1、BS EN 50849:2017Sound systems for emergencypurposesBSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06BS EN 50849:2017 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN 50849:2017.It supersedes BS EN 60849:1998 which will be withdrawn
2、 30 September 2017.The UK participation in its preparation was entrusted to TechnicalCommittee EPL/100, Audio, video and multimedia systems and equipment.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all
3、 the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2017. Published by BSI Standards Limited 2017ISBN 978 0 580 87714 8 ICS 13.320 Compliance with a British Standard cannot confer immunity from legal obligations.This British S
4、tandard was published under the authority of the Standards Policy and Strategy Committee on 31 March 2017.Amendments/corrigenda issued since publicationDate T e x t a f f e c t e dBS EN 50849:2017EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 50849 March 2017 ICS 13.320 Supersedes EN 60849:199
5、8 English Version Sound systems for emergency purposes Systmes lectroacoustiques pour situations durgence Elektroakustische Notfallwarnsysteme This European Standard was approved by CENELEC on 2016-11-07. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate t
6、he conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CENELEC member. This European Sta
7、ndard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CENELEC members ar
8、e the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, P
9、oland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung CEN-CENELEC Management Centre: Ave
10、nue Marnix 17, B-1000 Brussels 2017 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members. Ref. No. EN 50849:2017 E BS EN 50849:2017EN 50849:2017 (E) 2 Contents Page European foreword 4 Introduction . 5 1 Scope . 6 2 Normative references. 6 3 Terms an
11、d definitions 6 4 General system requirements . 8 4.1 Principal features . 8 4.2 Responsible person . 9 4.3 Priorities 9 4.4 Safety requirements . 10 5 System technical requirements 10 5.1 Speech intelligibility 10 5.2 Automatic status indication 11 5.3 Automatic fault monitoring .11 5.4 Monitoring
12、of software controlled equipment 12 5.5 Interface with an emergency detection system 12 5.6 Power supplies .13 5.7 Climatic and environmental conditions 13 5.8 Marking and symbols for marking .14 6 Installation requirements 14 7 System operation .14 7.1 Instructions for operation .14 7.2 Records to
13、be kept.15 7.3 Maintenance .15 7.3.1 General15 7.3.2 Maintenance instructions .16 Annex A (informative) Measurement of speech intelligibility .17 A.1 Introduction 17 A.2 Methods of measurement .17 A.3 Limitations of the methods .18 A.4 Correlation of the results of the various methods .19 Annex B (n
14、ormative) Intelligibility measurement methods .20 B.1 General 20 B.2 Status of the sound system 20 B.3 Number of measurements and calculation of the result .20 BS EN 50849:2017EN 50849:2017 (E) 3 B.4 Ambient noise 21 B.5 Test signal 21 B.6 Records .22 Annex C (normative) Attention-drawing audible si
15、gnals 23 C.1 Introduction 23 C.2 Audibility of attention-drawing signals .23 C.3 Attention-drawing signal level measurement method .23 C.4 Ambient noise level measurement method 23 C.5 Assessment 24 Bibliography . 25 BS EN 50849:2017EN 50849:2017 (E) 4 European foreword This document (EN 50849:2017)
16、 has been prepared by CLC/BTTF 133-1 “Sound systems for emergency purposes which are not part of fire detection and alarm systems”. The following dates are fixed: latest date by which this document has to be implemented at national level by publication of an identical national standard or by endorse
17、ment (dop) 2018-03-03 latest date by which the national standards conflicting with this document have to be withdrawn (dow) 2020-03-03 This document supersedes EN 60849:1998. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CENELEC
18、 shall not be held responsible for identifying any or all such patent rights. EN 50849:2017 includes the following significant technical changes with respect to EN 60849:1998: Annex A, Measurement of speech intelligibility, has been brought up to date in line with EN 60268-16; emergency sound system
19、s for use in case of a fire emergency are excluded from the scope of this standard. Emergency sound systems for use in case of fire emergency are covered by CEN/TS 54-32 1, EN 54-16 and by national, regional or local regulations 2. Components that have been certified to EN 54-16 2 and EN 54-24 3 can
20、 be expected to be suitable for use in a sound system for emergency purposes that complies with this standard. CEN/TS 54-32 provides guidance for sound systems for emergency purposes which are to be used for evacuation in case of a fire emergency. BS EN 50849:2017EN 50849:2017 (E) 5 Introduction Thi
21、s European Standard introduces a new approach to the assessment of system intelligibility compared with EN 60849, the standard on which it is based. Over recent years, the Speech Transmission Index STI has been the most commonly used method for determining intelligibility of emergency sound systems.
