ISO INTERNATIONAL STANDARD 7240-24 Second edition 2016-04-15 Fire detection and fire alarm systems - Part 24: Fire alarm loudspeakers Systemes de détection d'incendie et d'alarme Partie 24: Haut-parleurs pour systemes d'alarme vocale Reference number IS0 7240-24:2016(E) ISO International Organization for Standardization see=ZHEJIANG INST OF STANDARDIZATION C1 5956617 @ISO2016 vided by IHS under No reproduction or networking permitted without license from IHS IS0 7240-24:2016(E) COPYRIGHT PROTECTEDDOCUMENT 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 Licensee-ZHEJIANG INST OF STANDARDIZAISQ 0d6 - All rights reserved HS und Not for Resale, 2016/7/20 02:56:16 networking permited without license from IHS IS0 7240-24:2016(E) Contents Page Foreword ..V Introduction.. ..vii 1 Scope. 2 Normative references 3 Terms, definitions, symbols and abbreviated terms ..2 3.1 Terms and definitions ..2 3.2 Abbreviated terms... Requirements. 4 4.1 Compliance. .4 4.2 Frequency response limits. 4.3 Durability 5 4.4 Construction 4.4.1 Provision forexternal conductors .5 4.4.2 Materials ..6 4.4.3 Ingress protection. .6 4.4.4 Access .6 5 Tests. .6 5.1 General .6 5.1.1 Atmospheric conditions for tests .6. 5.1.2 Operating conditions for tests.. 5.1.3 Mounting arrangements. .7 5.1.4 Tolerances. 5.1.5 Frequency response measurement and sensitivity calculation 7 5.1.6 Frequency response measurement and sensitivity calculation for loudspeakers requiring dedicated system equalization. ..8 5.1.7 Provision for tests. ..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 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 of the test .11 5.4.2 Test procedure .11 5.4.3 Reguirements .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 Requirements ..14 5.8 Dry heat (endurance) ..14 ntemaional ganzation6All rights reserved ii icensee=ZHEJIANG INST OF STANDARDIZATION C1 5956617 ed without license from IHS