Connection boxes.

Each connection box and each switch enclosure in an automatic sprinkler system must be constructed in accordance with Type 4 or 4X of NEMA 250 or IP 56 of IEC 60529:2013 (both incorporated by reference; see 46 CFR 110.10-1) requirements. [USCG-2003-16630, 73 FR 65201, Oct. 31, 2008, as amended by USCG-2020-0075, 88 FR 16369, Mar. 16, 2023]