120 VAC Smoke Detectors (NEC Article 760)
120 VAC Smoke Detectors (NEC Article 760)
Branch circuits supplying power to single and multiple-station smoke alarms such as those in dwelling units are not subject to the requirements of article 760. Therefore listed for purpose smoke detection matched to a fire alarm panel and it's listing might fall under an exception not contemplated. UL circuit directory and FM Directory in its listing may offer the identical comment in your follow up consideration reply.
Since the OP (PLFA) also is centered around enclosures and conductor types try looking at 760.3, 760.121, 760.139, 760.179 then go back to 760.135 (E) to determine if those satisfy your OP with concerns about the detection and the fire alarm panel. It is entirely possible the smoke detectors are UR and not UL or that some detectors in your SLC may be incorporated with 770.113 (B) and those are used for a smoke control system which could have 120VAC with damper controls as a cause and effect matrix.