PAS 41:2003 pdf download Directional Sounders — Requirements and tests
1 Scope
This Publicly Available Specification specifies performance requirements and methods of test fordirectional sounders intended to aid the evacuation of a building, ship or structure under emergencyconditions and/or where normal visibility is impaired.
NOTE 1 Normal visibility can be impaired by the nature of the environment or the people within that environment.NOTE 2 The purpose of a directional sounder is to identify waypoints on an escape route. A directional sounder or directionalsounder system should be regarded as a means of increasing the likelihood ol people locating and using their nearest escape route.which may have been overlooked.
This Publicly Available Specification adopts the classification of BS EN 54-3:2001 for two types ofapplication environments,and two classes of usage:
– type A.indoor use:
type B, outdoor use:
Class I,open space use;
– Class Il, corridor use.
This Publicly Available Specification is not intended to cover:
fire alarm sounders:
non-directional audible evacuation signals covered by the scope of ISO 8201:1987supervisory sounders, for example, within the control and indicating equipment.
2 Normative references
The following referenced documents are indispensable for the application of this document. For datedreferences, only the edition cited applies. Ior undated references. the latest edition of the referenceddocument (including any amendments) applies.
BS EN 54-3:2001, Fire detection and fire alarm systems – Part 3: Fire alarm devices – Sounders.
IEC 60651:1979,Specifications for sound level meters.
IEC 61260:1995.Octave and fractional octave band filters.
3 Terms and definitions
For the purposes of this Publicly Available Specification, the terms and definitions givenin BS EN 54-3:2001 and the following apply.
3.1
directional sounder
audible device which, as part of an emergency evacuation system in a building, ship, structure, premisesor location, guides a person, or persons, from an unsafe area to a safe area
3.2
type A device
audible directional sounder designed for indoor use
3.3
type B deviceaudible directional sounder designed for outdoor use
3.4
Class I device
audible directional sounder designed for open space use (subject to type A or type B)
3.5
Class II device
audible directional sounder designed for corridor use (subject to type A or type B)
8.6
directional sounder system
system comprised of one or more stand-alone or linked directional sounders for the purposes ofidentifyingan escape route under emergency situations
3.7
supervisory sounderaudible device, usually mounted within a piece of equipment (e.g. control and indicating equipment), usedfor drawing attention,locally, to a change in status or the presence of an abnormal condition indicated bythat equipmentBS EN 54-3:20011
3.8
sound pattern(s)temporal arrangement of the bursts or pulses of sound output from the device
4 Requirements
4.1 Conformity
In order to conform to this Publicly Available Specifcation, directional sounders shall meet therequirements of this clause which shall be verified by visualinspection or engineering assessment, shall betested in accordance with, and shall meet the requirements of Clause 5.
4.2 Sound level
The directional sounder shall conform to the requirements of BS EN 54-3:2001, 4.2
4.3 Sound patterns
The directional sounder shall conform to the requirements of BS EN 54-3:2001, 4.3 except that only thesound pattern(s) shall be declared.