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1、BRITISH STANDARD BS 7443:1991 Incorporating Amendment No. 1 Specification for Sound systems for emergency purposes Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 10:43:54 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7443:1991 This British Standard, having been
2、 prepared under the direction of the Electronic Equipment Standards Policy Committee, was published under the authority of the Standards Board and comes into effect on 28 June 1991 BSI 06-1999 The following BSI references relate to the work on this standard: Committee reference EEL/32 Draft for comm
3、ent 87/23520 DC ISBN 0 580 19697 6 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Electronic Equipment Standards Policy Committee (EEL/-) to Technical Committee EEL/32, upon which the following bodies were represented: Association of Br
4、itish Theatre Technicians Association for Consumer Research (ACRE) Audio Engineering Society British Educational Equipment Association British Kinematograph, Sound and Television Society British Radio and Electronic Equipment Manufacturers Association British Telecommunications plc Consumer Policy C
5、ommittee of BSI Federation of British Audio Independent Broadcasting Authority Independent Television Association Institution of Electrical Engineers National Council for Educational Technology (NCET) Professional Lighting and Sound Association Radio Electrical and Television Retailers Association R
6、oyal Institute of British Architects Royal National Institute for the Deaf Society of Cable Television Engineers Sound and Communication Industries Federation Amendments issued since publication Amd. No.DateComments 7675June 1993Indicated by a sideline in the margin Licensed Copy: London South Bank
7、University, London South Bank University, Fri Dec 08 10:43:54 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7443:1991 BSI 06-1999i Contents Page Committees responsibleInside front cover Forewordii 1Scope1 2Object1 3References to relevant international standards1 3.1IEC Publications1 4Explanation of
8、terms1 4.1Electrical supervision1 4.2Area of coverage1 4.3Paging zone2 4.4Information2 4.5Audible information2 4.6Intelligible information2 4.7Danger and warning signals2 4.8Alarm2 4.9Warning2 4.10Danger2 4.11Emergency2 5General requirements2 5.1System requirements2 5.2Units2 5.3Marking and symbols
9、for marking2 5.4Environmental conditions3 5.5Interference3 5.6Safety requirements3 5.7Electrical matching values3 6System requirements3 6.1General3 6.2Microphones4 6.3Overall system requirements5 6.4Power supply5 6.5Monitoring facilities5 6.6Automatic priority switch6 7Installation requirements6 8Sy
10、stem operation6 8.1Instructions for operation6 8.2Records6 8.3Maintenance6 Figure 1 Schematic representation of a sound system for emergency purposes4 Figure 2 Microphone frequency response, tolerance field5 Publication(s) referred toInside back cover Licensed Copy: London South Bank University, Lon
11、don South Bank University, Fri Dec 08 10:43:54 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7443:1991 ii BSI 06-1999 Foreword This British Standard has been prepared under the direction of the Electronic Equipment Standards Policy Committee and is technically equivalent to IEC 849:1989 “Sound syste
12、ms for emergency purposes”, published by the International Electrotechnical Commission (IEC). The difference between the two standards lies in the omission in 4.7 of BS 7443 of the references to ISO 7731 and ISO 8201 which appear in IEC Publication 849, and the corresponding omission in BS 7443 of 3
13、.2 of IEC Publication 849, which lists these ISO Publications. A second sentence in 5.5.2, referring to CISPR 11 and CISPR 13, has also been omitted as the question of which EMC standards should apply to emergency sound systems is currently under consideration and the referenced standards are no lon
14、ger considered to be appropriate. Reference to these standards has also been omitted from 3.1. For ease of production, the IEC text has been retained. Cross-references International standardCorresponding British Standard IEC 68BS 2011 Environmental testing (Most Parts identical or technically equiva
15、lent) IEC 73:1984BS 4099 Colours of indicator lights, push buttons, annunciators and digital readouts Part 1:1986 Specification for colours of indicator lights and push buttons (Identical) IEC 268-4:1972BS 6840 Sound system equipment Part 4:1987 Methods for specifying and measuring the characteristi
16、cs of microphones (Identical) IEC 268-15:1987Part 15:1988 Specification for matching values for the interconnection of sound system components (Identical) IEC 268-16:1988Part 16:1989 Guide to the “RASTI” method for the objective rating of speech intelligibility in auditoria (Identical) IEC 417:1973B
