StacksVerified U.S. regulatory reference

46 CFR §113.20-3

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
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.