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Voice alarm loudspeakers are specially designed to be used in buildings with many stringent requirements for the performance of voice evacuation broadcast systems. The l30bc 87/41 loudspeaker is designed for voice alarm system and conforms to British BS 5839-8 standard. Basic function LBC 3087/41 is a kind of economical and practical embedded smallpox speaker, suitable for general application. It is a widely used loudspeaker for transmitting voice and music in stores, warehouses, schools, offices, gyms, hotels and restaurants. The l30bc 87/41 is equipped with a 6 W speaker with a double speaker. A 100 V matching transformer is installed on the back. The front is fitted with a round metal mask and is beautifully coated with a RAL 9010. The speaker has built-in protection. In case of a fire, this protection ensures that the damage to the loudspeaker does not result in the failure of the circuit connected to it. In this way, the integrity of the system is maintained to ensure that the loudspeakers in other locations can still communicate to people in a timely manner. The loudspeaker is equipped with a ceramic junction box, a temperature fuse and a heat-resistant high-temperature conductor. In addition, it can be equipped with optional fireproof cover to enhance the protection of cable terminals. All Bosch speakers are certified to meet IEC 268-5 power handling capacity (PHC) standards and can operate continuously for 100 hours at rated power. Bosch has also conducted simulated acoustic feedback exposure tests to ensure they can withstand twice the rated power in a short period of time. This ensures high reliability of the speaker under extreme conditions, improves customer satisfaction, extends service life, and significantly reduces the probability of failure or performance degradation. Security in accordance with EN 60065 standard emergency conform to BS 5839 8 / EN 60849 / EN 54 ? ? 24 standard * anti-collision conform to DIN VDE 0710 part 13 * waterproof and dustproof in accordance with EN 60529 ? IP32 standard annotations * only 3080/01 flameproof enclosure with LBC combined with regional certification European CE CE DOP CPD Poland CNBOP CNBOP installation/configuration The speaker assembly can be quickly and easily installed into the mounting hole in the ceiling and fixed with three white screws. The circular template attached to the speaker is used to mark the mounting hole with a diameter of 165 mm (6.5 in). Terminal junction box loudspeaker equipped with three - way terminal junction box with screw joint, suitable for loop wiring. Matching the four jumper connections on the transformer allows the user to select the rated full power rate, half power, quarter power, or eighth power (increment 3 dB). In the event of a fire, the hole in the ceiling where the speaker is mounted causes the flame to spread throughout the building. To prevent the flame from entering the hole through the loudspeaker, the ceiling loudspeaker can be fitted with a steel flameproof cover (LBC 3080/01). This optional part of the flameproof cover can be installed on the speaker assembly using the standard four self tapping screws. There are four holes in the fire protection cover: two (2) for rubber sealing plug (attached) and two (2) for cable sealing plug (PG13).