46 CFR § 113.20-3
Connection boxes
April 15, 2021
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 (both incorporated by reference; see 46 CFR 110.10-1) requirements.
[USCG-2003-16630, 73 FR 65201, Oct. 31, 2008]
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