StacksVerified U.S. regulatory reference

30 CFR §18.14

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
An enclosure that meets all applicable requirements of this part, but has not been certified by MSHA, shall be identified by a permanent marking on it in a conspicuous location. The design of such marking shall consist of capital letters USMSHA not less than 1/4 inch in height, enclosed in a circle not less than 1 inch in diameter.