FIRE ALARM DEVICE WIRING

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horsegoer

Senior Member
Location
NJ
Is it pretty standard as to what devices get 1 pair wire and which get 2 pair wires for strobes, smokes, pull stations etc. I was told to use 2 pair dor spkr/strobes and single pair for all other. THanks,.
 

sameguy

Senior Member
Location
New York
Occupation
Master Elec./JW retired
Get with your fire alarm guy he will tell you what works with his system.
Could be just thhn or shielded twisted. Most things are 2 wires, (1p), in out; but it depends on what the FA is, ie. SLC 1pr., horn/spkr 1pr., strobe 1pr, aux pwr 1pr, again we can only tell you to ask the fire alarm guy.
 

horsegoer

Senior Member
Location
NJ
Get with your fire alarm guy he will tell you what works with his system.
Could be just thhn or shielded twisted. Most things are 2 wires, (1p), in out; but it depends on what the FA is, ie. SLC 1pr., horn/spkr 1pr., strobe 1pr, aux pwr 1pr, again we can only tell you to ask the fire alarm guy.
Wow I thought a speaker strobe always require (2) pair
 

Strathead

Senior Member
Fire alarm annunciating and initiating devices can use THHN?

In conduit! Or in fire alarm MC. I agree with sameguy. If you don't know the system and you don't have the device cut sheets you can not know. For example he generalizes that horn/strobes only need 2 wires, but while newer systems have electronics to silence the audible and keep the strobe flashing, prior to 2000 or so this function required a set of wires for the strobe and for the horns. Also, remember that this is two wires in and two separate wires out.
 

horsegoer

Senior Member
Location
NJ
In conduit! Or in fire alarm MC. I agree with sameguy. If you don't know the system and you don't have the device cut sheets you can not know. For example he generalizes that horn/strobes only need 2 wires, but while newer systems have electronics to silence the audible and keep the strobe flashing, prior to 2000 or so this function required a set of wires for the strobe and for the horns. Also, remember that this is two wires in and two separate wires out.
THanks. I thought ALL fa devices had to use fire alarm wire...such as 150 or 200 degree unshielded or shielded.
 

infinity

Moderator
Staff member
Location
New Jersey
Occupation
Journeyman Electrician
THanks. I thought ALL fa devices had to use fire alarm wire...such as 150 or 200 degree unshielded or shielded.
If you're in NYC that's probably what you would be using for a Class E fire alarm system. The single pair or two pair cables is a design issue. Some FA venders won't allow it others won't care. The savings in the fact that you only need to run one cable (2-pair) between speaker/strobes instead of two single pair.
 
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