30 CFR §7.309
Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
Each approved motor assembly shall be identified by a legible and permanent approval plate inscribed with the assigned MSHA approval number and a warning statement as specified in § 7.306(d) of this part. The plate shall be securely attached to the motor assembly in a manner that does not impair any explosion-proof characteristics.