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EN-60849

EN-60849. EMERGENCY PURPOSES Voice Alarm SYSTEMS. NORM DESCRIPTION. APLICATION. Object PA systems used to alarm in emergency situations. Main performances.

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EN-60849

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  1. EN-60849 EMERGENCY PURPOSES Voice Alarm SYSTEMS. NORM DESCRIPTION

  2. APLICATION • Object • PA systems used to alarm in emergency situations. • Main performances. • 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 more specified areas.“ EN-60849

  3. ~ ~ Alarm generation Ampli-fiers Lines Loudspeaker DEFINITIONS • Terms • Alarm • a signal, or condition, warning of an emergency” • e.g.: evacuation advice • Warning • important notice concerning any change of status which demands attention or activity “ • e.g. hint that an emergency may happen • Critical Signal Path • all components and interconnections between every emergency broadcast initiation point and the input terminals on, or within, each loudspeaker enclosure.” FDS EN-60849

  4. Requirements on equipments Concerning the manufacturer EN-60849

  5. FUNCTIONS AVAILABILITY • Continuous Availability [4.1b] • The PA system shall be available all times • Availability within 10 seconds after supplying power to the system [4.1c] • primary or secondary power • Maximum 3 Seconds from initiation until first emergency broadcast [4.1d] • including reaction time of the detection system EN-60849

  6. CD FDS PA central ALARMING PRIORITY • Highest Priority for Alarming [4.1a] • disabling all other (general) PA functions FDS: Fire Detection System EN-60849

  7. EMERGENCY PRIORITIES [4.3] • Manual Alarming/Warning/Restoration • >Automatic Alarming (evacuation) • >Automatic Warning • >no emergency: operational messages(e.g. for system check) EN-60849

  8. MANUAL INTERVENTION • If the voice alarm system is capable of operation in fully automatic mode, a manual intervention shall always be possible: [4.3.2] • starting and stopping of prerecorded alarm messages [4.3.2a] • selection of appropriate prerecorded alarm messages [4.3.2b] • when using specific emergency messages, indication of which message and their relation to zones must be displayed [5.2.d] • paging by using the emergency microphone (if any) [4.3.2d] • selection of zones for prerecorded message or paging [4.3.2c] EN-60849

  9. Automatic Status Indication • “A clear indication shall automatically be given at the designated control locations of:“ [5.2] • (the designated control location can be the fireman‘s microphone) • “system availability“ [5.2 a] • “power supply availability“ [5.2 b] • “any fault condition“ [5.2 c] • systems with several zones: current message broadcast into which zones:Alert, Evacuation, paging EN-60849

  10. Failure Indication (1) • Indication of Failures [5.3] • Failures must be indicated automatically at an designated place (e.g. main system) • The failure shall be indicated within 100 seconds after occurance. • The failure shall be indicated acoustically and visually. • A receipt button and a reset button must be available. EN-60849

  11. Failure Indication (2) • Indication [5.3] • Visual and acoustic indication • tone of 0.5 seconds duration, min. once within 5 seconds • permanent or flashing visual indicator • Manual reception by personal • tone disappears • visual indicator remains / changes to permanent on • Reset of failure indication after failure recovery • visual indicator extinguishes automatically - or - • visual indicator extinguishes after manual reset • visual indicator shall extinguish after failure recovery ! • Acoustic tone must start again when other failure detected EN-60849

  12. Surveillance (1) • An automatic Surveillance must indicate each detected failure • The surveillance system tests • Components of the “critical signal path “ (sources, amplifiers, cables etc.) • the power supply • primary supply [5.3a] • secondary supply [5.3b] • battery charger [5.3c] • failure of protection circuits which may prevent the an emergency broadcast • e.g. fuse, circuit breaker, isolator [5.3d] • control circuits (processor etc.) EN-60849

