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Fire Alarm Cut Off
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<blockquote data-quote="John Moore" data-source="post: 93146" data-attributes="member: 610"><p>Re: Fire Alarm Cut Off</p><p></p><p>In the US here in Cali, we would design and use Listed 24V relays, that would either open the line level circuits or short them. Find out if they can give you an alarm dry contact out of the FACP and use what is called a PAM-1 relay, available via most fire mfr. including Siemens and all the major players. This dry contact would then be circuited thru a listed 24VDC power supply and cause the PAM-1 relays to close on alarm shunting or opening the line level circuits. Notifier, Simplex, Honeywell and Siemens all have something similar in their product line up that will accomplish what you are wanting to do...you can also use those to trip a larger contactor if needed to shut down larger loads, however following the Codes we always use a listed relay assembly as the initial interface to the fire alarm system and adjunct contactors, relays, etc. for things down stream. If the local authority wants that circuit "supervised" there is a bit more interface needed to the fire alarm system and a relay with an end of line resistor need so that if power failed the fire alarm system would send out a supervisory signal to alert staff that , that particular function, auxiliary action has failed.</p></blockquote><p></p>
[QUOTE="John Moore, post: 93146, member: 610"] Re: Fire Alarm Cut Off In the US here in Cali, we would design and use Listed 24V relays, that would either open the line level circuits or short them. Find out if they can give you an alarm dry contact out of the FACP and use what is called a PAM-1 relay, available via most fire mfr. including Siemens and all the major players. This dry contact would then be circuited thru a listed 24VDC power supply and cause the PAM-1 relays to close on alarm shunting or opening the line level circuits. Notifier, Simplex, Honeywell and Siemens all have something similar in their product line up that will accomplish what you are wanting to do...you can also use those to trip a larger contactor if needed to shut down larger loads, however following the Codes we always use a listed relay assembly as the initial interface to the fire alarm system and adjunct contactors, relays, etc. for things down stream. If the local authority wants that circuit "supervised" there is a bit more interface needed to the fire alarm system and a relay with an end of line resistor need so that if power failed the fire alarm system would send out a supervisory signal to alert staff that , that particular function, auxiliary action has failed. [/QUOTE]
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