Fire Alarms & Relays

Discussion in 'The Projects Forum' started by kevinhannan, Oct 6, 2009.

  1. kevinhannan

    Thread Starter New Member

    Oct 5, 2009
    7
    0
    I am severely deaf and I want to wire my fire alarm to a mains relay to switch off the mains when the fire alarm is tripped.

    You see, I have a vibrating motor device that alerts me when the electric is tripped, and so when the fire alarm is tripped, it switches off the mains extension lead which triggers my alarm.

    I know it sounds a bit complicated, and there are probably simpler ways but I just want to see this particular problem through.

    I'm guessing that when the alarm is tripped there will be a voltage at the piezo buzzer which can then turn a mains relay off. The extension lead is connected to/controlled by the relay.

    I have two problems:

    I don't know how to wire a relay having never had one. Can someone point the way for me please?

    When the alarm stops (because the battery is dead) I want the mains to stay off.

    When the alarm is reset (working again) the mains must come on again.

    I think once I have got my first project out of the way I will have the confidence to try other projects by myself. It's just that I need my hand holding for this first one. Silly I know, but that's me!

    Thanks for looking in. I appreciate it very much.

    Kevin
     
  2. gerty

    AAC Fanatic!

    Aug 30, 2007
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  3. RiJoRI

    Well-Known Member

    Aug 15, 2007
    536
    26
    Kevin --
    I would consider using at least one strobe light in your sleeping area. That gentle vibration may not be enough to wake you up. They are commercially available -- we have them here where I work at an alarm company: with all the different alarms being tested, we have come to ignore the sounds.

    --Rich
     
  4. kevinhannan

    Thread Starter New Member

    Oct 5, 2009
    7
    0
    Thanks, Gerty and RiJoRI,

    thank you both for your kind replies:

    I'll look into the shunt trip; it sounds ideal, although what difference it is to a latching 240v relay I'm not quite sure (ie why you would choose one over the other)

    I have a phenomenally mental vibrating pad under my mattress, thanks; powerful enough to create a tsumani somewhere!

    (Funnily enough, having come home today, the pad and alarm had tripped for the first time, bit no smoke or fire - I'm guessing the leccy must have spiked)

    Thnaks again guys! Especvially for your time.
     
  5. RiJoRI

    Well-Known Member

    Aug 15, 2007
    536
    26
    "(Funnily enough, having come home today, the pad and alarm had tripped for the first time, bit no smoke or fire - I'm guessing the leccy must have spiked)"

    The alarm industry spends a LOT of time and money on False Alarm Reduction. Many townships will fine the homeowners for false alarms on a rising scale. We're talking something like $500, $1000, $5000, etc.

    --Rich
     
  6. kevinhannan

    Thread Starter New Member

    Oct 5, 2009
    7
    0
    In England, we just have hard stares and filthy looks!

    That hurts....
     
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