  13. Surveillance (2) • Failure of elements of the critical signal path • failure of microphone [5.3e] • (voice coil, pre-amplifier, wiring) • failure of the critical signal path through amplifiers [5.3f] • missing of amplifiers or critical modules [5.3g] • failure of standby amplifier [5.3h] • failure of tone generator or message memory [5.3i] • failure of speaker circuits [5.3j] • (short circuit, break) • failure of connection between decentralised systems [5.3 o] • failure of connection between PA system and emergency detection system • usually this surveillance is done by the emergency detection system [5.5] EN-60849

  14. Monitoring of the Microphone • Microphone monitoring methods • Electrical monitoring : • Disadvantage: conversion from sound to voltage can not be monitored, e.g. when the diaphragm is damaged • Acoustic monitoring • a sound generator sends an acoustic signal to the capsule • the acoustic and electric function of the capsule is monitored  very safe method ! EN-60849

  15. MonitoringSpeaker Circuits (1) • Methods of Speaker Circuit Surveillance • (remind that the critical signal path ends at the speaker’s connector) • 1. Monitoring with DC current advantage:star wiring possible. disadvantage:speakers must be modified or special speakers must be used; not suitable for existing speaker circuits EN-60849

  16. Signal + Test signal (low frequency) Monitoring Speaker Circuits (2) • 2. Impedance Monitoring(used often) Impe-dance measuring Advantage:connection of different 100 volts speakers possible; star wiring possible; expansion of old systems possible Disadvantage:Restriction when many speakers are connected on a line: a line break causing a few speakers to be cut off can not be detected because practically only high impedance deviation can be detected correctly (the speakers impedance can become 30% higher when the voice coil is hot !) EN-60849

  17. Signal + Test signal (high frequency) Monitoring Speaker Circuits (3) • 3. Loop Back Pilot tone detector Advantage:connection of different 100 volts speakers possible; very safe method Disadvantage:star wiring not possible or difficult (line must be installed from speaker to speaker); expansion of old systems complicated when star wiring was used, line back necessary EN-60849

  18. end of line unitf1f2 Signal + Test signal f1(high frequency) Pilot tone detector f1, f2 Monitoring Speaker Circuits (4) • 4. Back Signal on Same Line Advantage: connection of different 100 volts speakers possible, no line back necessary;very safe method Disadvantage: star wiring not possible (line must be installed from speaker to speaker); expansion of old systems complicated when star wiring was used; practical problem: installation site of the end of line unit often not in documents (can not be found) EN-60849

  19. Evacuation Message Memory • Safety Against External Influence • Pre-recorded messages and eventually attention-drawing signals • must be stored in a non-volatile memory (solid state memory, no mechanical devices) [4.2i] • availability must be monitored continuously • external sources shall not be able to corrupt or derange the store or its contents EN-60849

  20. Requirements On The Installation Concerning the Installer EN-60849

  21. Interface With Emergency Detection System [5.5] • Continuous Monitoring • The communication link between the emergency detection system and the sound system is normally monitored by the emergency detection system • Notifications to the Emergency Detection System • The sound system must transfer minimum one fault information (any failure) to the emergency detection system EN-60849

  22. Security Functions • Redundant Facilities • Keeping the Power [4.1m] • an emergency power supply must be installed always • Keeping the Broadcast [4.1g] • “Failure of a single amplifier or loudspeaker circuit shall not result in total loss of coverage in the loudspeaker area served.” • architecture of the speaker circuit • configuration power amplifiers • Exception: regional directives for small buildings EN-60849

  23. Emergency Power Supply • Battery’s Capacity [5.6] • Loss of AC mains at evacuation: • double evacuation time • minimum 30 minutes for emergency mode • Loss of AC mains without evacuation: • minimum 24 hours (normal operation) • When a building is not used for a longer period (e.g. weekend), then the system must be capable to operate the emergency mode for minimum 30 minutes after re-occupation of the building(e.g. 72 hours standby plus 30 minutes emergency mode). • Refer to British Standard BS5839: part 8, for battery capacity calculation. EN-60849

