I'm looking for pro's and con's on installing wireless fire alarm systems in moderate to large buildings ?
Wireless fire alarm system detector shall be limited to 12 nos.
I do not believe this to be true. Code reference please?
What does 12 nos mean?
I'm not sure that I understand the answer, (12 nos). I just attended a Fire Lite training class and they had a section on their new wireless system SWIFT. There are a lot of unique features incorporated to ensure connectivity and to alert one to any troubles. Remodel projects, Historic buildings, Areas that are difficult to get wire to. I would think that AHJ's would object to a complete wireless building. Lifetime on batteries is 2 years with the fire lite brand, battery cost is about $9.00 per detector.
I would appreciate it if you let me know why 12 nos? What happens if the number of detectors go higher than 12?
I Agree that use wireless fire alarm on Remodel projects, Historic buildings, Areas that are difficult to get wire to.
For a permanent building, wireless fire alarm system is not a good choice. The wireless signal is very easy to be interfere with nearby wireless device.
When a fire break, there will be more than one device act and may be there are other wireless system act at the same time. The signal collision may happen, then the signal may not deliverable. Which might cause system failure.
Bill, The CWSI wireless system is not limited to 12 detectors. It has the capability of 1024 detectors on a system and soon to be 2048. It incorporates wireless repeaters with NAC circuits to handle audio/visual requirements in the protected area. Wireless smoke detectors, tandem smoke detectors with sounders, heat detectors, monitor modules, pull stations, wireless relay modules, CO detectors, wireless mini horns, and 520 Hz sounders are all part of the system. We have installed multiple full wireless detection systems in the Chicago Metropolitan area and have received approval from all AHJ's involved. The equipment is UL Listed, FM approved, CSFM approved, and City of New York approved.
In my opinion, wireless fire alarm system are no longer a future technology. It is a viable alternative to hard wired systems.
What does 12 nos. mean?
Mr. Wu, with all do respect, do you have any experience in installing wireless fire alarm systems? Your comment on multiple signal interaction when a fire is detected is not the case. The CWSI wireless system is a fully addressable, fully supervised system that would report each activation separately. Just because multiple detectors were activated in the same building does not mean they will interfere with each other's signal transmissions. These systems have been installed in thousands of locations across the United States and have never had interference because of multiple activations.
In RI, we have allowed low-power radio (wireless) systems for many years in any occupancy where a fire alarm system is required, both residential and commercial. To date, no problems or issues, IF installed and maintained correctly.
I semi-agree. Maintenance is KEY. By all means. Set and forget just does not work. The very best units warn of a low battery condition. All unit should transmit their condition on a minute-by-minute basis.
I believe the respondent was referring to single - multiple station smoke alarm tandem interconnect limitations for hardwired household fire alarm systems where the interconnecting means is not supervised, so the response for the No.s of detectors is a non sequitur
I'm not a big proponent of wireless emergency systems.
1. Battery failures.
2. Lithium batteries can explode in a fire also.
3. So many devices are going wireless, and more will be on the way in the future. (Interference problems)
Think good solid wire if possible.
How about the wireless communication devices that dispatch uses to communicate with the firemen? Like it or not, we've been using wireless for years and it is here to stay.
I’m a radio operator KB5YGJ. Look me up. I know what you are saying, but using a battery daily and charging daily, and replacing when defective; is different.
Maintenance of batteries is very poor when placed and forgotten.
I hope you know what I mean.
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