Code of Federal Regulations > Title 30 > Chapter I > Part 23 - PART 23—TELEPHONES AND SIGNALING DEVICES

U.S. Code of Federal Regulations

Regulations most recently checked for updates: Feb 10, 2026

§ 23.1 - Purpose.

§ 23.2 - Definitions.

§ 23.3 - Application procedures and requirements.

§ 23.4 - [Reserved]

§ 23.5 - Conditions governing investigations.

§ 23.6 - General requirements for approval.

§ 23.7 - Specific requirements for approval.

§ 23.8 - Inspection and tests.

§ 23.9 - Special requirements for complete devices.

§ 23.10 - Material required for MSHA records.

§ 23.11 - How approvals are granted.

§ 23.12 - Wording, purpose, and use of approval plate.

§ 23.13 - Withdrawal of approval.

§ 23.14 - Instructions for handling future changes in design.