Question:   I would like to ask what is the reason or purpose of listing fire alarm systems and components. I don't need the procedure or the definition, that is spelled out in NFPA 72. But what is the reason to start with? My first assumption is that it is used because most fire alarm companies do not have the expertise or capabilities to determine if components (relays, etc.) are compatible with the control equipment and also that they meet the basic requirements spelled out in NFPA 72.