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Thread: Fire alarm wiring class type

  1. #1
    Join Date
    Jun 2007
    Posts
    655

    Smile Fire alarm wiring class type

    Are there any fire alarm men here??? I know I should read NFPA-72 more in details later, but I thought I should throw the questions here, some of you may give me quick and short answers. Here they are:

    - What is the difference between below class of fire alarm wiring and their application?

    1. Class A, style D
    2. Class A, style Z
    3. Class B, style 4
    4. Class B, style Y

    - Do we have other fire alarm wiring class besides what listed above? Thanks!

  2. #2
    Join Date
    Feb 2003
    Location
    New York, 40.7514,-73.9925
    Posts
    3,346
    Class A, style D is an initiating Device Circuit (IDC)
    Class A, style Z is a Notification Appliance Circuit (NAC)
    Class B, style 4 is a Signaling Line Circuit (SLC)
    Class B, style Y is a Notification Appliance Circuit (NAC)

    Find many more in tables 6.5, 6.6.1 and 6.7 (reference numbers from the 2002 Ed)
    Ron

  3. #3
    Join Date
    Mar 2009
    Location
    Right now ??, previously VT
    Posts
    188
    OHH OHH MR CARTER MR CARTER I KNOW THIS.
    ok im gonna give this a shot

    dam late again, all I can add is Style 6=A and 7=A on your SLC
    Vermont Beer Tree, very rare

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