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 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, including 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 system or not.

NOTE 1

The use of the system for normal sound reinforcement and distribution systems purposes under nonhazardous 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 and training programmes) for the control of emergencies.

NOTE 2

Sound systems for emergency purposes may be the subject of approval by relevant authorities.

PDF Catalog

PDF Pages	PDF Title
8	1 Scope 2 Normative references 3 Terms and definitions
10	4 General system requirements 4.1 Principal features
11	4.2 Responsible person 4.3 Priorities 4.3.1 Classification of priorities
12	4.3.2 Operational priorities 4.4 Safety requirements 5 System technical requirements 5.1 Speech intelligibility
13	5.2 Automatic status indication 5.3 Automatic fault monitoring
14	5.4 Monitoring of software controlled equipment 5.5 Interface with an emergency detection system
15	5.6 Power supplies 5.7 Climatic and environmental conditions
16	5.8 Marking and symbols for marking 6 Installation requirements 7 System operation 7.1 Instructions for operation
17	7.2 Records to be kept 7.3 Maintenance 7.3.1 General
18	7.3.2 Maintenance instructions
19	Annex A (informative)Measurement of speech intelligibility A.1 Introduction A.2 Methods of measurement A.2.1 Speech transmission index A.2.2 Phonetically-balanced word scores A.2.3 Modified rhyme test
20	A.2.4 Speech Intelligibility Index A.2.5 Articulation Index A.2.6 Articulation loss of consonants A.3 Limitations of the methods A.3.1 General A.3.2 Speech Transmission Index (STI) A.3.3 Phonetically balanced word scores (256 and 1 000 population) A.3.4 Modified rhyme test A.3.5 Speech intelligibility index A.3.6 Articulation loss of consonants
21	A.4 Correlation of the results of the various methods
22	Annex B (normative)Intelligibility measurement methods B.1 General B.2 Status of the sound system B.3 Number of measurements and calculation of the result
23	B.4 Ambient noise B.5 Test signal
24	B.6 Records
25	Annex C (normative)Attention-drawing audible signals C.1 Introduction C.2 Audibility of attention-drawing signals C.3 Attention-drawing signal level measurement method C.4 Ambient noise level measurement method
26	C.5 Assessment

Published By	Publication Date	Number of Pages
BSI	2017	30


PDF Format	Searchable	Printable	Preview Now

Status	Definitive
Pages	30
Publication Date	2017-03-31
ISBN	978 0 580 87714 8
Standard Number	BS EN 50849:2017
Title	Sound systems for emergency purposes
Identical National Standard Of	EN 50849:2017
Replaces	BS EN 60849:1998
Descriptors	Speech transmission systems, Communication equipment, Noise (spurious signals), Performance testing, Maintenance, Electric power systems, Instructions for use, Telecommunication systems, Public-address systems, Installation, Acoustic measurement, Automatic control systems, Audio systems, Priority, Records (documents), Acoustoelectric devices, Emergency equipment
Publisher	BSI
Committee	EPL/100
ICS Codes	13.320 - Alarm and warning systems

BS EN 50849:2017

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BS EN 50849:2017 ExComm (Fire)