Spaces required to have fire detection systems.

(a) The following spaces must be equipped with a fire detection and alarm system of an approved type installed in accordance with 46 CFR part 76, except when a fixed-gas fire extinguishing system that is capable of automatic discharge upon heat detection is installed or when the space is manned: (1) A space containing propulsion machinery. (2) A space containing an internal combustion engine of more than 50 hp. (3) A space containing an oil-fired boiler. (4) A space containing machinery powered by gasoline or any other fuels having a flash point of 43.3 °C (110 °F) or lower. (5) A space containing a fuel tank for gasoline or any other fuel having a flash point of 43.3 °C (110 °F) or lower. (b) [Reserved] (c) Vessels described by 46 CFR 175.110(c) must have an interconnected fire detection system in compliance with § 181.450 installed in all enclosed areas where passengers and crew have routine access, including accommodation spaces and machinery spaces. (d) An enclosed vehicle space must be fitted with a fire detection and alarm system of an approved type that is installed in accordance with part 76 of this chapter. [USCG-2012-0196, 81 FR 48300, July 22, 2016; as amended by USCG-2021-0306, 86 FR 73172, Dec. 27, 2021; USCG-2024-1103, 90 FR 52881, Nov. 24, 2025]