New PDF release: 100 Ways to disappear and live free

By Barry Reid

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Typically, for a 24 V battery, this current will average between 30 A and 150 A. It is therefore very important that the cable conductor sizes are large enough to minimize temperature rise and voltage drop. c. power input terminal of the voice alarm system. 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.

5 for earth continuity. 24 Work on site The work on site should consist of the following: a) siting and accommodation of control equipment, power supplies, microphones, amplifiers and loudspeakers; b) installation of cables, including the provision of cable-ways; c) installation of equipment; d) inspection, initial testing, commissioning and certification. 2 Cable and wiring The installation of cable and wiring should be undertaken in accordance with BS 7671 : 1992. 4 of BS 5839 : Part 1 : 1988 should also be followed.

NOTE. The subject of intelligibility of these devices is still under study. Because of the wide range of frequencies in a spoken message and varying attenuation of these frequencies, it is unlikely that adequate coverage can be obtained with the same number of voice sounders as of fire alarm sounders. This is particularly important when trying to upgrade a system to use voice sounders. 4 Monitoring Most voice sounders are connected to standard fire detection and alarm control equipment which uses end of line resistors for monitoring the integrity of the alarm circuits.

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