By British Standards Institute
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Extra resources for Fire Detection and Alarms BS 5839
Detailed guidelines on sound levels that should be produced by the fire detection and alarm system are given in HTM 82 . 5) is complicated because a typical emergency message is a composite of periods of silence, attention-drawing signals and voice. The periods of silence, however, should be considered as extensions to the `voice' element; this is a safeguard to allow, for example, for the use of a fire microphone to override the emergency message. A method of calculating I2 approximately is given below.
Tel: 020 8996 9001. Fax: 020 8996 7001. In response to orders for international standards, it is BSI policy to supply the BSI implementation of those that have been published as British Standards, unless otherwise requested. Information on standards BSI provides a wide range of information on national, European and international standards through its Library and its Technical Help to Exporters Service. Various BSI electronic information services are also available which give details on all its products and services.
C. e. 2 V for a 24 V battery. As an example, in an ambient temperature of 30 8C, each core of a copper cable pair of length 2 m would need to have a cross-sectional area of at least 25 mm2 for a 100 A supply current. ) If, however, the cable length were 15 m, a 70 mm2 conductor size would be needed for the same supply current. 2), the cables connecting to the voice alarm control equipment need not be fire-resisting since neither the control equipment nor the batteries will withstand very high local temperatures.