Emergency broadcasting equipments shall be installed pursuant to the following provisions:
1.The volume measured at the position 1m away from the speaker shall comply with the table below:
┌────────┬────────┐
│Type of speaker │ Volume (V) │
├────────┼────────┤
│Grade L │ ≧92db │
├────────┼────────┤
│Grade M │ 87db≦V<92db │
├────────┼────────┤
│Grade S │ 84db≦V<87db │
└────────┴────────┘
2.Speaker shall be installed pursuant to the following provisions:
(1)Grade L speaker shall be used where the broadcasting area is larger than 100m2.
(2)Grade L or Grade M speaker shall be used where the broadcasting area is larger than 50m2 but smaller than 100m2.
(3)Grade L, Grade M or Grade S speaker may be used where the broadcasting area is smaller than 50m2.
(4)The horizontal distance from any point of the broadcasting area to the speaker shall be less than 10m. But it is allowable that no speaker is installed where the floor area of living room is less than 6m2 or the floor area of the main aisles and passages from the living room to the ground is less than 6m2, the floor area of the parts other than living room less than 30m2, and the horizontal distance form the speaker in this area to the speaker in the adjacent area less than 8m.
(5)When installed in stairways or ramped aisles, at least one Grade L speaker shall be installed for every 15m vertical distance.
The volume and equipments of speakers installed in places except stairwys and ramped aisles shall comply with the following provisions:
The volume of a place where is 1m away from the floor ground within the broadcasting areas shall be more than 75dB calculated depanding on the following formula:

P=p+10log10（Q/4πr2+4(1-α/Sα）

P: Volume (Unit: dB)
p: Audio Power of Speaker (Unit: dB)
Q: Directivity Factor of Speaker
r: Distance between Audio Point and Speaker (Unit: m)
α: Average Sound Absorbing Rate in Broadcasting Area
S: Total Area of Walls, Floorslabs and Ceilings within Broadcasting Area(Unit:m2)
(6)When the echoing sound is more than 3s, the distance between the place 1m to the floorslabs and the speaker shall be calculated depending on the following formula:

r=3/4√QSα/π（1-α）

r: Distance between Audio Point and Speaker (Unit: m)
Q: Directivity Factor of Speaker
S: Total Area of Walls, Floorslabs and Ceilings within Broadcasting Area(Unit:m2)
α: Average Sound Absorbing Rate in Broadcasting Area

• Article 133.pdf

Broadcasting divisions in buildings equipped with emergency broadcasting equipments shall be allocated pursuant to the following provisions:
1.Each division may not cover more than one floor.
2.As for indoor safety stair or emergency stair, one broadcasting division shall be independently set for every 45m of vertical distance, and another broadcasting division for the underground proportion of the indoor safety stair or emergency stair.
3.The overhead supporting construction of a building shall be treated as a broadcasting division where the volume of speaker meets the requirement.

Where emergency broadcasting equipments are interlocked with automatic fire alarm equipments, the ring pattern of the fire alarm shall comply with Article 113.
The audible alarm of the emergency broadcasting equipments shall be the voice type.
The emergency power of the emergency broadcasting equipments shall comply with Article 128.

Actuating device of emergency broadcasting equipments shall comply with CNS No.10522, and be installed pursuant to the following provisions:
1.The travel distance from any point of each floor to the actuating device shall be less than 50m.
2.Actuating device shall be installed within 0.8m~1.5m above the floor.
3.Emergency telephone starting shall be used for storeys above the 11th floor, or under the 3rd floor or underground storeys.

Where used together with other equipments, the emergency broadcasting equipments shall be enabled to shield the broadcastings from others.

Audio amplifier and operating device shall comply with CNS No.10522, and installed pursuant to the following provisions:
1.Operating device shall be interlocked with actuating device or automatic fire alarm equipment, and marked with the storeys or the area covered by the operating of the actuating device or automatic fire alarm equipment.
2.Functions of selecting necessary storeys or areas shall be provided.
3.Signals indicating short circuit shall be provided where the wiring of a broadcasting division is in short.
4.The operating switch of operating device shall be 0.6~1.5m above the floor (0.6~1.5m for seat type).
5.Operating device shall be located in watchroom or other usually populated places. Where a disaster prevention center is set up, the switchboard shall be located in the center.

Emergency broadcasting equipments shall be wired pursuant to Regulations for Installation of User's Electricity Device and the following provisions:
1.A 250V DC insulation ohmmeter shall be used to measure the insulation resistance between the wire and the earth. Where the voltage to earth is not more than 150V, the resistance shall be not less than 0.1MΩ; where the voltage to earth exceeds 150V, the resistance shall be not less than 0.2MΩ.
2.The wire conduit may not be shared by other wires, unless the electric wire inside the conduit is used for light current with a voltage less than 60V.
3.Short or disconnection of the circuit for the speaker in any storey will never affect the broadcasting of other storeys.
4.Three-wire wiring shall be used where volume adjuster is equipped.