【 Weak current College 】 public radio and emergency broadcast design requirements---Power By 【 China power house network 】

Public radio and emergency broadcast design requirements
I. public broadcasting's design requirements:
⑴ transmission mode: System output power feed delivered by cable way. ⑵ on line attenuation requirements: in the public broadcasting system, from the output of the amplifier unit to line up of speakers of the line between user attenuation should meet the following requirements: · business broadcasting should not exceed 2 DB (1kHz) · service broadcasting should not be greater than 1 DB (1kHz) ⑶ using fixed output voltage, output voltage feeder lines using 70V or 100V. ⑷ power amplifiers of capacity calculation: the business of broadcasting systems and operations of the broadcasting system of calculation method: P = K 1 × K 2 × Σ P o type: P--power amplifier output total power (W); Po--Ki×Pi, each tap at maximum power when broadcasting (W); Pi--I tap on user devices rated capacity; Ki--I tap while need coefficient; service broadcast, the rooms show each Ki of 0.2-0.4; Background music by 0.7 Ki-0.8 K1--line attenuation compensation coefficient: line attenuation while taking 1.26 1dB; line attenuation while taking 1.58 2dB; K2--aging factor, generally take 1.2-1.4; · fire broadcasting system of calculation method: the system of calculation method has the following two ways: a. power amplifier capacity on the system speaker 1.3 times. B. power amplifier capacity on the system of maximum 3 layer speaker 1.5 times. ⑸ power amplifier alternate public broadcasting system of the power amplifier should be set back up power amplifiers, power amplifiers in work power amplifier failure can automatically or manually put into use. For important radio power amplifier (such as fire radio power amplifier), its standby power amplifier should be can't work amplifier failure automatically put to use immediately. The number of standby power amplifier should be important to determine the load capacity of broadcasting. ⑹ Speaker settings · in offices, living rooms, changing rooms, and other Office settings 3W speakers · floor corridor. General use of ceiling-mount speakers, speaker of the spacing by storey (ceiling height) 2.5 times. Choose 3-5W ceiling speakers. · Hall, conference room, restaurant, retail shopping centers, entertainment venues and other places to put 3-6W speaker box · room bedside control., Cabinet 1W-2W speakers in building decoration ·., and the room height allows for large space of the use of sound column or combination of speakers., high noise · humid place setting speaker, Horn speakers should be used. In places where noise high the Horn speaker sound pressure level than the environment 10-15dB noise. ⑺ broadcasting system power requirements · smaller capacity radio can supply power directly from the socket; capacity above the 500W, sets the broadcast control room, its power can be used by the nearest power controller-dedicated AC voltage power supply. · generally should not be greater than the offset value + 10%, when the voltage offset does not meet the requirements of the device limitations, you should install the equipment near. automatic voltage regulator unit · broadcast AC power supply capacity is generally final broadcasting equipment AC power consumption capacity 1.5-2 x. fire broadcasting equipment · adopts fire power. ⑻ transmission cable choice · room service of broadcasting channels use copper conductor multi-core cables or copper conductor stranded wire plastic. · other broadcasting channels use copper conductor stranded wire plastic. various signal line · should · shielded cable broadcasting channels should fire retardant copper-core cables used or fire resistance of copper wire and cable. ⑼ line laying · line adopts wear steel pipe or cable laying, and lighting, power line with trunking installation. · fire broadcasting line fire protection measures should be taken. Second, emergency broadcast design requirements: the ⑴ fire radio speaker settings should meet the following requirements: · emergency broadcast speaker settings in the corridors, halls, restaurants and other public places, the number should be able to guarantee any part from the floor to the most recent one speaker in walking distance of no more than 25 meters. The intersection in the aisle, the corner should set speakers. Sidewalk ends last cry out from the wall is not more than 12 metres. Each speaker rated power should not be less than 3W. · in-room speakers power should not be less than 1W. · in-room air conditioning, ventilation equipment room, a laundry, a civic space and parking, and other background noise at the speaker, in its broadcast range of playback sound pressure level should be higher than background noise identification 15dB, speaker of power. ⑵ fire broadcasting should not be greater than 100V voltage feeder. Each floor of the feeder isolation voltage regulator to ensure that when any of the tap has a fault, should not affect other tap of a normal radio. ⑶ fire broadcasting output branch should be evacuated sequence control, playback evacuation instructions floor control procedures are as follows: · n-tier and n-tier or above the floors of a fire, you should connect the fire floor is adjacent to and downlevel. first floor fire ·, should first be connected to this layer, layer 2 and underground floors. · fire in the basement, connected underground floors and first floor. ⑷ fire broadcasting and service broadcasting or operational radio combination, should meet the following requirements: · fires should be able to fire control room will fire evacuation floor speakers and amplifier forced to fire the broadcasting State. · fire control rooms should be able to monitor fire radio power amplifier for operation within · room bedside Cabinet. ' set the speaker, shall have the fire broadcasting features. fire · if broadcasting and service broadcasting or operational radio in combination with the speakers volume switch, the system should be used in third-line wiring cables forced open the fire so broadcasts.