ISO INTERNATIONAL STANDARD 7240-24 Second edition 2016-04-15 Fire detection and fire alarm systems - Part 24: Fire alarm loudspeakers Systemesdedétection d'incendie et d'alarme- Partie24:Haut-parleurs pour systemes d'alarme vocale Referencenumber IS0 7240-24:2016(E) iso @ ISO 2016 Copyright Intemafional Organization for Standardization se with ISO i001, User=bao, zhou IS07240-24:2016(E) COPYRIGHTPROTECTEDDOCUMENT IS0 2016, Published in Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying,or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below or ISo's member body in the country of the requester. ISO copyright office Ch. de Blandonnet 8. CP 401 CH-1214 Vernier, Geneva, Switzerland Tel. +41 22 749 01 11 Fax +41 22 749 09 47 copyright@iso.org www.iso.org ISO 2016-All rights reserved rovided by IHS under icenseeUniversita di Bologna/5930975001, User=bao, zhou networking permited without licanse trom IHS Not for Resale, 05/15/2016 23:08:37 MD IS07240-24:2016(E) Contents Page Foreword ..V Introduction. ..vii 1 Scope. 2 Normativereferences 3 Terms,definitions,symbolsandabbreviatedterms 3.1 Terms and definitions .2 3.2 Abbreviated terms 4 Requirements ..4 4.1 Compliance. 4 4.2 Frequency response limits. .5 4.3 Durability 5 .5 4.4 Construction 4.4.1 Provisionforexternal conductors .5 4.4.2 Materials .6 4.4.3 Ingress protection. 6 .6 4.4.4 Access 5 Tests .6 5.1 General .6. 5.1.1 Atmosphericconditionsfortests 6: 5.1.2 Operating conditions for tests.. .6. 5.1.3 Mounting arrangements. .7 5.1.4 Tolerances. 5.1.5 Frequencyresponsemeasurement and sensitivitycalculation .7 5.1.6 Frequency response measurement and sensitivity calculationfor loudspeakersrequiringdedicated systemequalization .8 5.1.7 Provisionfortests .8 5.1.8 Test schedule .9 5.2 Reproducibility .10 5.2.1 Object of the test .10 5.2.2 Test procedure. .10 5.2.3 Requirements ..10 5.3 Rated impedance. .10 5.3.1 Object of the test .10 5.3.2 Test procedure. .10 5.3.3 Requirements ..11 5.4 Horizontal and vertical coverage angles ..11 5.4.1 Object ofthetest .11 5.4.2 Test procedure .11 5.4.3 Requirements .12 5.5 Maximum sound pressure level .12 5.5.1 Object of the test. .12 5.5.2 Test procedure .12 5.5.3 Requirements .13 5.6 Rated noise power (durability) .13 5.6.1 Object of the test. .13 5.6.2 Test procedure ..13 5.6.3 Requirements ..13 5.7 Dry heat (operational) .14 5.7.1 Object of the test .14 5.7.2 Test procedure ..14 5.7.3 ..14 Requirements 5.8 Dry heat (endurance) .14 iii Provided by IHS under license with ISO ersita di Bologna/5930975001, User=bao, zhou ithout license from IHS