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  1. Autofire

    FM vs UL for Class 1 Div 1

    We have a horn loudspeaker that is FM approved for Class 1 Div 1. Unfortunately many of the clients we try to sell this to say they need to see a UL mark on there. As far as I understand FMs standard FMRC-3615 and ULs standard 1203 fulfill NFPA 70, Article 500 where the criteria for Class &...

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