonly used protective measure is automatic disconnection of supply .

Section 411: Protective Measure : automatic disconnection of supply

 

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Extracts : 2008:

Certificate of Design , Installation and Commissioning of a Fire Detection and Alarm system of Grade B , C , D , E , F in a dwelling

□ Details of the Client .
This section of the certificate needs no explanation require only that the client be indentified .

□ Details of the fire detection and alarm system .
This requires the address at which the system is installed to be stated . together with extent of the installed system and the identification of the status of the system in terms of " New or a Modification "

Commissioning
Additionally , the model and serial number of an instrument used for testing the ( sound level ) must be recorded in the space provided . An instrument complying with BS-EN-61672 , class 2 , with a slow response and " A " weighting is suitable for measuring the sound level .

it should be noted , however , that sound pressure tests may be unnecessary . The requirements of 85 dB(A) at the bedroom door , with the door open , will be deemed to have been met if a smoke alarm complying with BS-5466 is located within 3 m of the doorway .

In order to get accurate and repeatable measurements, it is essential that a sound level meter meets the relevant standards. Most measurement regulations will state the standards that should be met by the equipment.

Sound Level Meter Standards
To satisfy most regulations, new meters should meet the standard IEC 61672 (or the British Standard equivalent BS-EN-61672) to either Class 1 or Class 2. There are other standards for the Calibrator, for noise dose meters, personal sound exposure meters, octave band filters and so on. Here is a summary of the most important standards.

Standard : IEC 61672
Relates To : Sound Level Meters
Electro acoustics - Sound level meters
This is the most recent sound level meter standard and the one that modern measurement regulations will require.
Grades in order of accuracy: Class 1, Class 2

Standard : IEC 60651
Relates To : Sound Level Meters
Specification for Sound Level Meters
This standard has been superseded by IEC 61672. Older meters meeting this standard can still be used for many applications. Originally this standard was called IEC 651, but was renamed IEC 60651.
Grades in order of accuracy: Type 1, Type 2

Standard : IEC 60804
Relates To : Sound Level Meters
Integrating-Averaging Sound Level Meters
This standard has been superseded by IEC 61672. It was originally called IEC 804 but was renamed IEC 60804. It extends IEC 60651 and describes the performance of Integrating sound level meters.

 

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2013 / 14
BS-5839 Parts 6 .

Detection & Alarm Systems .

Power supplies
1 ) The power supply for fire alarm system should be taken from the dwelling's mains electricity supply . The mains supply to the smoke alarm(s) should comprise :

a) a single independent circuit at the dwelling's main distribution board ( consumer unit ) :
or
b) a single regularly used local lighting circuit . ( This has the advantage that loss of supply will be rectified to restore the lighting )

Most installations in dwellings , carried out in accordance with the 17th Edition of the IET Wiring Regulations , will have a 30mA RCD ( residual current device ) or RCBO ( residual breaker with overcurrent protection ) protecting all circuits . in this circumstance it is arguably preferable for the supply for the fire alarm systems to be taken from a regularly used lighting circuit as operation of the RCD or RCBO will soon be known , ( for other than Grade d systems , BS-5839-6 recommends avoiding the use of RCDs on fire system circuits . This will usually require clipping cables direct to the surface or enclosing in steel conduit or the like )

The Approved Document requires a means of isolation for the smoke alarms so that they can be isolated with the dwellings lights on . This does not usually necessitate separate isolation facilities as most smoke alarms can be removed from their mounting plate ; this satisfies the recommendation for means for isolation .

 

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Smoke alarms for landlords & agents

The Building Regulations (1991) state that all properties built since June 1992 must be fitted with mains operated interlinked smoke detectors/alarms with at least one detector per floor level. .. ( Regarding rented properties of any age )

2013 : Scope of Part P ( BR )

Part P applies to electrical installations in buildings or parts of buildings comprising :
i) dwelling houses and flats;
ii) dwelling and business premises that have a common metered supply - for example shops and public houses with a flat above with a common meter ;

 

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Carbon monoxide fire detectors ( Clauses 10.1.4 & 10.2 )

Carbon monoxide fire detectors can be immune to certain environmental influences that can cause false alarms in other detectors such as dust , steam and cigarette smoke , whilst responding to most types of fire appreciably faster than most heat detectors .

