Some questions regarding duct detector remote test stations, reset switch, and NFPA requirements..

[bsannich]

As the title says, I have some questions about the fire alarm side of duct smoke detectors. I could really use some clarifications on a couple things, so if anyone is able to help, I would really appreciate it.

First, in practice, is there a difference between a "remote test station" and a "reset switch"? I know that there is a difference - but are these devices typically combined into a single device? When will/won't they be combined?

Regarding the operation:

My understanding is that a remote test station is used to test a duct smoke detector without a) smoking it or b) using, say, a magnet on it. You're not testing the operation of the duct detector, but you are testing the response of the fire alarm system to a simulated duct detector activation. Do you agree with that?

My understanding is that a reset switch is used to reset (or "clear") a duct a detector after it has been activated.

Where are these required? My interpretation of NFPA 72-23.8.5.4.6.4 is that a reset switch is required when the duct detector is not resettable from the FACP. Is it sometimes the case that a duct detector is NOT resettable from the FACP? Under what circumstances will this be the case?

And, finally, when is a remote test station required? I usually only see them when a duct detector is above a ceiling, but I don't see them 100% of the time. I'm wondering when they are required by code.

Thanks for any help you can give me.

 

[steve66]

All good questions, but I'm as confused as you are. I've typically been specifying them for detectors that are hard to get to, like if its installed in a rooftop unit, or somewhere where an 8' ladder wouldn't reach.

But now you have me wondering - since all the fire alarm panels are usually addressable now (at least that's what I usually spec), why can't they do all that from the FACP.