Wow I thought a speaker strobe always require (2) pairGet 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.
Fire alarm annunciating and initiating devices can use THHN?
THanks. I thought ALL fa devices had to use fire alarm wire...such as 150 or 200 degree unshielded or shielded.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.
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.THanks. I thought ALL fa devices had to use fire alarm wire...such as 150 or 200 degree unshielded or shielded.