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NFPA requirements on the installation of alarm devices for water systems

Question asked by sithichai on Dec 5, 2018
Latest reply on Dec 6, 2018 by nocivus

What is NFPA requirements on the installation of the following alarm devices for water systems such as sprinkler and deluge systems:

1. motor alarm gong 

2. fire alarm bell/horn-strobe

3. flow switch downstream of alarm check valve/deluge valve

 

NFPA 15 Section 6.4.1.1 states that: 

6.4.1.1 All automatic water spray systems shall be provided with a local alarm.

 

Is it correct to understand that water motor alarm gong is required downstream of the alarm check valve or deluge valve? 

 

NPFA 15 Section 6.4.1.3 states that: 

6.4.1.3 Where a separate detection system is used to activate the water spray system, the alarm shall be actuated independently of system water flow to indicate operation of the detection system.

 

 

Does this mean that detection equipment be they heat detectors or pilot sprinklers should 1) send a signal to the fire alarm control panel to show "alarm" status or 2) the detection equipment should trigger the operation of local alarm devices such as alarm bell/horn strobe, or both 1) and 2)? 

 

NFPA 15 Section 6.4.1.6 states that: 

6.4.1.6 Water spray system water flow alarm systems that are not a part of a required protective signaling system shall not be required to be supervised, but shall be installed in accordance with Article 760 of NFPA 70, National Electrical Code.

 

Does this imply that installation of flow switch downstream of the alarm check valve or deluge valve is not mandatory? 

 

 

 

Thank you! 

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