Section 2 Public address system levels
Clasification Society 2024 - Version 9.40
Clasifications Register Guidance Information - Ship Vibration and Noise Guidance Notes - Chapter 9 Audible alarms and public address systems - Section 2 Public address system levels

Section 2 Public address system levels

2.1 The minimum sound pressure levels produced by speakers for broadcasting emergency announcements with the ship underway in moderate weather shall be:

  • 75 dBA and at least 20 dB above the speech interference level in interior spaces
  • 80 dBA and at least 15 dB above the speech interference level on open decks.

2.2 The minimum sound pressure levels due to the emergency alarm tone in interior spaces and on open deck with the ship underway in moderate weather should be 80 dBA and at least 10 dBA above ambient noise levels. At bunks and in bathrooms the levels should be the same as required for audible alarms in Ch 9, 1 Audible alarm levels 1.1 .

Parent topic: Chapter 9 Audible alarms and public address systems
Copyright 2022 Clasifications Register Group Limited, International Maritime Organization, International Labour Organization or Maritime and Coastguard Agency. All rights reserved. Clasifications Register Group Limited, its affiliates and subsidiaries and their respective officers, employees or agents are, individually and collectively, referred to in this clause as 'Clasifications Register'. Clasifications Register assumes no responsibility and shall not be liable to any person for any loss, damage or expense caused by reliance on the information or advice in this document or howsoever provided, unless that person has signed a contract with the relevant Clasifications Register entity for the provision of this information or advice and in that case any responsibility or liability is exclusively on the terms and conditions set out in that contract.