22、 Other methods have rarely been applied. For this reason, it was decided to express the required intelligibility score by using the STI scale. The intelligibility requirements in 5.1 and Annex A have been changed in line with this. Furthermore, the RASTI measurement method has been removed from this
23、 standard because it does not give accurate results. This residual standard based on EN 60849 is intended to remove any requirements that conflict with the EN 54 series of fire detection and fire alarm standards, including EN 54-16 for voice alarm systems control and indicating equipment and EN 54-2
24、4 for voice alarm systems loudspeakers. BS EN 50849:2017EN 50849:2017 (E) 6 1 Scope This European Standard specifies the performance requirements for sound systems which are primarily intended to broadcast information for the protection of lives within one or more specified areas in an emergency. It
25、 also gives the characteristics and the methods of test necessary for the specification of the system. This European Standard applies to sound reinforcement and distribution systems to be used to effect a rapid and orderly mobilization of occupants in an indoor or outdoor area in an emergency, inclu
26、ding systems using loudspeakers to broadcast voice announcements for emergency purposes and attention-drawing or alarm tone signals. This European Standard does not apply to emergency sound systems used for evacuation in case of fire emergency, whether connected to a fire detection and fire alarm sy
27、stem or not. NOTE 1 The use of the system for normal sound reinforcement and distribution systems purposes under non-hazardous circumstances is not excluded. It is recommended that the system, when used for emergency purposes, should form part of a complete facility (equipment, operating procedures
28、and training programmes) for the control of emergencies. NOTE 2 Sound systems for emergency purposes may be the subject of approval by relevant authorities. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its
29、application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 60065, Audio, video and similar electronic apparatus Safety requirements (IEC 60065) EN 60068-1, Environmental testing - Par
30、t 1: General and guidance EN 60079 (all parts), Explosive atmospheres (IEC 60079 series) EN 60268-16, Sound system equipment - Part 16: Objective rating of speech intelligibility by speech transmission index IEC 60364 (all parts), Low-voltage electrical installations 3 Terms and definitions For the
31、purpose of this document, the following terms and definitions apply. 3.1 alarm signal, or condition, warning of an emergency 3.2 area of coverage area, inside and/or outside a building, where the system meets the requirements laid down in this standard Note 1 to entry: Certain parts of an area of co
32、verage may be excluded, see 5.1. BS EN 50849:2017EN 50849:2017 (E) 7 3.3 audibility property of sound which allows it to be heard among other sounds Note 1 to entry: At present for objective analysis, for example when using the STI equation (see EN 6026816), the concept of audibility takes account o
33、f the relative loudness and frequency content of the sound in comparison with other sounds present at the same time. 3.4 clarity property of a sound which allows its information-bearing components to be distinguished by a listener Note 1 to entry: It is related to the freedom of the sound from disto
34、rtion of all kinds. There are three kinds of distortion involved in the reduction of clarity of a speech signal in an electro acoustic system: a) amplitude distortion, due to nonlinearity in electronic equipment and transducers; b) frequency distortion, due to non-uniform frequency response of trans
35、ducers and selective absorption of high frequencies in acoustic transmission; c) time domain distortion, due to reflection and reverberation in the acoustic domain. 3.5 critical signal path physical connection, external to the cabinet of the emergency sound system, for the transmission of informatio
36、n and/or power between parts of an emergency sound system contained in different cabinets 3.6 danger risk of harm or damage 3.7 emergency imminent risk or serious threat to persons or property 3.8 emergency loudspeaker zone part of the area of coverage to which emergency information can be given sep
37、arately 3.9 information speech or intended audio signal 3.10 intelligibility measure of the proportion of the content of a speech message that can be correctly understood Note 1 to entry: Satisfactory intelligibility requires adequate audibility and adequate clarity. 3.11 loudspeaker zone part of th
38、e area of coverage to which information can be given separately 3.12 acoustically different area ADA subdivision of an emergency loudspeaker zone, that may be an enclosed or otherwise physically defined space, characterised by an individual reverberation time and/or ambient noise level BS EN 50849:2
39、017EN 50849:2017 (E) 8 3.13 warning important notice concerning any change of status which demands attention or activity 3.14 attentiondrawing-signal tone that is broadcasted to attract attention at the start of an emergency message Note 1 to entry: The level of the attention-drawing-signal is measu
40、red using the A-weighted equivalent continuous sound pressure level method, LA,egT. 4 General system requirements 4.1 Principal features A sound system for emergency purposes shall permit the broadcasting of intelligible information of measures to be taken for the protection of lives within one or m
41、ore specified areas of coverage. The following criteria shall be fulfilled: a) When any alarm occurs, the system shall immediately disable or override any functions not connected with its emergency role (such as paging, music or general pre-recorded announcements being broadcast to the loudspeaker z
42、ones requiring emergency broadcasts), except where specifically required, and agreed by the interested parties. b) Unless damaged as a result of the emergency or undergoing repair or maintenance, the system shall be available for operation at all times (or as required by the system specification). I
43、n the event of unavailability due to repair or maintenance, suitable provisions shall be made for alternative methods of communication under all prevailing circumstances until the system is restored to full functionality. c) The system shall be capable of broadcasting a first attention-drawing signa
44、l within 3 s of being placed in an emergency mode by the operator, or automatically on receipt of a signal from an emergency detection system. In the latter case, the period of 3 s does not include the reaction time of the detection system from the time the emergency is first detected, to commanding
45、 the alarm broadcast. d) The system shall be able to broadcast attention-drawing signals and speech messages to one or more areas simultaneously. There shall be at least one appropriate attention-drawing signal alternating with one or more speech messages for this purpose. e) At any time the system
46、operator shall be able to receive, by means of a monitoring system, indications of the correct functioning or, otherwise, indications of failures in the critical signal path (see also 5.2 and 5.3).The monitoring system shall indicate the failure of an amplifier or of a loudspeaker circuit. f) Failur
47、e of a single amplifier or loudspeaker circuit shall not result in loss of coverage in more than one loudspeaker zone. g) An attention-drawing signal shall precede the first message for 4 s to 10 s. Successive signals and messages shall then continue until either changed in accordance with the evacu
48、ation procedure, or until manually silenced. The interval between successive messages shall not exceed 30 s and attention-drawing signals shall be broadcast whenever periods of silence might otherwise exceed 10 s. Where more than one attention-drawing signal is used, such as those used for different
49、 types of emergency, each signal shall be clearly distinguishable in character. BS EN 50849:2017EN 50849:2017 (E) 9 h) All messages shall be clear, short, unambiguous and as far as practicable, pre-planned. Where pre-recorded messages are used, they shall be held in a non-volatile solid-state store, and be continuously monitored for availability. The system design shall make it inherently impossible for an external source to corrupt or derange the store or its contents. i) The content of all messages and the language(s) used shall be specified and/or a
