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Twin Wire Zone on Addressable Zone Monitor - HELP

Guest Luke

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Guest Luke


I will be carrying out a fire alarm upgrade at the end of the month. The site currently has a 4 loop Kentec panel with Apollo XP95 protocol and then several out buildings on conventional TWIN WIRE zones that I would like to move onto the addressable panel via zone monitors.

The conventional zones currently have detection and bells on the same circuit. Is there anyway, using a combination of zone monitors, sounder controllers & cause & effect to put the twin wire circuit onto the addressable zone monitor? It would not be cost effective to run new bell circuit cabling back to each out building.

A colleague several years ago seemed to have figured out a solution but has since left the business. Bit stuck at the moment!

Any help would be appreciated



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You need to ask this on firealarmengineers.com/forum

Because of how a twin wire or sav wire system works (voltage drop or polarity reversal depending on type) traditional zone monitors and sounder driver units generally wouldn't work.

Interfacing the panels (presumably the current set up) or making the twin wire zones addressable spurs by putting new devices on and using isolators at the relevant points are what you often see.

You would have thought someone would make suitable off the shelf products for monitoring twin wire zones.

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