US lawFederal (United States)RegulationsTitle 46 CFR — ShippingChapter I — COAST GUARD, DEPARTMENT OF HOMELAND SECURITYPart 131 — OPERATIONSSubpart H — Markings for Fire Equipment and Emergency Equipment131.84046 C.F.R. § 131.840Emergency lighting.Last amended: 2016Year: 2026Length: 17 wordsOfficial source Cite as 46 C.F.R. § 131.840 (2026)Emergency lighting must be marked with a letter “E” at least 13 millimeters ( 1/2 -inch) high.Previous46 C.F.R. § 131.835Next46 C.F.R. § 131.845