29 CFR §1926.431
Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
The employer shall ensure that all wiring components and utilization equipment in hazardous locations are maintained in a dust-tight, dust-ignition-proof, or explosion-proof condition, as appropriate. There shall be no loose or missing screws, gaskets, threaded connections, seals, or other impairments to a tight condition.