Understanding Fire Alarm

[telectrix]

2 wire have the detectors and sounders wired all on same radial/s. the sounders are connected reverse polarity so in a non-alarm state they don'tsound. when the panel goes into alarm, it switches the polarity over so the sounders then activate. this works because detectors are not polarity sensitive.

 

[Darkwood]

@Alan Marriott

Can you please answer the question you were asked before we continue with this thread, the numerous questions here about different systems and the way they are asked is becoming suspect, what is the interest here, is this for homework, an assignment etc or are you trying to repair, install or add to an existing fire alarm system?
Apologies for the interrogation here but we cannot advise further until we know why you are asking for such advice.

 

[Alan Marriott]

Sure no problems. I work for an electrical contractor and been qualified 2 years now. I come across different systems installed by sub contractors and am always curious to know and learn as sometimes we have to break into circuits to add devices and thought it’d be beneficial to learn and understand how these systems work for my own knowledge. Currently I’m ripping out an old conventional system as a new addressable one has been installed.
I appreciate the help and info as cleared some things up I couldn’t get my head around.

Thanks again everyone who has commented

 

[Darkwood]

Excellent, apologies again, we have to ensure you are not using the forum to effectively answer homework or assignment questions, carry on