Category | Product |
Expansion | EVX‑25 25 W Amplifier with DMR and microphone |
Modules |
|
| 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 | EVX‑RM Charcoal‑gray Remote Microphone Panel |
Microphones |
|
| EVX‑RMR Red Remote Microphone Panel |
Zone | EVX‑2ZA Class A Zone Splitter |
Splitters |
|
| 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 ft2 (186 m2) of area covered in open areas and 2 W for every 1500 ft2 (139 m2) in divided areas. For wall‑mount speakers, use 1 W of speaker power for every 2000 ft2 (186 m2) of area covered in open areas and 1 W for every 1500 ft2 (139 m2) 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.
Bosch Voice Evacuation Systems 3
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 | 16 AWG | 14 AWG | 12 AWG |
| (1.0 mm) | (1.3 mm) | (1.6 mm) | (2.0 mm) |
10 W | 1900 ft | 3050 ft | 4850 ft | 7700 ft |
| (579 m) | (930 m) | (1478 m) | (2347 m) |
15 W | 1280 ft | 2030 ft | 3230 ft | 5140 ft |
| (390 m) | (619 m) | (985 m) | (1567 m) |
25 W | 760 ft | 1220 ft | 1930 ft | 3080 ft |
| (232 m) | (372 m) | (588 m) | (939 m) |
70 VRMS Output: |
|
|
| |
Power | 18 AWG | 16 AWG | 14 AWG | 12 AWG |
| (1.0 mm) | (1.3 mm) | (1.6 mm) | (2.0 mm) |
10 W | 15200 ft | 24200 ft | 38360 ft | 61100 ft |
| (4633 m) | (7376 m) | (11692 m) | (18623 m) |
15 W | 10130 ft | 16130 ft | 25570 ft | 40730 ft |
| (3088 m) | (4916 m) | (7794 m) | (12415 m) |
25 W | 6080 ft | 9680 ft | 15340 ft | 24440 ft |
| (1853 m) | (2950 m) | (4676 m) | (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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