  24. A B standby switch line cut switch standby amplifier Keeping of Broadcast (1) • Electric Solution: A/B-Wiring • Two-Line System • In case of failure of one line, the other line still serves the remaining speakers A/B-wiring with 2amplifiers A/B-wiring with standby amplifier EN-60849

  25. A B A B Keeping of Broadcast (2) Example: wide area • Acoustic Solution: • Connection of speakers by turns on the lines A and B in each direction • In case of a line’s failure, the speaker area keeps served adequate (small gaps of coverage only) Example: corridor EN-60849

  26. Divided Emergency Speaker Zones • Emergency Speaker Zones [4.1k] • Division into areas depending on evacuation method • responsible: authorities • Criterias for Division [4.1l] • 1) neighbour zones shall not disturb • 2) maximum one loudspeaker zone per emergency detection zone • responsible: authorities, planer . EN-60849

  27. Sound pressure level 120 dBA Max. Alarm signal level 6 - 20 dBA Noise level 75 dBA Quiet level 65 dBA Min. level Sound Pressure Level -1- • Attention-Drawing Signals[Annex C] • minimum: 65 dBA, in rest areas: 75 dBA • 6 - 20 dBA above background noise • maximum: 120 dBA • the sound pressure levels of all relevant areas must be confirmed and being documented [7.2 a] z.B. 100 dBA z.B. 90 dBA EN-60849

  28. Sound Pressure Level -2- Messages • The standard does not write specific value for the sound pressure level of the reports. Instead it prescribes a specific value of the intelligibility . EN-60849

  29. Intelligibility • Intelligibility of Messages • The Intelligibility of messages must be equal or higher than 0.7 CIS (common intelligibility scale; STI: 0,5) [5.1] • This value must be obtained in each area [5.1] • In a difficult acoustic environment, it is preferable to carry out an acoustical simulation • Measuring and Documentation of Intelligibility • Confirmation of intelligibility must be documented [7.2 a] • Application of acknowledged with restrictions [Anhang A] • Correlation curves to CIS in [Annex B] • A specialised company may measure the intelligibility EN-60849

  30. Alarm Signals -1- • Attention-Drawing Signal • minimum one suitable attention-drawing signal before message (refer to EN 457) [4.1 e] • Distinguishable attention-drawing signals at different emergency cases [4.1 h] • Attention-Drawing Signals and Messages [4.1 h] • attention-drawing signal before message, 4-10 seconds • duration of attention-drawing signal and messages until change or end of evacuation • max. 30 seconds between different messages • pauses > 10 seconds: attention-drawing signal EN-60849

  31. Alarm Signals -2- • Pre-recorded messages • All messages must be clear, short and pre-planned. • Lenguage • Buyer should specify the used language(s). EN-60849

  32. Documentation -1- • Operation Manual [7.1] • must be quickly available(preferable at each operation place) • Contents: • practical operation of the system • action to be taken in case of system failure • Performance • graphically if possible • in preferred language • bound document (copy) EN-60849

  33. Documentation -2- • System Documentation [7.2a] • To be kept by User or Maintenance Company • Contents: • locations of each part of the devices • measuring results of the system • Impedance of each speaker circuit • set values (when adjustable, e.g. volume) • sound pressure level(s) • intelligibility EN-60849

  34. Documentation -3- • Maintenance Instructions [7.3.2] • To be kept by User or MaintenanceCompany • Contents: • Maintenance procedures (order of works) • Maintenance intervals • Parts for maintenance, spare parts, special tools • Suppliers • eventually test certificates EN-60849

  35. Requirements on the Operation Concerns the user EN-60849

  36. Documentation -4- • Log Book [7.2b] • Responsible person must take care on it • Contents: • details of all emergency cases • details of tests and routine checks • details of occurred failures and the repair EN-60849

  37. Security of Operation • Maintenance [7.3.1] • should be done twice a year (maintenance and test) • to be carried out by competent person • Responsible person [4.2] • nominated by owner • is responsible for maintenance • must be trained • manages the log book EN-60849

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