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Voice alarm loudspeakers are specially designed to be used in buildings with many strict requirements for the performance of voice evacuation broadcast systems. L30bc 86/41 is designed for voice alarm system. Basic function LBC 3086/41 loudspeaker device is a 6 W, double tone speaker with a built-in circular metal waveguide mask. A 100 V matching transformer is installed on the back. The delicate shape and natural RAL white coating allow speakers to blend perfectly into any indoor environment. 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. Safety emergency in accordance with BS EN 60065 standard * 5839 * EN 54 ? ? eight / 24 / EN 60849 standard * waterproof and dustproof in accordance with EN 60529 ? IP32 standard annotations * only 3081/02 flameproof enclosure with LBC combined with regional certification European CE CE CPD Poland CNBOP installation/configuration speaker can quickly and easily installed on the ceiling mounting holes. A separate installation ring with three built-in spring locking clips (for ceilings and wall panels of 9 to 25 mm thickness) can quickly hold the speaker in place. These lock clips are attached with protective rubber to prevent damage to the soft ceiling material. The circular form attached to the loudspeaker is used to mark the mounting hole with a diameter of 196 mm (7.7 inches). The speaker device is fixed to the mounting ring by a bayonet joint. The junction box loudspeaker is equipped with a three-way terminal box with screw connector, suitable for loop wiring. Matching the four primary coil connectors on the transformer allows the user to select the rated full power, half power, quarter power, or eighth power (increment 3 dB). The l30bc 81/02 fireproof cover assembly in the event of a fire, flames may spread throughout the building through speaker holes in the ceiling. To prevent the flame from penetrating the mounting hole through the loudspeaker, the skyflower loudspeaker can be equipped with a steel fireproof cover (LBC 3081/02).