NATIONAL FOREWORD

This Indian Standard (Part 3) which is identical with ISO 7240-3 : 2010 ‘Fire detection and alarm systems — Part 3: Audible alarm devices’ issued by the International Organization for Standardization (ISO) was adopted by the Bureau of Indian Standards on the recommendation of the Fire Fighting Sectional Committee and approval of the Civil Engineering Division Council.

This standard is published in various parts. Other parts in this series are:

Part 2 Control and indicating equipment

Part 4 Power supply equipment

Part 5 Point-type heat detectors

Part 6 Carbon monoxide fire detectors using electro-chemical cells

Part 7 Point-type smoke detectors using scattered light, transmitted light or ionization

Part 11 Manual call points

Part 12 Line type smoke detectors using a transmitted optical beam

Part 15 Point type fire detectors using scattered light, transmitted light or ionization sensors in combination with a heat sensor1)

Part 16 Sound system control and indicating equipment

Part 17 Short-circuit isolators

Part 20 Aspirating smoke detectors

Part 22 Smoke-detection equipment for ducts

Part 23 Visual alarm devices

In a fire detection and alarm system, the purpose of the audible alarm devices is to warn person(s) within, or in the vicinity of, a building of the occurrence of a fire emergency situation in order to enable such a person(s) to take appropriate measures.