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Bosch Voice Evacuation Systems | 3
Category Product
Expansion
Modules
EVX‑25 25 W Amplifier with DMR and microphone
EVX‑25E 25 W Amplifier without DMR, with microphone
EVX‑25EM 25 W Amplifier without DMR and microphone
EVX‑50 50 W Amplifier with DMR and microphone
EVX‑50E 50 W Amplifier without DMR, with microphone
EVX‑50EM 50 W Amplifier without DMR and microphone
EVX‑100 100 W Amplifier with DMR and microphone
EVX‑100E 100 W Amplifier without DMR, with microphone
EVX‑100EM 100 W Amplifier without DMR and microphone
Remote
Microphones
EVX‑RM Charcoal‑gray Remote Microphone Panel
EVX‑RMR Red Remote Microphone Panel
Zone
Splitters
EVX‑2ZA Class A Zone Splitter
EVX‑4Z Class B Zone Splitter
Speaker Placement
Choose speakers that deliver a minimum ambient sound of
15 dB above the normal ambient noise level. In
high‑ambient noise areas, speakers should be tapped at
15 dB to 21 dB above the ambient noise level and placed
closer to one another to ensure that voice messages are
intelligible.
The best way to determine speaker placement needs is to
conduct a site survey with a decibel meter to measure
ambient noise levels; however, some general rules for
speaker placement are:
•
Locate speakers at all pull stations and in main
corridors similar to the layout of conventional fire
horns.
•
Ensure that all occupied locations are within 50 ft
(15 m) of a speaker. Place additional speakers in rooms
such as cafeterias and computer rooms. Be sure there
are speakers in isolated areas where service personnel
might be working.
•
For ceiling‑mount speakers, use 2 W of speaker power
for every 2000 ft
2
(186 m
2
) of area covered in open
areas and 2 W for every 1500 ft
2
(139 m
2
) in divided
areas. For wall‑mount speakers, use 1 W of speaker
power for every 2000 ft
2
(186 m
2
) of area covered in
open areas and 1 W for every 1500 ft
2
(139 m
2
) in
divided areas.
Speaker Power Requirements
System power (total wattage) must be sufficient to supply
the power required by all of the speakers on the system.
Speaker transformers can often be tapped for different
wattages (usually, ¼ W, ½ W, 1 W, etc.). A system rated at
25 W of audio power can power a speaker load of 25 W. This
can be made up of 25 speakers each tapped at 1 W, 50
speakers each tapped at ½ W, or any mathematical
combination that is less than or equal to 25 W.
Speaker Wiring Requirements
The 25 V speaker circuits of most voice evacuation systems
are classified as power‑limited wiring and can be run with
other fire alarm wiring without ill effects. No special cabling
is required. Standard power‑limited fire alarm cable (FPL)
is sufficient for most applications; however, certain
addressable systems can generate extraneous noise from
their addressable loop. Because these addressable systems
cannot use shielded cable, shielding of the evacuation
speaker circuit helps to eliminate noise picked up and heard
in the speakers. When using 70 V circuits, separate them as
described in the National Electrical Code.
Generally, 18 AWG (1.0 mm) wire is adequate for speakers.
Heavier wire is needed if loads are high or the runs are long.
The following table indicates typical wire lengths for
specific wire sizes and speaker loads. It assumes that there
is an even distribution of speaker load and that a 20% drop
at the last device is allowable.
25 VRMS Output:
Power 18 AWG
(1.0 mm)
16 AWG
(1.3 mm)
14 AWG
(1.6 mm)
12 AWG
(2.0 mm)
10 W 1900 ft
(579 m)
3050 ft
(930 m)
4850 ft
(1478 m)
7700 ft
(2347 m)
15 W 1280 ft
(390 m)
2030 ft
(619 m)
3230 ft
(985 m)
5140 ft
(1567 m)
25 W 760 ft
(232 m)
1220 ft
(372 m)
1930 ft
(588 m)
3080 ft
(939 m)
70 VRMS Output:
Power 18 AWG
(1.0 mm)
16 AWG
(1.3 mm)
14 AWG
(1.6 mm)
12 AWG
(2.0 mm)
10 W 15200 ft
(4633 m)
24200 ft
(7376 m)
38360 ft
(11692 m)
61100 ft
(18623 m)
15 W 10130 ft
(3088 m)
16130 ft
(4916 m)
25570 ft
(7794 m)
40730 ft
(12415 m)
25 W 6080 ft
(1853 m)
9680 ft
(2950 m)
15340 ft
(4676 m)
24440 ft
(7449 m)
System Power Requirements
All Bosch voice evacuation systems require 120 VAC
connected to the system's power transformer. Standby
power is supplied, in case of AC power failure, by standby
batteries (not supplied). The EVAX25, EVAX50, and
EVAX100 require two 12 VDC, 7 Ah standby batteries. The
EVAX150 and EVAX200 require four 12 VDC, 7 Ah standby
batteries.
Technical Specifications
Environmental Considerations
Relative Humidity: Up to 95%, non condensing
Temperature (Operating): +32°F to +120°F (0°C to +49°C)
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