17、S 6217:1981 Guide to graphical symbols for use on electrical equipment (Identical) IEC 801-3:1984BS 6667 Electromagnetic compatibility for industrial-process measurement and control equipment Part 3:1985 Method of evaluating susceptibility to radiated electromagnetic energy (Identical) British Stand
18、ards referred to: BS 5839Fire detection and alarm systems for buildings BS 5839-1:1988Code of practice for system design, installation and servicing BS 5839-4:1988Specification for control and indicating equipment Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08
19、10:43:54 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7443:1991 BSI 06-1999iii The Technical Committee has reviewed the provisions of IEC 27, IEC 79, IEC 364 and IEC 621 to which reference is made in the text and has decided that they are acceptable for use in conjunction with this standard. All pa
20、rts of IEC 79 are related to Parts of BS 5501 which implement CENELEC EN 50014, EN 50015, 50016, EN 50017, EN 50018, EN 50019, EN 50020, EN 50028 and EN 50039. All parts of IEC 621 are related to Parts of BS 6907. IEC 65:1985, to which reference is made in the text, has been harmonized by CENELEC un
21、der HD 195 and is implemented by BS 415:1990 which is a related British Standard. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself
22、 confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i to iv, pages 1 to 6, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indic
23、ated in the amendment table on the inside front cover. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 10:43:54 GMT+00:00 2006, Uncontrolled Copy, (c) BSI iv blank Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 10:43:54 GMT
24、+00:00 2006, Uncontrolled Copy, (c) BSI BS 7443:1991 BSI 06-19991 1 Scope This standard applies to sound reinforcement and distribution systems to be used to effect a rapid and orderly mobilization of occupants in an indoor and/or outdoor area affected by a hazard. NOTE 1The use of the system for no
25、rmal sound reinforcement purposes under non-hazardous circumstances is not excluded. NOTE 2It is recommended that the system, when used for emergency purposes, form part of a complete facility (equipment, operating procedures and training programmes) for the control of emergencies. NOTE 3Sound syste
26、ms for emergency purposes may be the subject of approval by relevant authorities. NOTE 4If a sound system within the scope of this standard is used to deliver audible alarms of fire, its design and installation should be in accordance with BS 5839-1 and BS 5839-4. 2 Object The purpose of this standa
27、rd is to specify the requirements for sound systems which are primarily intended to broadcast information for the protection of lives and property within a protected area when an emergency situation has occurred. The standard gives the characteristics and the methods of test necessary for the specif
28、ication of the system. 3 References to relevant international standards 3.1 IEC Publications 4 Explanation of terms For the purpose of this standard, the following definitions shall apply. 4.1 electrical supervision an arrangement within the system by which any condition of the system which would in
29、terfere with its operation is automatically indicated 4.2 area of coverage the area, inside and/or outside a building, where the system meets the requirements laid down in this standard 27:Letter symbols to be used in electrical technology. 65 (1985):Safety requirements for mains operated electronic
30、 and related apparatus for household and similar general use. 65 (1987):Amendment No. 1. 68:Basic environmental testing procedures. 73 (1984):Colours of indicator lights and push-buttons. 79:Electrical apparatus for explosive gas atmospheres. 268:Sound system equipment. 268-4 (1972): Part 4: Microph
31、ones. 268-15 (1987):Part 15: Preferred matching values for the interconnection of sound system components. 268-16 (1988):Part 16: The objective rating of speech intelligibility in auditoria by the “RASTI” method. 364:Electrical installations of buildings. 417 (1973):Graphical symbols for use on equi
32、pment. Index, survey and compilation of the single sheets. Supplements A to H. 621:Electrical installations for outdoor sites under heavy conditions (including open-cast mines and quarries). 801:Electromagnetic compatibility for industrial-process measurement and control equipment. 801-3 (1984): Par
33、t 3: Radiated electromagnetic field requirements. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 10:43:54 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7443:1991 2 BSI 06-1999 4.3 paging zone any part of the area of coverage to which information can be given se
34、parately 4.4 information any speech or audio signal 4.5 audible information any information that can be heard 4.6 intelligible information any audible information that can be distinguished and understood 4.7 danger and warning signals information including auditory danger signals 4.8 alarm sudden at