Note : The 2013 version of BS-5839-6 advises :
e) Carbon monoxide fire detectors , or multi-sensor detectors incorporating a carbon monoxide sensor , should not be used within dwellings , unless :

i) the detectors are incorporated within a Grade A , B or C, system and there is a high likelihood that the system will be subject to periodic maintenance by a competent person at periods not exceeding 12 months ; or

ii) a fault warning is given to indicate the need to replace the electrochemical cell of the detector before it reaches the end of its anticipated life .

f) Subject to compliance with 10.2e ) above , carbon monoxide fire detectors may be installed within the circulation areas of a dwelling in conjunction with an equal number of optical smoke detectors .

g) Subject to compliance with 10.2e ) carbon monoxide fire detectors may be installed in any rooms within a dwelling , other than kitchens .

Note 5 : if , in any room of dwelling , a heat detector could provide adequate fire protection , a carbon monoxide detector may be used instead .

 

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2013 .

Fire safety enforcing authority : The body responsible for enforcing the Fire Safety Order 2005 This is usually the fire & rescue authority .
Fire Safety Order : The Regulatory Reform ( Fire Safety ) order 2005 ( SI 2005 / 1541 , The Stationery Office Ltd )
Local authority : The local authority empowered to carry out the building control function and to enforce Building Regulations in their area by virtue of section 91(2) of the Building Act 1984 .

 

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( BR ) 2013

Domestic installations

are within the compass of the Electricity at Work Regulations when persons are at work , i.e. employed to work in the premises , otherwise they are not . However , the same basic principles apply as are appropriate to places of work , in the maintenance of domestic installations would comprise .

a ) routine checks .
b) periodic inspection and , as necessary , testing .

in a user manual , a householder must be advised that as well as a professional periodic inspection and test at least every ten years , all defects must be repaired as they arise . if there are signs of wear , overheating , looseness , or difficulty in operating equipment then an electrician should be instructed to inspect the installation and maintain as necessary .

 

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2013 : Fire detection & Alarm systems

Inspection , testing & certification
Inspection & testing

The fire alarm electrical installation must comply with Part P of the Building Regulations .
Test results may be included in the electrical installation certificate ( and schedules ) if carried out as part of the electrical installation ; otherwise a minor electrical installation certificate shall be completed ( for grade D systems ) In all cases after successful testing and commissioning , a fire system certificate for design , installation and commissioning must be completed and given to the person ordering the work .

2013 : ( BR ) Installation and commissioning certificate ( Grade D system )
The fire alarm installation is to be designed , installed and tested in accordance with BS-5839-6

Testing
The wiring of one fire alarm installation may be included in the Electrical Installation Certificate ( and schedules ) if carried out as part of the electrical installation ; otherwise a minor Electrical Installation Certificate shall be completed ( for Grade D systems ) In all cases after successful testing and commissioning , a fire system certificate for design , installation and commissioning must be completed and given to the person ordering the work .

Fire detection & Alarm systems
( BR )

Handover
Inspection , test and commissioning certificates ( and schedules ) manufacturer's instructions and necessary guidance are handed over to the person ordering the work .

 

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( BR ) 2013

PME - supply ( TN-C-S system )
Based on 25mm[SUP]2[/SUP] tails and selection from Table 54.7. of BS-7671:

Notes :
1) An isolator is not always installed by the electricity distributor .. ( DNO )
2) Distribution will quote a ( Ze - 0.35Ω ) and a fault level of 16kA . A loop impedance of 0.35Ω equates to a fault level of , 230V ÷ 0.35Ω = 657A . 16kA is the worst-case short-circuit fault level and 0.35Ω the worst-case external earth-loop-impedance .