CFR › Title 46 › Part 111 › §111.55-146 CFR §111.55-1Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗Copy link(a)Each switch must meet Article 404 of NFPA 70 (incorporated by reference; see “§ 110.10-1 of this subchapter).(b)Each switch that is in the weather must be in a watertight enclosure and be externally operable.