35、tention or action for protection of persons or property 4.9 warning important notice concerning a change of status which demands attention or activity 4.10 danger risk of harm or damage 4.11 emergency imminent risk or serious threat to persons or property 5 General requirements 5.1 System requiremen
36、ts A sound system to be used for emergency purposes shall provide the possibility to broadcast information on measures to be taken for the protection of lives and property within an area of coverage. The following criteria shall be fulfilled: the system shall be operable at all times and under hazar
37、dous conditions that may be expected; the system shall be able to broadcast at least one sequence of a danger signal and one relevant speech message of at least 30 s after the onset of the emergency; the system shall have adequate protection against broadcasting false danger signals; when the evacua
38、tion procedure requires, the system shall be capable of being divided into paging zones. An automatic system for continually checking the correct functioning of the system shall be provided. 5.2 Units The International System of Units (SI) is used exclusively in this standard. 5.3 Marking and symbol
39、s for marking Terminals and controls shall be adequately marked to give information regarding their function, characteristics and polarity. The marking shall be such that it shall be possible to adjust the controls and to identify their positions with sufficient accuracy in relation to the informati
40、on given in the user instructions. Marking shall preferably be composed of letter symbols, signs, numbers and colours which are internationally intelligible. Reference is made to IEC 27 and IEC 417. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 10:43:54 GMT+00
41、:00 2006, Uncontrolled Copy, (c) BSI BS 7443:1991 BSI 06-19993 Marking not included in these standards shall be clearly explained in the user instructions. 5.4 Environmental conditions As the system may be installed inside or outside buildings, under various environmental conditions and exposed to p
42、ossibilities of mechanical damage, full information on the conditions under which the system is required to operate shall be included in the system specification. For tests, reference shall be made to IEC 68. For conditions regarding electromagnetic and magnetic interference, see Sub-clause 5.5. Whe
43、n not otherwise specified, the system shall operate under the following climatic conditions: 5.5 Interference 5.5.1 Electromagnetic interference from external sources The system shall have protection against electromagnetic interference. Unless otherwise specified, external interference sources havi
44、ng a field strength of maximum 1 V/m caused by a carrier wave in the band 30 kHz to 500 MHz, amplitude modulated to a maximum of 30 % with a 1 000 Hz signal, shall produce an A-weighted equivalent input noise level not higher than 40 dB below the rated input level. For more specific identification a
45、nd evaluation of potential radiated field environments, reference is required to IEC 801-3. 5.5.2 Electromagnetic radiation from the system The radiation may be subject to statutory requirements. 5.5.3 Magnetic interference Unless otherwise specified, external interference sources having a magnetic
46、field strength of: 1A/m at a frequency of 40 Hz to 80 Hz 0.2 A/m at a frequency of 80 Hz to 200 Hz 0.1 A/m at a frequency of 200 Hz to1 kHz shall produce an A-weighted equivalent input noise level not higher than 40 dB below the rated input level. 5.6 Safety requirements The system shall comply with
47、 the safety requirements of IEC 65 and IEC 364 or with other appropriate IEC safety standards. The mechanical construction of any part of the system under the influence of heat, explosion or implosion shall not cause injury to any person. Where systems have to be installed in special areas, such as
48、areas with explosive atmospheres, the relevant special safety requirements shall be met. 5.7 Electrical matching values For the electrical matching values, reference is made to IEC 268-15 unless otherwise specified. 6 System requirements 6.1 General In Figure 1 a schematic representation is given of
49、 a sound system for emergency purposes. If the basic system is used for other functions in addition to emergency purposes, emergency signals and emergency messages shall have automatic priority. In the case of auxiliary input an automatic priority switch shall be provided to switch on and power the emergency system, when necessary. Additional equipment such as a voice logger, a speech generator or a danger and warning generator may be included in the system. The central processor provides for the necessary processing of the signals. At any time the system operator s