FAS in Hazardous Location

New research Lab with H2 and H3 Hazardous Rooms occupancies , it is electrically classified per NFPA 70, Article 500, the question is about the fire alarm devices in these rooms, do the FA devices required to be  electrically classified or not? the designer is claiming that these devices are of low voltage and not creating a hazard , therefore it is not required to be of classified . Your insights are highly appreciated.

JABER AL-HAJI

hajijm@yahoo.com

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