46 C.F.R. § 113.20-3 Connection boxes.
Title 46 - Shipping
Each connection box and each switch enclosure in an automatic sprinkler system must be constructed in accordance with NEMA 250 Type 4 or 4X or IEC IP 56 requirements. [CGD 94–108, 61 FR 28288, June 4, 1996, as amended at 62 FR 23910, May 1, 1997]
Title 46: Shipping
PART 113—COMMUNICATION AND ALARM SYSTEMS AND EQUIPMENT
Subpart 113.20—Automatic Sprinkler Systems
§ 113.20-3 Connection boxes.
