BS 54-3:2001 pdf download – Fire detection and fire alarm systems — Part 3: Fire alarm devices — Sounders
b)supply frequency ranges, where relevant;
c)for all modes of operation, the minimum A-weighted sound level in dB at a distance of 1 m from the referencepoint of the device for the following directions of radiation:
1)surface mounted device: at 30° intervals from 15° to 165° through a semi-circular arc in front of thedevice and centered at the intersection of its normal mounting surface and its principal axis，for twoperpendicular planes corresponding to the horizontal and vertical planes of the device in its designed position(see annex A, Figure A2);
2)pole mounted device: at 30° intervals through a 360° circle centered at the intersection of the horizontalplane containing its principal axis and the vertical line through the geometrical centre of the sound diffusingassembly,for two perpendicular planes corresponding to the horizontal and vertical planes of the device in itsdesigned position (see annex A, Figure A3);
dmain sound frequency(ies), frequency range(s) and sound pattern(s);e)IP Code to EN 60529:1991;
f)any other information necessary to allow correct installation, operation and maintenance of the device.
5 Tests
5.1General
5.1.1 Atmospheric conditions for tests
Unless otherwise stated in a test procedure, the testing shall be carried out after the test specimen has been allowed tostabilize in the standard atmospheric conditions for testing described in EN 60068-1:1994, as follows:
a)temperature:
15 C to 35 °C;
b)relative humidity:25 % to 75 %;
c)air pressure:
86 kPa to 106 kPa.
The temperature and humidity shall be substantially constant for each test where these standard atmospheric conditionsare applied.
5.1.2Operating conditions for tests
lf a test method requires a specimen to be sounding,then the specimen shall be connected to suitable power supplyequipment as specified in the data provided by the manufacturer. Where, in order to be sounding, a device also requiresthe application of a control signal or signals, this shall be provided in accordance with the manufacturer’s specification.lf a test method requires a specimen to be in the quiescent state, then the specimen shall not be supplied with powerunless it is a sounder of the types which have electronic circuits for analyzing control signals and triggering the soundoperation, in which case the specimen shall be connected to suitable power supply and control equipment as specified inthe data provided by the manufacturer and the control signals shall be arranged so that the specimen is in anon-sounding state.
Unless otherwise specified in the test procedure, the supply parameters applied to the specimen shall be set within themanufacturer ‘s specified range(s) and shall remain constant throughout the tests. The value chosen for each parametershall be the nominal value, or the mean of the specified range.
lf the manufacturer has declared different sound levels for operation under different conditions (see 4.6.2), then,unlessotherwise specified by the test procedure, the tests shall be conducted under one selected mode of operation only.Selection of the mode of operation shall be made with the aim to use that which consumes the most power. This willnormally be the most continuous or the loudest mode.
NOTE All modes of operation and all voltage ranges are tested in 5.3.
5.1.3 Mounting arrangements Unless otherwise specified, the specimen shall be mounted by its normal means of attachment in accordance with the manufacturer’s instructions on a flat rigid backing board. If these instructions describe more than one method of mounting then the method considered to be most unfavourable shall be chosen for each test. The detailed mounting arrangements are given in annex A or annex B for the different sound level tests used.
5.1.4 Tolerances The tolerances for the environmental test parameters shall be given in the basic reference standards for the test (e.g. the relevant part of EN 60068). If a specific tolerance or deviation limit is not specified in a requirement or test procedure, then a deviation limit of ±5 % shall be applied.