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fire alarm system

  1. Electrical
    I read that new fire alarm units use a 3-wire hookup, is that true generally? Would that be something like pos+neg+signal? I ask because we have an old alarm system in our house. It was built in ~1976. I know of at least one fire detector that is hard-wired into the alarm system, but if I...
  2. General DIY Discussions
    Hello and Merry Christmas to all of you! I am not sure where this goes, but will start here. My church is struggling to get our preschool at a point where it will pass inspection. Just when we think we have done everything the inspector wants, he comes around and gives us a brand new list...
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